Heredia, Costa Rica · population 55,923 · 16 weather stations within 200 km · records 1881 to 2025
San Francisco has an average annual daytime high of 25.2°C, based on the 1951 to 1980 baseline. Its warmest month is April, when highs typically reach 27.0°C, and its coldest is January, with overnight lows near 15.5°C.
These figures reflect annual averages, not single-day records. Daily observations are outside this dataset's precision.
Since 1900, San Francisco's average temperature has risen by 0.0°C. Compared to the earliest station records that begin in 1881, warming totals +1.6°C.
20-year smoothed annual temperature reconstructed from station anomalies. Dashed line: 1951–1980 baseline.
Daytime highs sit within a comfortable 15°C to 26°C range.
San Francisco's average annual daytime high is 25.2°C, based on the 1951 to 1980 baseline period. The warmest month is April, with highs averaging 27.0°C, and the coldest is January, with lows averaging 15.5°C.
April is the warmest month in San Francisco, with typical daytime highs of 27.0°C.
2023 is the hottest year on record for San Francisco, running +1.8°C above the 1951 to 1980 baseline.
Yes. Since 1900, San Francisco has warmed by roughly 0.0°C.
January to December typically offers the most comfortable daytime highs, in the 15°C to 26°C range.
Baseline period 1951 to 1980. Monthly averages are the mean of station observations weighted by proximity. Warming trend is the 20-year smoothed anomaly against that baseline.