Weather in Portola Valley

+13 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 93%

Cloudiness: 73%

Visibility: 68%

morning6:00 Cloudy

+13 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 95%

Cloudiness: 80%

Visibility: 100%

+18 °CCloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 29 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 76%

Cloudiness: 77%

Visibility: 100%

afternoon12:00 Cloudy

+21 °CCloudy southwest

Wind: gentle breeze, southwest

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 66%

Cloudiness: 64%

Visibility: 100%

+20 °CVariably cloudy southwest

Wind: gentle breeze, southwest

speed: 14 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 63%

Cloudiness: 50%

Visibility: 100%

evening18:00 Cloudy

+17 °CCloudy western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 79%

Cloudiness: 58%

Visibility: 100%

+15 °CCloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 32 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 90%

Cloudiness: 63%

Visibility: 70%

Sunrise 06:12, Sunset 20:18, Ultraviolet index: 9,7 (Very high), more ...

Moonrise 12:11, Moonset 23:19, Moon phase: waxing crescent

Geomagnetic Field: Active

Thursday, July 31, 2025

night0:00 Cloudy

+14 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 95%

Cloudiness: 63%

Visibility: 91%

+14 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 96%

Cloudiness: 78%

Visibility: 100%

morning6:00 Cloudy

+13 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 98%

Cloudiness: 84%

Visibility: 86%

+18 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 81%

Cloudiness: 83%

Visibility: 100%

afternoon12:00 Variably cloudy

+22 °CVariably cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 29 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 69%

Cloudiness: 73%

Visibility: 100%

+21 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 63%

Cloudiness: 19%

Visibility: 100%

evening18:00 Partly cloudy

+17 °CPartly cloudy western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 79%

Cloudiness: 36%

Visibility: 100%

+16 °CVariably cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 29 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 92%

Cloudiness: 63%

Visibility: 41%

Sunrise 06:13, Sunset 20:17, Ultraviolet index: 9,9 (Very high), more ...

Moonrise 13:10, Moonset 23:44, Moon phase: waxing crescent

Geomagnetic Field: Unstable

Friday, August 1, 2025

night0:00 Cloudy

+14 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 25 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 98%

Cloudiness: 61%

Visibility: 89%

+14 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 96%

Cloudiness: 68%

Visibility: 93%

morning6:00 Cloudy

+13 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 97%

Cloudiness: 70%

Visibility: 100%

+18 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 82%

Cloudiness: 67%

Visibility: 100%

afternoon12:00 Partly cloudy

+22 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 29 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 68%

Cloudiness: 51%

Visibility: 100%

+23 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 63%

Cloudiness: 14%

Visibility: 100%

evening18:00 Clear

+18 °CClear southwest

Wind: gentle breeze, southwest

speed: 14 km/h

Wind gusts: 47 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 74%

Cloudiness: 0%

Visibility: 100%

+16 °CClear southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 50 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 88%

Cloudiness: 19%

Visibility: 98%

Sunrise 06:14, Sunset 20:16, Ultraviolet index: 9,9 (Very high), more ...

Moonrise 14:11, Moonset --:--, Moon phase: in its first quarter

Geomagnetic Field: Quiet

Saturday, August 2, 2025

night0:00 Partly cloudy

+14 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 47 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 94%

Cloudiness: 44%

Visibility: 58%

+14 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 97%

Cloudiness: 57%

Visibility: 98%

morning6:00 Cloudy

+13 °CCloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 32 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 96%

Cloudiness: 59%

Visibility: 98%

+19 °CVariably cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 32 km/h

Atmospheric pressure: 1004 hPa

Relative humidity: 78%

Cloudiness: 55%

Visibility: 100%

afternoon12:00 Clear

+23 °CClear western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 32 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 63%

Cloudiness: 22%

Visibility: 100%

+24 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 1003 hPa

Relative humidity: 58%

Cloudiness: 0%

Visibility: 100%

evening18:00 Clear

+19 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 43 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 71%

Cloudiness: 2%

Visibility: 100%

+16 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 47 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 85%

Cloudiness: 14%

Visibility: 100%

Sunrise 06:15, Sunset 20:15, Ultraviolet index: 10,4 (Very high), more ...

Moonrise 15:12, Moonset 00:13, Moon phase: waxing gibbous

Geomagnetic Field: Quiet

Sunday, August 3, 2025

night0:00 Partly cloudy

+14 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 43 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 92%

Cloudiness: 29%

Visibility: 100%

+13 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 93%

Cloudiness: 34%

Visibility: 100%

morning6:00 Clear

+14 °CClear southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 47 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 85%

Cloudiness: 28%

Visibility: 100%

+19 °CClear southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 58 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 72%

Cloudiness: 15%

Visibility: 100%

afternoon12:00 Partly cloudy

+21 °CPartly cloudy western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 72 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 64%

Cloudiness: 21%

Visibility: 100%

+22 °CClear western

Wind: gentle breeze, western

speed: 18 km/h

Wind gusts: 79 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 60%

Cloudiness: 17%

Visibility: 100%

evening18:00 Clear

+18 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 83 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 66%

Cloudiness: 0%

Visibility: 100%

+15 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 76 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 74%

Cloudiness: 19%

Visibility: 100%

Sunrise 06:16, Sunset 20:14, Ultraviolet index: 10,1 (Very high), more ...

Moonrise 16:13, Moonset 00:46, Moon phase: waxing gibbous

Geomagnetic Field: Active

Monday, August 4, 2025

night0:00 Partly cloudy

+14 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 68 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 77%

Cloudiness: 29%

Visibility: 100%

+13 °CVariably cloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 68 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 84%

Cloudiness: 61%

Visibility: 100%

morning6:00 Cloudy

+14 °CCloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 61 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 87%

Cloudiness: 75%

Visibility: 96%

+17 °CCloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 54 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 74%

Cloudiness: 75%

Visibility: 100%

afternoon12:00 Clear

+21 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 62%

Cloudiness: 58%

Visibility: 100%

+22 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 58%

Cloudiness: 3%

Visibility: 100%

evening18:00 Clear

+17 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 66%

Cloudiness: 0%

Visibility: 93%

+15 °CClear southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 43 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 79%

Cloudiness: 31%

Visibility: 68%

Sunrise 06:16, Sunset 20:13, more ...

Moonrise 17:12, Moonset 01:26, Moon phase: waxing gibbous

Geomagnetic Field: Active

Tuesday, August 5, 2025

night0:00 Clear

+13 °CClear southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 87%

Cloudiness: 43%

Visibility: 55%

+13 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 32 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 91%

Cloudiness: 34%

Visibility: 54%

morning6:00 Partly cloudy

+14 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 25 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 87%

Cloudiness: 23%

Visibility: 100%

+20 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 22 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 70%

Cloudiness: 19%

Visibility: 96%

afternoon12:00 Clear

+24 °CClear southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 29 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 59%

Cloudiness: 20%

Visibility: 95%

+25 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 36 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 56%

Cloudiness: 11%

Visibility: 95%

evening18:00 Clear

+20 °CClear western

Wind: gentle breeze, western

speed: 14 km/h

Wind gusts: 50 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 67%

Cloudiness: 0%

Visibility: 95%

+17 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 11 km/h

Wind gusts: 54 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 83%

Cloudiness: 11%

Visibility: 100%

Sunrise 06:17, Sunset 20:12, more ...

Moonrise 18:07, Moonset 02:15, Moon phase: waxing gibbous

Geomagnetic Field: Unstable

Wednesday, August 6, 2025

night0:00 Partly cloudy

+15 °CPartly cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 50 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 91%

Cloudiness: 18%

Visibility: 100%

+15 °CVariably cloudy southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 47 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 94%

Cloudiness: 69%

Visibility: 100%

morning6:00 Cloudy

+16 °CCloudy western

Wind: light breeze, western

speed: 7 km/h

Wind gusts: 40 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 90%

Cloudiness: 83%

Visibility: 100%

+21 °CCloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 47 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 78%

Cloudiness: 95%

Visibility: 96%

afternoon12:00 Cloudy

+24 °CCloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 50 km/h

Atmospheric pressure: 1001 hPa

Relative humidity: 70%

Cloudiness: 100%

Visibility: 95%

+25 °CCloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 43 km/h

Atmospheric pressure: 1000 hPa

Relative humidity: 74%

Cloudiness: 100%

Visibility: 95%

evening18:00 Clear

+20 °CClear western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 43 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 48%

Cloudiness: 100%

Visibility: 95%

+16 °CClear southwest

Wind: light breeze, southwest

speed: 7 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 70%

Cloudiness: 2%

Visibility: 95%

Sunrise 06:18, Sunset 20:11, more ...

Moonrise 18:55, Moonset 03:12, Moon phase: waxing gibbous

Geomagnetic Field: Minor Storm

Thursday, August 7, 2025

night0:00 Clear

+14 °CClear southwest

Wind: light breeze, southwest

speed: 7 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 70%

Cloudiness: 0%

Visibility: 100%

+13 °CClear southwest

Wind: light breeze, southwest

speed: 7 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 76%

Cloudiness: 1%

Visibility: 100%

morning6:00 Clear

+16 °CClear southern

Wind: light breeze, southern

speed: 7 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 64%

Cloudiness: 1%

Visibility: 100%

+23 °CClear southwest

Wind: light breeze, southwest

speed: 7 km/h

Wind gusts: 11 km/h

Atmospheric pressure: 999 hPa

Relative humidity: 45%

Cloudiness: 1%

Visibility: 96%

afternoon12:00 Variably cloudy

+26 °CVariably cloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 14 km/h

Atmospheric pressure: 997 hPa

Relative humidity: 37%

Cloudiness: 57%

Visibility: 95%

+24 °CPartly cloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 14 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 42%

Cloudiness: 84%

Visibility: 95%

evening18:00 Partly cloudy

+18 °CPartly cloudy western

Wind: light breeze, western

speed: 11 km/h

Wind gusts: 14 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 75%

Cloudiness: 38%

Visibility: 62%

+15 °CVariably cloudy western

Wind: light breeze, western

speed: 7 km/h

Wind gusts: 14 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 92%

Cloudiness: 56%

Visibility: 38%

Sunrise 06:19, Sunset 20:10, more ...

Moonrise 19:36, Moonset 04:16, Moon phase: waxing gibbous

Geomagnetic Field: Minor Storm

Friday, August 8, 2025

night0:00 Cloudy

+14 °CCloudy western

Wind: light breeze, western

speed: 7 km/h

Wind gusts: 11 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 94%

Cloudiness: 73%

Visibility: 36%

Wind: light breeze, western

speed: 7 km/h

Wind gusts: 11 km/h

Atmospheric pressure: 995 hPa

Relative humidity: 95%

Cloudiness: 77%

Visibility: 39%

morning6:00 Partly cloudy

+15 °CPartly cloudy western

Wind: light breeze, western

speed: 7 km/h

Atmospheric pressure: 995 hPa

Relative humidity: 89%

Cloudiness: 60%

Visibility: 60%

+21 °CPartly cloudy western

Wind: light breeze, western

speed: 11 km/h

Atmospheric pressure: 995 hPa

Relative humidity: 67%

Cloudiness: 40%

Visibility: 96%

afternoon12:00 Variably cloudy

+24 °CVariably cloudy western

Wind: light breeze, western

speed: 11 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 54%

Cloudiness: 64%

Visibility: 95%

+22 °CCloudy western

Wind: gentle breeze, western

speed: 14 km/h

Atmospheric pressure: 992 hPa

Relative humidity: 60%

Cloudiness: 94%

Visibility: 95%

evening18:00 Cloudy

+17 °CCloudy western

Wind: gentle breeze, western

speed: 14 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 80%

Cloudiness: 100%

Visibility: 100%

Wind: light breeze, western

speed: 7 km/h

Wind gusts: 11 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 91%

Cloudiness: 83%

Visibility: 71%

Sunrise 06:20, Sunset 20:09, more ...

Moonrise 20:11, Moonset 05:24, Moon phase: full full

Geomagnetic Field: Minor Storm

Saturday, August 9, 2025

night0:00 Partly cloudy

+13 °CPartly cloudy western

Wind: light breeze, western

speed: 7 km/h

Atmospheric pressure: 992 hPa

Relative humidity: 94%

Cloudiness: 32%

Visibility: 56%

+13 °CPartly cloudy western

Wind: light breeze, western

speed: 7 km/h

Atmospheric pressure: 992 hPa

Relative humidity: 94%

Cloudiness: 33%

Visibility: 57%

morning6:00 Partly cloudy

Wind: light breeze, western

speed: 7 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 87%

Cloudiness: 32%

Visibility: 63%

+20 °CClear western

Wind: light breeze, western

speed: 7 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 65%

Cloudiness: 15%

Visibility: 100%

afternoon12:00 Clear

+23 °CClear western

Wind: light breeze, western

speed: 11 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 52%

Cloudiness: 3%

Visibility: 97%

+22 °CVariably cloudy western

Wind: light breeze, western

speed: 11 km/h

Atmospheric pressure: 992 hPa

Relative humidity: 56%

Cloudiness: 63%

Visibility: 96%

evening18:00 Partly cloudy

+17 °CPartly cloudy western

Wind: light breeze, western

speed: 11 km/h

Atmospheric pressure: 993 hPa

Relative humidity: 78%

Cloudiness: 93%

Visibility: 100%

Wind: light breeze, western

speed: 7 km/h

Atmospheric pressure: 995 hPa

Relative humidity: 91%

Cloudiness: 36%

Visibility: 71%

Sunrise 06:21, Sunset 20:08, more ...

Moonrise 20:42, Moonset 06:34, Moon phase: waning gibbous

Geomagnetic Field: Minor Storm

Sunday, August 10, 2025

night0:00 Partly cloudy

+13 °CPartly cloudy southwest

Wind: light air, southwest

speed: 4 km/h

Atmospheric pressure: 995 hPa

Relative humidity: 93%

Cloudiness: 31%

Visibility: 56%

+13 °CClear southwest

Wind: light air, southwest

speed: 4 km/h

Atmospheric pressure: 995 hPa

Relative humidity: 92%

Cloudiness: 37%

Visibility: 57%

morning6:00 Clear

+15 °CClear southwest

Wind: light air, southwest

speed: 4 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 82%

Cloudiness: 9%

Visibility: 91%

+21 °CClear western

Wind: light air, western

speed: 4 km/h

Wind gusts: 7 km/h

Atmospheric pressure: 996 hPa

Relative humidity: 58%

Cloudiness: 2%

Visibility: 96%

Sunrise 06:22, Sunset 20:07, more ...

Moonrise 21:08, Moonset 07:44, Moon phase: waning gibbous