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San Francisco in April: weather, sea & travel advice
This month's data profile
Clear transition month
San Francisco in April is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 17 °C, and the sea is about 11 °C. With about 6 rainy days it is dry.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
61/100 · #7
Warmth
#8
Dryness
#7
Sun
#5
Sea warmth
#12
Published best categories: none
San Francisco · AprilPhoto: Dale Cruse · CC BY 2.0Climate facts
- Average high
- 17 °C
- Average low
- 8 °C
- Sea
- 11 °C
- Rainy days (est.)
- 6 rainy days (est.)
- Sun (est.)
- 8 h/day
- Humidity
- 80 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| March | 16 | 8 | 10 | 85 | 5.7 | 82 | 2.3 | 12 | 48 |
| April (selected) | 17 | 8 | 6 | 37 | 7.7 | 80 | 2.4 | 11 | 61 |
| May | 19 | 10 | 3 | 20 | 9.0 | 78 | 2.5 | 12 | 68 |
How do the previous and next months compare?
Baseline: April (61/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| March | -13 | -1.5 °C | -0.6 °C | +4.7 | +48.7 mm | -2 h | +2.2 % | -0.1 m/s | +0.5 °C |
| May | +7 | +2.1 °C | +1.5 °C | -2.2 | -16.4 mm | +1.3 h | -2 % | ±0 m/s | +0.2 °C |
All twelve months in context
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Frequently asked questions
How warm is San Francisco in April?
The average daily high is around 17 °C, with an average daily low of about 8 °C.
Can you swim in San Francisco in April?
The sea is about 11 °C (cold).
Does it rain a lot in San Francisco in April?
The curated estimate is about 6 rainy days per month, not a directly measured long-term average. Total precipitation averages around 37 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Francisco?
By the climate score, July, August, September and October are the strongest months for San Francisco. For a beach trip: July, August and September. April is not among them.