Spain
San Sebastian in April: weather, sea & travel advice
This month's data profile
Rain shapes the decision
San Sebastian in April is climatically mixed. The average daily high is around 15 °C, and the sea is about 14 °C. With about 14 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
39/100 · #7
Warmth
#7
Dryness
#9
Sun
#5
Sea warmth
#9
Published best categories: none
San Sebastian · AprilPhoto: Ander.gd · CC BY-SA 4.0Climate facts
- Average high
- 15 °C
- Average low
- 10 °C
- Sea
- 14 °C
- Rainy days (est.)
- 14 rainy days (est.)
- Sun (est.)
- 6 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 | 13 | 9 | 12 | 81 | 4.5 | 80 | 3.2 | 13 | 37 |
| April (selected) | 15 | 10 | 14 | 87 | 5.8 | 80 | 3.0 | 14 | 39 |
| May | 18 | 13 | 13 | 77 | 6.9 | 80 | 2.6 | 16 | 51 |
How do the previous and next months compare?
Baseline: April (39/100)
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 | -2 | -1.5 °C | -1.4 °C | -1.7 | -5.6 mm | -1.3 h | ±0 % | +0.2 m/s | -1.1 °C |
| May | +12 | +2.8 °C | +2.7 °C | -0.5 | -10 mm | +1.1 h | +0.5 % | -0.3 m/s | +2.3 °C |
All twelve months in context
Find a place to stay
Where to stay in San Sebastian
Compare available stays, prices and cancellation terms for San Sebastian on Booking.com.
Booking.comFind places to stayAffiliate link: there is no extra cost to you.
Useful next decisions
Frequently asked questions
How warm is San Sebastian in April?
The average daily high is around 15 °C, with an average daily low of about 10 °C.
Can you swim in San Sebastian in April?
The sea is about 14 °C (cold).
Does it rain a lot in San Sebastian in April?
The curated estimate is about 14 rainy days per month, not a directly measured long-term average. Total precipitation averages around 87 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Sebastian?
By the climate score, June, July, August and September are the strongest months for San Sebastian. For a beach trip: June, July, August and September. April is not among them.