Climate of Portola Valley
Portola Valley has a mediterranean climate. The summers are warm and dry, and the temperature is cold in the winter. The average annual temperature for Portola Valley is 18° degrees and there is about 107 mm of rain in a year. It is dry for 278 days a year with an average humidity of 73% and an UV-index of 4.
Climate averages for the whole year
- Day: the average daily temperature during the day is between 13°C and 22°C
- Night:the average nighttime temperature is between 8°C and 14°C
- Rain: it rains 55 days and there is a total of approximately 107 mm rainfall
- Sun hours: throughout the year there are 3326 sun hours
Maximum temperature: | between 13°C and 22°C |
Warmest month: | 22°C in July |
Coldest month: | 13°C in December |
Night temperature: | between 8°C and 14°C |
Dry days: | 310 days |
Days with rain: | 55 days |
Days with snow: | 0 days |
Total rain sum: | 107 mm |
Hours of sunshine: | 3326 hours |
Temperature graph
This graph shows the average maximum temperature (red) and minimum temperature (blue) for Portola Valley.
Precipitation graph
This graph shows the average amount of rainfall per month for Portola Valley.
Climate table of Portola Valley
In this climate table you can see at a glance what the average weather per month is for Portola Valley. The data has been collected over a 30-year period, from which an average per month has been derived. From year to year the differences may be larger or smaller, but with this climate table you have a good idea of what the weather for Portola Valley might be like in a given month.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Day temp. (°C) | 14 | 14 | 15 | 17 | 18 | 20 | 22 | 22 | 22 | 20 | 16 | 13 |
Night temp. (°C) | 8 | 8 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 13 | 10 | 8 |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
Precipitation (mm) | 17 | 27 | 18 | 5 | 2 | 1 | 2 | 1 | 2 | 4 | 14 | 14 |
Days with rain | 7 | 7 | 10 | 6 | 2 | 1 | 2 | 1 | 2 | 4 | 5 | 8 |
Dry days | 24 | 21 | 21 | 24 | 29 | 29 | 29 | 30 | 28 | 27 | 25 | 23 |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
Sun hours per day | 6 | 6 | 8 | 11 | 11 | 12 | 12 | 12 | 11 | 7 | 7 | 6 |
Wind force (Bft) | 2 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 |
UV-index | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 4 | 4 | 3 |
Best time to visit Portola Valley
The best time to visit Portola Valley in the state of California is from May through October. In this period you have a pleasant temperature and almost no precipitation. The highest average temperature in Portola Valley is 22°C in July and the lowest is 13°C in December.
Climate of Portola Valley by month
What is the average climate in a given month for Portola Valley? Click on a month to see all monthly averages for sunshine, maximum and minimum temperatures, percent chance of rain per day, snowfall and number of rainy days.
Portola Valley weather experiences
Have you been to in Portola Valley?
Leave your Portola Valley weather experience for a chance to win $150!