April is one of the cooler months of the year in San Francisco, with average highs near 17.2°C and lows around 8.4°C (mean 12.8°C). It is one of the drier months, averaging 36 mm of rainfall and 79% relative humidity across the period.
April is one of the cooler months of the year in San Francisco. Across 45 years of records, the warmest April in San Francisco was 1992 — when the month averaged 14.6°C — while the coldest was 2003 at 10.8°C. Typical April days reach 17.2°C with nights near 8.4°C. The long-term April temperature trend is broadly flat.
April is one of the drier months in San Francisco, averaging 36 mm of rainfall. The wettest April on record was 2006 with 136 mm, while the driest were 2008 and 2021 at 3 mm.
Relative humidity in San Francisco during April averages 79%. The most humid April was 2006 at 85%, and the least humid was 1987 at 74%.
April receives about 6 kWh/m²/day of solar energy in San Francisco. The sunniest April was 2022 at 6.8 kWh/m²/day, and the cloudiest was 2006 at 4.7.
Average wind speed in San Francisco during April is 2.4 m/s. The windiest April was 2022 at 2.9 m/s, while the calmest was 1989 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.8°C | 12.8°C | 12.2°C | 13.1°C | 13.2°C | +0.4°C |
| Avg High | 17.3°C | 17.3°C | 16.4°C | 17.4°C | 17.8°C | +0.5°C |
| Avg Low | 8.2°C | 8.4°C | 7.9°C | 8.8°C | 8.5°C | +0.3°C |
| Avg Rain | 36 mm | 34 mm | 43 mm | 42 mm | 18 mm | -18 mm |
April temperatures in San Francisco have risen by about 0.7°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 1.9°C (1999) to a record high of 29.6°C (2014).
Rainfall in April is one of the drier months, averaging 36 mm, with a wettest year of 136 mm.
A good time to visit San Francisco
April is a good time to visit San Francisco, with days averaging 17.2°C and nights around 8.4°C (mean 12.8°C, cooler than San Francisco's yearly average) and moderate rainfall. September and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.8°C | 13.4°C | 9.0°C | 23.0°C | 6.5°C | 9 mm | 82% | 2.2 m/s | 5.6 |
| 2024 | 17.9°C | 13.4°C | 8.9°C | 23.2°C | 4.9°C | 33 mm | 81% | 2.5 m/s | 6.2 |
| 2023 | 16.5°C | 12.0°C | 7.4°C | 24.3°C | 3.5°C | 6 mm | 80% | 2.6 m/s | 6.6 |
| 2022 | 17.8°C | 13.0°C | 8.2°C | 28.1°C | 5.4°C | 31 mm | 75% | 2.9 m/s | 6.8 |
| 2021 | 18.4°C | 13.3°C | 8.2°C | 26.1°C | 6.3°C | 3 mm | 74% | 2.6 m/s | 6.2 |
| 2020 | 18.6°C | 14.0°C | 9.4°C | 25.6°C | 6.3°C | 29 mm | 76% | 2.5 m/s | 5.7 |
| 2019 | 18.4°C | 14.3°C | 10.2°C | 26.3°C | 7.8°C | 14 mm | 83% | 2.3 m/s | 5.7 |
| 2018 | 17.3°C | 12.9°C | 8.5°C | 24.8°C | 5.3°C | 67 mm | 80% | 2.5 m/s | 6 |
| 2017 | 17.0°C | 13.1°C | 9.2°C | 22.6°C | 6.0°C | 69 mm | 82% | 2.4 m/s | 5.8 |
| 2016 | 18.5°C | 14.2°C | 10.0°C | 25.0°C | 7.0°C | 32 mm | 78% | 2.4 m/s | 6.1 |
| 2015 | 17.8°C | 13.3°C | 8.7°C | 27.6°C | 6.5°C | 31 mm | 77% | 2.5 m/s | 6.4 |
| 2014 | 18.5°C | 13.8°C | 9.2°C | 29.6°C | 6.3°C | 35 mm | 79% | 2.3 m/s | 6.1 |
| 2013 | 18.8°C | 13.8°C | 8.8°C | 25.5°C | 5.3°C | 19 mm | 74% | 2.4 m/s | 6.5 |
| 2012 | 16.8°C | 12.6°C | 8.4°C | 27.6°C | 3.4°C | 51 mm | 82% | 2.4 m/s | 6 |
| 2011 | 15.3°C | 11.4°C | 7.5°C | 23.1°C | 3.5°C | 9 mm | 81% | 2.7 m/s | 6.1 |
| 2010 | 15.2°C | 11.3°C | 7.4°C | 21.7°C | 5.1°C | 94 mm | 81% | 2.6 m/s | 5.8 |
| 2009 | 17.1°C | 12.3°C | 7.4°C | 28.8°C | 4.0°C | 17 mm | 76% | 2.6 m/s | 6.4 |
| 2008 | 16.5°C | 11.6°C | 6.7°C | 25.7°C | 3.1°C | 3 mm | 76% | 2.5 m/s | 6.7 |
| 2007 | 17.4°C | 12.6°C | 7.9°C | 26.8°C | 5.4°C | 38 mm | 78% | 2.5 m/s | 6.2 |
| 2006 🌧️ | 15.7°C | 12.3°C | 9.0°C | 21.6°C | 5.5°C | 136 mm | 85% | 2.2 m/s | 4.7 |
| 2005 | 16.2°C | 12.0°C | 7.9°C | 21.5°C | 4.6°C | 43 mm | 81% | 2.4 m/s | 6.3 |
| 2004 | 18.3°C | 13.6°C | 8.9°C | 28.9°C | 6.2°C | 8 mm | 78% | 2.2 m/s | 6.2 |
| 2003 ❄️ | 14.2°C | 10.8°C | 7.4°C | 19.3°C | 4.0°C | 98 mm | 83% | 2.5 m/s | 5.6 |
| 2002 | 16.3°C | 12.3°C | 8.3°C | 23.2°C | 4.6°C | 11 mm | 82% | 2.2 m/s | 5.4 |
| 2001 | 15.4°C | 11.2°C | 6.9°C | 24.4°C | 3.7°C | 32 mm | 80% | 2.5 m/s | 6.1 |
| 2000 | 17.1°C | 13.0°C | 8.8°C | 24.4°C | 6.2°C | 42 mm | 82% | 2.3 m/s | 5.9 |
| 1999 | 16.1°C | 11.5°C | 6.9°C | 25.1°C | 1.9°C | 47 mm | 77% | 2.8 m/s | 6.1 |
| 1998 | 15.9°C | 11.9°C | 8.0°C | 24.6°C | 4.9°C | 49 mm | 82% | 2.4 m/s | 5.9 |
| 1997 | 17.8°C | 13.0°C | 8.3°C | 22.8°C | 4.7°C | 13 mm | 78% | 2.5 m/s | 6.2 |
| 1996 | 18.0°C | 13.5°C | 9.0°C | 25.7°C | 6.5°C | 61 mm | 81% | 2.2 m/s | 6.2 |
| 1995 | 15.9°C | 11.9°C | 7.9°C | 21.7°C | 4.2°C | 59 mm | 83% | 2.6 m/s | 5.8 |
| 1994 | 17.5°C | 12.9°C | 8.4°C | 21.9°C | 5.8°C | 40 mm | 80% | 2.3 m/s | 5.8 |
| 1993 | 16.8°C | 12.7°C | 8.7°C | 22.1°C | 5.8°C | 23 mm | 82% | 2.3 m/s | 6.4 |
| 1992 🔥 | 19.1°C | 14.6°C | 10.0°C | 25.5°C | 5.9°C | 22 mm | 80% | 2.3 m/s | 6 |
| 1991 | 16.2°C | 11.7°C | 7.3°C | 21.4°C | 4.7°C | 15 mm | 78% | 2.5 m/s | 6.3 |
| 1990 | 19.2°C | 14.4°C | 9.6°C | 25.3°C | 6.7°C | 10 mm | 76% | 2.3 m/s | 5.7 |
| 1989 | 18.6°C | 14.1°C | 9.5°C | 25.7°C | 6.5°C | 21 mm | 78% | 1.8 m/s | 5.8 |
| 1988 | 17.5°C | 12.9°C | 8.4°C | 26.8°C | 6.6°C | 48 mm | 76% | 2.2 m/s | 5.6 |
| 1987 | 19.4°C | 14.1°C | 8.8°C | 25.4°C | 6.2°C | 6 mm | 74% | 2.2 m/s | 6.1 |
| 1986 | 16.7°C | 12.3°C | 7.9°C | 24.2°C | 4.6°C | 20 mm | 79% | 2.4 m/s | 6 |
| 1985 | 18.7°C | 13.7°C | 8.6°C | 24.9°C | 6.4°C | 6 mm | 78% | 2.1 m/s | 5.7 |
| 1984 | 16.0°C | 11.5°C | 7.0°C | 25.0°C | 4.1°C | 25 mm | 78% | 2.6 m/s | 6.3 |
| 1983 | 15.0°C | 11.5°C | 8.1°C | 18.4°C | 4.7°C | 95 mm | 80% | 2.5 m/s | — |
| 1982 | 15.7°C | 11.5°C | 7.4°C | 22.1°C | 4.5°C | 89 mm | 80% | 2.7 m/s | — |
| 1981 | 18.3°C | 13.2°C | 8.0°C | 29.5°C | 4.6°C | 12 mm | 77% | 2.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 17.2°C with lows near 8.4°C (mean 12.8°C), based on 45 years of NASA POWER data.
April averages 36 mm of rainfall in San Francisco, one of the drier months. The wettest on record was 136 mm in 2006.
The hottest April reached 29.6°C in 2014. The coldest dipped to 1.9°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.7°C. Daytime highs moved from 16.7°C to 17.7°C and overnight lows from 7.8°C to 8.3°C over the same span.
April is one of the cooler months of the year in San Francisco and one of the drier months, so plan for around 17.2°C daytime highs and 8.4°C at night.
Not quite — April is the 5th coolest month in San Francisco, averaging 12.8°C.
For April in San Francisco, pack light layers you can adjust through the day, with typical highs of 17.2°C and lows of 8.4°C.
Relative humidity in April averages 79% — quite humid.
Average wind speed in April is 2.4 m/s. The windiest April on record averaged 2.9 m/s (2022).
The wettest April on record was 2006 with 136 mm. On average, April sees 36 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Francisco behaves each April, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for April specifically, along with year-by-year records and how the month has changed over the decades.
