Weather: San Sebastián — September
The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.
🌟 Climate Overview
September is an excellent time to visit San Sebastián. Warm weather with highs of 23°C—great for outdoor activities. This is one of the wettest months—waterproof gear is essential. As peak season, expect higher prices and more tourists. Sea temperature of 22°C is refreshing but swimmable.
Based on weather comfort, crowds, prices, and activity options
23°C
17°C
15days
12.6h
Feels like 25°C / 17°C — humidity makes it feel warmer
135mm
9.3h/day
79%
Humid5.8
High17 km/h (gusts 35)
22°C 💧 Refreshing
Is September a good time to visit San Sebastián?
The weather is near-perfect with ideal temperatures and minimal rain.
Now
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Air Quality
Travel Context
- CrowdsVery Busy
- Travel Costs Peak Rates
Daylight
07:47
20:22
Visiting San Sebastián in September: Pros & Cons
Pros
- Comfortable temperatures for sightseeing
- Abundant sunshine for beach and outdoor fun
- One of the best months to visit
Cons
- Frequent rain may disrupt outdoor activities
- Peak season — expect crowds and higher prices
Things to Do in September
Events & Festivals
Recommended for This Weather
San Sebastián Weather by Month
| Month | Avg High | Avg Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition |
|---|---|---|---|---|---|---|---|---|
| Jan | 13°C | 8°C | 15d (137mm) | 5.8h | 79% Humid | 2.3 Moderate | | Wet |
| Feb | 15°C | 9°C | 12d (92mm) | 7.2h | 77% Humid | 3.6 Moderate | | Good |
| Mar | 15°C | 10°C | 17d (120mm) | 8.6h | 75% Humid | 5.2 High | | Wet |
| Apr | 17°C | 11°C | 14d (99mm) | 9.6h | 77% Humid | 6.9 High | | Wet |
| May | 20°C | 14°C | 16d (103mm) | 10.9h | 80% Very Humid | 8.1 Very High | | Excellent |
| Jun | 23°C | 17°C | 17d (131mm) | 10.4h | 83% Very Humid | 8 Very High | | Excellent |
| Jul | 24°C | 18°C | 12d (52mm) | 11.4h | 82% Very Humid | 8.4 Very High | | Excellent |
| Aug | 25°C | 19°C | 13d (98mm) | 10.6h | 82% Very Humid | 7.5 Very High | | Excellent |
| Sep Current | 23°C | 17°C | 15d (135mm) | 9.3h | 79% Humid | 5.8 High | | Excellent |
| Oct | 21°C | 15°C | 13d (135mm) | 7.6h | 78% Humid | 4.1 Moderate | | Wet |
| Nov | 16°C | 12°C | 15d (173mm) | 6.1h | 80% Very Humid | 2.5 Moderate | | Wet |
| Dec | 14°C | 10°C | 18d (183mm) | 5.4h | 81% Very Humid | 2 Low | | Wet |
San Sebastián
Basque culinary capital, including La Concha beach, La Concha beach promenade and Pintxos bar hopping in Parte Vieja, pintxos bars, and Michelin-starred dining.
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What to Pack for September
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces. A waterproof jacket and shoes are non-negotiable — showers are frequent.
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Frequently Asked Questions
Is September a good time to visit San Sebastián?
Does it get cold at night in San Sebastián in September?
What should I pack for San Sebastián in September?
Does it rain a lot in San Sebastián in September?
Can you swim in San Sebastián in September?
How many hours of daylight are there in San Sebastián in September?
Is September peak season in San Sebastián?
More San Sebastián Guides
Best Time to Visit
Coming soon
Things to Do
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Where to Stay
Best neighborhoods and hotel recommendations
Cost & Budget
Daily costs, money-saving tips, and budget breakdown
Itineraries
Coming soon
Overview
Complete travel guide for San Sebastián: top things to do, itineraries, and typical costs.