Weather forecast for 10 daysPortola Valley, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 72°F
- 48°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 9mphWNW 299°
- Humidity: 60%
- UV index: 5
- Sunrise: 7:20 am PDT
- Sunset: 6:27 pm PDT
- details ▼
On Sunday, October 18, a sun-drenched sky is anticipated.
The temperature will vary between a maximum of an agreeable 71.6°F and a minimum of a chilly 48.2°F.
Today's forecasted high will be in line with October's typical peak of 68.2°F.
Sunrise was at 7:20 am and sunset will be at 6:27 pm; the daylight will last for 11h and 8min.
The temperature will vary between a maximum of an agreeable 71.6°F and a minimum of a chilly 48.2°F.
Today's forecasted high will be in line with October's typical peak of 68.2°F.
Sunrise was at 7:20 am and sunset will be at 6:27 pm; the daylight will last for 11h and 8min.
10-day overview
Daily temperatures
Warmest day: today 72°C.
Coldest day: tomorrow 61°C.
Coldest day: tomorrow 61°C.
Chance of precipitation
Highest chance: Wednesday 68%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 72°F
- 48°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 9mphWNW 299°
- Humidity: 60%
- UV index: 5
- Sunrise: 7:20 am PDT
- Sunset: 6:27 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 61°F
- 46°F
Mostly Cloudy
- Precip. probability: 14%
- Precipitation: 0"
- Wind: 11mphWNW 296°
- Humidity: 68%
- UV index: 5
- Sunrise: 7:21 am PDT
- Sunset: 6:26 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 66°F
- 50°F
Cloudy
- Precip. probability: 16%
- Precipitation: 0.16"
- Wind: 6mphNE 35°
- Humidity: 66%
- UV index: 3
- Sunrise: 7:22 am PDT
- Sunset: 6:25 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 63°F
- 50°F
Showers
- Precip. probability: 68%
- Precipitation: 0.16"
- Wind: 5mphENE 58°
- Humidity: 80%
- UV index: 2
- Sunrise: 7:23 am PDT
- Sunset: 6:24 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 63°F
- 50°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 9mphWNW 292°
- Humidity: 82%
- UV index: 4
- Sunrise: 7:23 am PDT
- Sunset: 6:22 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 66°F
- 48°F
Partly Cloudy
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 9mphNNW 340°
- Humidity: 75%
- UV index: 5
- Sunrise: 7:24 am PDT
- Sunset: 6:21 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 70°F
- 48°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 8mphN 5°
- Humidity: 62%
- UV index: 5
- Sunrise: 7:25 am PDT
- Sunset: 6:20 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 68°F
- 48°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 8mphN 0°
- Humidity: 64%
- UV index: 4
- Sunrise: 7:26 am PDT
- Sunset: 6:19 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 66°F
- 46°F
Partly Cloudy
- Precip. probability: 22%
- Precipitation: 0"
- Wind: 9mphNNW 333°
- Humidity: 66%
- UV index: 4
- Sunrise: 7:27 am PDT
- Sunset: 6:17 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 66°F
- 46°F
Mostly Sunny
- Precip. probability: 11%
- Precipitation: 0"
- Wind: 9mphN 350°
- Humidity: 64%
- UV index: 4
- Sunrise: 7:28 am PDT
- Sunset: 6:16 pm PDT
- details ▼
Looking ahead, conditions suggest a period of primarily gloomy and occasionally bright and showery weather is forecasted.
With light precipitation of 0.16", rainfall is anticipated on Tuesday and Wednesday.
In the coming days, the highest temperature will vary between 60.8°F and 71.6°F, while the lowest nightly temperature differences will be negligible, as the minimum temperature is expected to range between 46.4°F and 50°F.
The warmest day is today, with a maximum temperature of 71.6°F; the coldest day will be Monday, with a maximum of 60.8°F.
With light precipitation of 0.16", rainfall is anticipated on Tuesday and Wednesday.
In the coming days, the highest temperature will vary between 60.8°F and 71.6°F, while the lowest nightly temperature differences will be negligible, as the minimum temperature is expected to range between 46.4°F and 50°F.
The warmest day is today, with a maximum temperature of 71.6°F; the coldest day will be Monday, with a maximum of 60.8°F.
Updated: Oct 18, 2026 @ 16:55:48 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, in Portola Valley, sunny skies and pleasant visibility are expected.
Today, the highest temperature will be 71.6°F, while the lowest temperature will be 48.2°F.
The highest temperature will be in line with the average maximum of 68.2°F in October. The lowest temperature today will be relatively lower than the average low temperature.
The highest temperature will be in line with the average maximum of 68.2°F in October. The lowest temperature today will be relatively lower than the average low temperature.
On Sunday, in Portola Valley, sunrise was at 7:20 am and sunset will be at 6:27 pm (PDT).
Today in Portola Valley, the daylight will last for 11h and 8min.
