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When is the best time to visit San Francisco?
In general the best time to visit San Francisco is probably September, when the weather is usually great. The hottest months are July, August, September, while the coldest months are January, February, December.
Depending on the activities you want to experience, you may choose different months to visit:
- In general, it’s pleasant to walk and do outdoor activities during April - October.
- If you want to avoid wet weather, then your choice is January, July, August with the lowest chance of rain.
Average weather in San Francisco in different months
This is the average weather in San Francisco for each month based on historic data:
April, May, June, July, August, September, October usually has good weather. Average maximum temperature reaches +75°F during August.
In January, February, March, November, December the weather is average. Expect around 58 rainy days, and the precipitation amounts to approximately 117 mm in December.
Climate in San Francisco
Here is the detailed breakdown of the climate in San Francisco for each month:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Temperature | |||||||||||
| +75°F | +75°F | +79°F | +86°F | +91°F | +97°F | +95°F | +93°F | +99°F | +95°F | +81°F | +73°F |
| Average Maximum Temperature | |||||||||||
| +57°F | +61°F | +63°F | +66°F | +68°F | +73°F | +73°F | +75°F | +75°F | +72°F | +63°F | +57°F |
| Minimum Temperature | |||||||||||
| +30°F | +30°F | +36°F | +39°F | +45°F | +46°F | +50°F | +50°F | +48°F | +43°F | +36°F | +25°F |
| Avg. water temperature | |||||||||||
| +56°F | +56°F | +58°F | +56°F | +56°F | +56°F | +58°F | +59°F | +59°F | +59°F | +57°F | +56°F |
| Humidity, % | |||||||||||
| 82 | 80 | 80 | 78 | 79 | 79 | 82 | 83 | 81 | 79 | 80 | 81 |
| Rain, mm | |||||||||||
| 113 | 108 | 89 | 36 | 16 | 3 | 0 | 1 | 4 | 29 | 63 | 117 |
| Snow, mm | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Average wind speed, m/s | |||||||||||
| 2 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 |
| Sunny Days | |||||||||||
| 5 | 5 | 5 | 8 | 9 | 11 | 7 | 6 | 9 | 10 | 7 | 6 |
| Cloud Days | |||||||||||
| 14 | 12 | 14 | 14 | 17 | 17 | 23 | 24 | 19 | 16 | 13 | 12 |
| Rainy Days | |||||||||||
| 13 | 11 | 12 | 8 | 4 | 1 | 0 | 0 | 2 | 5 | 10 | 12 |
| Snowy Days | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Average Temperature
Here are the average maximum and minimum temperatures in San Francisco during the whole year:
The hottest month in San Francisco is September with average maximum temperature going up to +75°F. The coldest month is January with the lowest temperatures of +45°F.
Water temperature
Here are the water temperatures in San Francisco during the whole year:
San Francisco achieves its warmest water temperature in September, where the average sea temperature goes up to +57°F in average. Coldest water temperature is in June with +52°F in average.
Humidity
The temperature feels different depending on humidity. Here is how humidity in San Francisco looks throughout the year, in %:
The most humid month in San Francisco is August with average humidity going up to 83%. The least humid month is April with an average humidity of 78%.
Rain
Amount of rainfall in mm. in San Francisco during the whole year based on historical data:
The sunniest and driest month is June with approximately 11 sunny days and a total precipitation of around 3 mm. The rainiest and wettest month is December with approximately 12 rainy days and 117 mm of total precipitation.
FAQ
Frequently asked questions about the weather in San Francisco:
What is the hottest month in San Francisco?
The hottest month in San Francisco is September with average maximum temperature of +75°F.
What is the coldest month in San Francisco?
The coldest month in San Francisco is January with minimum temperatures of +45°F.
Is San Francisco worth visiting in winter?
Winter in San Francisco could be a good time to visit, as the weather is generally ok.
When does it rain the least in San Francisco?
if you're looking to visit San Francisco when it rains the least, you should plan your trip for December, January, February. During this time, rainfall is rare with the driest month being July with only 0 mm of rain.
Other cities in USA
Check out the weather for other cities in USA.
Monthly weather in San Francisco
Source of the data
For this page, we’ve looked at the typical weather in San Francisco, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.