San Francisco weather in 2023
San Francisco weather in 2023, with 365 daily observations from Open-Meteo archive data.
Interactive graph
Open San Francisco in the interactive graph
Use the graph view to inspect 2023 alongside other available years for San Francisco.
Year summary
In 2023, San Francisco averaged 16.6 C for daily highs and 10.6 C for daily lows.
A 1991-2020 normal is not available for this location yet, so this page compares 2023 with the 2023-2025 archive baseline. The 2023 average daily high was -0.7 C from that baseline, and total precipitation was +143.8 mm from the baseline total.
The warmest month was October, with an average high of 22.2 C, while February had the lowest average low at 5.9 C.
The wettest month was January, totaling 261.2 mm. The hottest day reached 34.7 C on October 6, 2023.
Monthly averages and precipitation
| Month | Avg low C | Avg high C | Rain and snow mm | Days |
|---|---|---|---|---|
| January | 7.5 | 13.1 | 261.2 | 31 |
| February | 5.9 | 12.0 | 88.4 | 28 |
| March | 7.4 | 12.2 | 229.3 | 31 |
| April | 8.7 | 13.8 | 3.7 | 30 |
| May | 11.3 | 15.1 | 31.7 | 31 |
| June | 12.4 | 16.7 | 1.4 | 30 |
| July | 12.8 | 19.5 | 0.0 | 31 |
| August | 14.3 | 21.3 | 0.2 | 31 |
| September | 14.2 | 20.2 | 1.7 | 30 |
| October | 13.0 | 22.2 | 11.2 | 31 |
| November | 9.9 | 17.8 | 78.6 | 30 |
| December | 9.0 | 15.0 | 174.5 | 31 |
Daily records in 2023
| Record | Date | Value |
|---|---|---|
| Hottest day | October 6, 2023 | 34.7 C |
| Coldest night | January 30, 2023 | 3.3 C |
| Wettest day | December 17, 2023 | 47.6 mm |
Related pages
Weather data source: Open-Meteo Archive API. City metadata source: GeoNames cities15000.