San Sebastián · AutumnMonth summary
San Sebastián weather in September
✅ Good
🌡️ Temperature min / max
16°C – 22°C
🌧 Rainy days
44% of days
☀️ Sunshine
10.6h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.4/10
📅 📅 Best month
July (7.8/10)
Quick decision
Should you visit San Sebastián in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 22°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: September is a good time to visit San Sebastián. July remains slightly better (+0.4 pts).
By trip type
San Sebastián in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Balanced surf conditions — consistent waves and fewer surfers in the lineup Autumn in San Sebastián is often underrated: 22°C, golden light and declining crowds. An interesting window. Expect rain on 44% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. July (7.8/10) is significantly better if possible.
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All months for San Sebastián
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 6°C | 12°C | 52% | 6.6 | 5.9h | 4.0/10 |
| 🌦️ February | 7°C | 14°C | 49% | 5.3 | 7.8h | 4.4/10 |
| 🌦️ March | 8°C | 15°C | 55% | 5.0 | 8.9h | 4.7/10 |
| 🌦️ April | 9°C | 17°C | 49% | 4.1 | 10.1h | 6.9/10 |
| 🌦️ May | 12°C | 18°C | 52% | 4.1 | 11.6h | 7.0/10 |
| 🌦️ June | 15°C | 21°C | 47% | 3.6 | 11.8h | 7.3/10 |
| 🌤️ July | 17°C | 23°C | 40% | 2.4 | 12.2h | 7.8/10 |
| 🌤️ August | 18°C | 24°C | 40% | 3.2 | 11.8h | 7.8/10 |
| 🌤️ September | 16°C | 22°C | 44% | 4.2 | 10.6h | 7.4/10 |
| 🌦️ October | 13°C | 20°C | 43% | 4.5 | 8.9h | 7.1/10 |
| 🌦️ November | 10°C | 15°C | 58% | 7.7 | 6.9h | 4.2/10 |
| 🌦️ December | 8°C | 14°C | 49% | 6.1 | 5.7h | 4.1/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, San Sebastián averages 22°C, 44% rainy days and 10.6h of sunshine per day. Overall weather score: 7.4/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 7.8/10). Difference:
- 🌡️ Max temperature : +1°C
- 🌧 Rainy days : -4%
- ☀️ Sunshine : +1.6h/day
FAQ
FAQ — San Sebastián in September
Is September a good time to visit San Sebastián?
September is an acceptable time for San Sebastián (score 7.4/10). Conditions are decent but not optimal — consider July (7.8/10) if possible.
What to do in San Sebastián in September?
With 22°C max and 10.6h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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