Summer temperatures · California
How hot does San Francisco get in summer?
San Francisco right now
55°FBroken cloud
- Today58°F / 55°FClouds
- Tomorrow59°F / 55°FClouds
- Monday61°F / 54°FClear skies
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical summer, June to August, San Francisco averages highs around 73°F and lows around 55°F.
About 4 days a year reach 90°F or hotter, and a day at 100°F comes along less than once a year. About 23 days a year get to 80°F or warmer. That makes it the 5th coolest summer of the 129 US cities we track.
Last updated
A weather alert is in force here, so no joke today. The National Weather Service has the details.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 73°F |
|---|---|
| Average summer low | 55°F |
| Days a year at 80°F or warmer | 23 |
| Days a year at 90°F or hotter | 4 |
| Days a year at 100°F or hotter | fewer than one |
| Average winter high, for comparison | 59°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Flagstaff, Arizona: highs around 80°F, lows around 48°F
- Duluth, Minnesota: highs around 75°F, lows around 54°F
- Great Falls, Montana: highs around 80°F, lows around 49°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00023234.