San Francisco weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Excellent
Best time to visit: April – October
What is the weather like in San Francisco in April?
In April, San Francisco is mild: daytime highs average 17 °C, and nights cool down to about 9 °C. The sea averages 11.4 °C – swimming is only for the hardy. The sun shines for around 9 hours a day. Rain is rare: about 5 days bring 33 mm in total. All in all, April is an excellent month for a holiday in San Francisco.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 13 h 8 min06:36 – 19:44
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 18 km/haverage daily peak
- Cloud cover
- 47 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %91 %
- Sunshineweight 20 %97 %
- Few rainy daysweight 30 %96 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in April
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
San Francisco in April: quick answers
Is San Francisco hot in April?
No. In April, San Francisco is mild: daytime highs average 17 °C and nights drop to about 9 °C.
Can you swim in San Francisco in April?
Only if you don't mind cold water: in April the sea averages just 11.4 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in San Francisco in April?
Rain is rare: about 5 days bring 33 mm in total.
San Francisco month by month
The whole year in San FranciscoAll destinations: USAWhere to go in AprilSea temperature in April
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)