Monthly climate guide
San Francisco weather in April
April in San Francisco is typically mild, with average daytime highs around 18°C (64°F) and night-time lows near 9°C (48°F). The month usually brings about 35 mm of rain (fairly dry) and is a mix of sun and cloud. Daytime highs are 2°C warmer than March and about the same as May.
What stands out in April
- April brings mid-spring to San Francisco.
- Good walking weather for combining Alcatraz Island and Golden Gate Bridge in one day.
- San Francisco is usually about 2°C cooler than Napa, 60 km away, in April.
Avg high
18°C
64°F
Avg low
9°C
48°F
Rainfall
35 mm
fairly dry
Humidity
79%
relative
Sky
53%
cloud · a mix of sun and cloud
San Francisco weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 14°C / 57°F | 7°C / 44°F | 96 mm | 83% | 59% |
| February | 15°C / 59°F | 7°C / 45°F | 90 mm | 80% | 54% |
| March | 16°C / 60°F | 8°C / 47°F | 98 mm | 82% | 61% |
| April | 18°C / 64°F | 9°C / 48°F | 35 mm | 79% | 53% |
| May | 19°C / 66°F | 10°C / 50°F | 15 mm | 77% | 54% |
| June | 22°C / 72°F | 12°C / 53°F | 9 mm | 73% | 45% |
| July | 22°C / 72°F | 12°C / 54°F | 1 mm | 74% | 56% |
| August | 23°C / 74°F | 13°C / 55°F | 1 mm | 75% | 60% |
| September | 24°C / 76°F | 13°C / 56°F | 4 mm | 71% | 46% |
| October | 23°C / 73°F | 12°C / 54°F | 22 mm | 67% | 41% |
| November | 18°C / 64°F | 9°C / 48°F | 59 mm | 75% | 47% |
| December | 14°C / 57°F | 7°C / 44°F | 95 mm | 79% | 53% |
What to pack for April
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is April a good time to visit San Francisco?
Our San Francisco guide recommends: September to November, when fog is less frequent and temperatures are at their warmest — summer here can be surprisingly cool and foggy.
Bring layers even in summer — Mark Twain's famous (if apocryphal) line about a cold San Francisco summer is closer to true than visitors expect.
Best time to visit San Francisco →Other United States cities in April
Cite or embed this data
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San Francisco weather in April. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/san-francisco/april
<a href="https://weathercompare.eu/weather/usa/san-francisco/april">San Francisco weather in April</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/san-francisco" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="San Francisco weather in April"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/san-francisco/april">San Francisco weather in April</a> – WeatherCompare</p>
San Francisco in April: quick answers
Is April a good time to visit San Francisco?
April is a reasonable time for San Francisco: highs around 18°C and about 35 mm of rain, though not one of the three best months.
How warm is San Francisco in April?
Average highs are about 18°C (64°F) and average lows about 9°C (48°F), based on 10 years of daily data.
Does it rain a lot in San Francisco in April?
San Francisco typically gets around 35 mm of rain in April — fairly dry.
When is the best time to visit San Francisco?
September to November, when fog is less frequent and temperatures are at their warmest — summer here can be surprisingly cool and foggy.
Figures are long-term averages for the area around San Francisco (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.