San Francisco, CA All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in San Francisco, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 105.9°F (41°C) | September 1, 2017 |
| Record Low | 28°F (-2°C) | December 22, 1990 |
| Lowest High | 37°F (3°C) | December 9, 1972 |
| Highest Low | 75°F (24°C) | September 2, 2017 |
| Highest Mean | 88.5°F (31°C) | September 2, 2017 |
| Lowest Mean | 33.5°F (1°C) | December 9, 1972 |
| Precipitation | ||
| Max in One Calendar Day | 5.54" (140.7 mm) | November 5, 1994 |
| Max in One Month | 14.89" (378.2 mm) | February 1998 |
| Least in One Month | 0.00" (0.0 mm) | July 1977 |
| Max in One Year | 43.78" (1112.0 mm) | 1983 |
| Least in One Year | 5.60" (142.3 mm) | 2013 |
| Period of Record | ||
| Temperature | January 1, 1970 – August 1, 2026 | |
| Precipitation | January 1, 1970 – August 1, 2026 | |
| Snowfall | January 1, 1970 – February 29, 2020 | |
Note: Records compiled from NOAA GHCN-Daily observations at SAN FRANCISCO DWTN. Quality-flagged readings are excluded. Monthly and annual totals require substantially complete reporting for “least” records.
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Frequently Asked Questions
What is the hottest temperature ever recorded in San Francisco, CA?
The all-time record high in San Francisco, CA is 105.9°F (41°C), set on September 1, 2017.
What is the coldest temperature ever recorded in San Francisco, CA?
The all-time record low in San Francisco, CA is 28°F (-2°C), set on December 22, 1990.
What is the most rain San Francisco, CA has ever had in one day?
The most precipitation recorded in one calendar day near San Francisco, CA is 5.54 inches, on November 5, 1994.
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