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San Diego in April: weather, sea & travel advice
This month's data profile
Strong month under the current formula
San Diego in April is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 21 °C, and the sea is about 16 °C. With about 3 rainy days it is dry.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
77/100 · #8
Warmth
#8
Dryness
#7
Sun
#5
Sea warmth
#8
Published best categories: City break, Active
San Diego · AprilPhoto: Rufustelestrat · CC BY 2.5Climate facts
- Average high
- 21 °C
- Average low
- 10 °C
- Sea
- 16 °C
- Rainy days (est.)
- 3 rainy days (est.)
- Sun (est.)
- 9 h/day
- Humidity
- 68 %
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 | 19 | 9 | 6 | 45 | 7.0 | 69 | 2.4 | 15 | 69 |
| April (selected) | 21 | 10 | 3 | 15 | 8.7 | 68 | 2.5 | 16 | 77 |
| May | 23 | 12 | 1 | 6 | 9.6 | 69 | 2.5 | 17 | 82 |
How do the previous and next months compare?
Baseline: April (77/100)
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 | -8 | -1.7 °C | -1.1 °C | +3.4 | +29.4 mm | -1.7 h | +1.6 % | -0.1 m/s | -0.6 °C |
| May | +5 | +1.8 °C | +1.4 °C | -1.8 | -9 mm | +0.9 h | +1.1 % | ±0 m/s | +1.2 °C |
All twelve months in context
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Frequently asked questions
How warm is San Diego in April?
The average daily high is around 21 °C, with an average daily low of about 10 °C.
Can you swim in San Diego in April?
The sea is about 16 °C (cold).
Does it rain a lot in San Diego in April?
The curated estimate is about 3 rainy days per month, not a directly measured long-term average. Total precipitation averages around 15 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Diego?
By the climate score, May, June, September and October are the strongest months for San Diego. For a beach trip: June, July, August and September. April is not among them.