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Climate of San Francisco
San Francisco has a mediterranean climate. The summers are warm and dry, and the temperature is cold in the winter. The average annual temperature for San Francisco is 17° degrees and there is about 333 mm of rain in a year. It is dry for 258 days a year with an average humidity of 75% 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 21°C
- Night:the average nighttime temperature is between 9°C and 14°C
- Sea temperature: the sea temperature is between 13°C and 15°C
- Rain: it rains 80 days and there is a total of approximately 332 mm rainfall
- Sun hours: throughout the year there are 3184 sun hours
| Maximum temperature: | between 13°C and 21°C |
| Warmest month: | 21°C in September |
| Coldest month: | 13°C in January |
| Night temperature: | between 9°C and 14°C |
| Sea temperature: | between 13°C and 15°C |
| Dry days: | 285 days |
| Days with rain: | 80 days |
| Days with snow: | 0 days |
| Total rain sum: | 332 mm |
| Hours of sunshine: | 3184 hours |
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Temperature graph
This graph shows the average maximum temperature (red) and minimum temperature (blue) for San Francisco.
Precipitation graph
This graph shows the average amount of rainfall per month for San Francisco.
Climate table of San Francisco
In this climate table you can see at a glance what the average weather per month is for San Francisco. 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 San Francisco might be like in a given month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day temp. (°C) | 13 | 14 | 15 | 16 | 17 | 19 | 20 | 20 | 21 | 19 | 16 | 13 |
| Night temp. (°C) | 9 | 9 | 9 | 9 | 10 | 12 | 12 | 13 | 14 | 13 | 11 | 9 |
| Water temp. (°C) | 14 | 14 | 14 | 13 | 14 | 14 | 14 | 15 | 15 | 15 | 14 | 14 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Precipitation (mm) | 58 | 78 | 56 | 16 | 7 | 5 | 2 | 2 | 3 | 19 | 39 | 47 |
| Days with rain | 10 | 10 | 12 | 8 | 4 | 3 | 3 | 3 | 3 | 6 | 8 | 10 |
| Dry days | 21 | 18 | 19 | 22 | 27 | 27 | 28 | 28 | 27 | 25 | 22 | 21 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Sun hours per day | 6 | 6 | 8 | 11 | 10 | 11 | 12 | 12 | 11 | 7 | 6 | 6 |
| Wind force (Bft) | 2 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 3 |
| UV-index | 4 | 3 | 4 | 4 | 4 | 5 | 4 | 5 | 5 | 4 | 3 | 3 |
Best time to visit San Francisco
The best time to visit San Francisco in the state of California is from June through October. In this period you have a pleasant temperature and almost no precipitation. The highest average temperature in San Francisco is 21°C in September and the lowest is 13°C in January. The average water temperature is around 14°C.
Climate of San Francisco by month
What is the average climate in a given month for San Francisco? 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.
San Francisco weather experiences
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