Spain
San Sebastian in August: weather, sea & travel advice
This month's data profile
Strong month under the current formula
San Sebastian in August is climatically well suited to city breaks, family holidays, beach holidays and active holidays and hiking. The average daily high is around 24 °C, and the sea is about 22 °C. With about 10 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
83/100 · #1
Warmth
#1
Dryness
#2
Sun
#4
Sea warmth
#1
Published best categories: Overall, Beach, City break, Active, Family
San Sebastian · AugustPhoto: Ander.gd · CC BY-SA 4.0Climate facts
- Average high
- 24 °C
- Average low
- 19 °C
- Sea
- 22 °C
- Rainy days (est.)
- 10 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 77 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| July | 23 | 18 | 10 | 49 | 7.4 | 79 | 2.5 | 21 | 80 |
| August (selected) | 24 | 19 | 10 | 55 | 6.6 | 77 | 2.5 | 22 | 83 |
| September | 22 | 17 | 12 | 84 | 5.3 | 76 | 2.7 | 21 | 72 |
How do the previous and next months compare?
Baseline: August (83/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| July | -3 | -1 °C | -0.8 °C | -0.1 | -6.1 mm | +0.8 h | +2.3 % | ±0 m/s | -1 °C |
| September | -11 | -2 °C | -1.7 °C | +2.3 | +28.8 mm | -1.3 h | -0.8 % | +0.2 m/s | -1.4 °C |
All twelve months in context
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Frequently asked questions
How warm is San Sebastian in August?
The average daily high is around 24 °C, with an average daily low of about 19 °C.
Can you swim in San Sebastian in August?
The sea is about 22 °C (swimmable).
Does it rain a lot in San Sebastian in August?
The curated estimate is about 10 rainy days per month, not a directly measured long-term average. Total precipitation averages around 55 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. August is one of them.