San Sebastián · AutumnMonth summary
San Sebastián weather in September
✅ Good
🌡️ Temperature min / max
61°F – 72°F
🌧 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°F.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Favourable conditions in September (7.4/10). July scores higher but the gap is small.
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
Autumn in San Sebastián is often underrated: 22°F, 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 °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 43°F | 54°F | 52% | 0.3in | 5.9h | 4.0/10 |
| 🌦️ February | 45°F | 57°F | 49% | 0.2in | 7.8h | 4.4/10 |
| 🌦️ March | 46°F | 59°F | 55% | 0.2in | 8.9h | 4.7/10 |
| 🌦️ April | 48°F | 63°F | 49% | 0.2in | 10.1h | 6.9/10 |
| 🌦️ May | 54°F | 64°F | 52% | 0.2in | 11.6h | 7.0/10 |
| 🌦️ June | 59°F | 70°F | 47% | 0.1in | 11.8h | 7.3/10 |
| 🌤️ July | 63°F | 73°F | 40% | 0.1in | 12.2h | 7.8/10 |
| 🌤️ August | 64°F | 75°F | 40% | 0.1in | 11.8h | 7.8/10 |
| 🌤️ September | 61°F | 72°F | 44% | 0.2in | 10.6h | 7.4/10 |
| 🌦️ October | 55°F | 68°F | 43% | 0.2in | 8.9h | 7.1/10 |
| 🌦️ November | 50°F | 59°F | 58% | 0.3in | 6.9h | 4.2/10 |
| 🌦️ December | 46°F | 57°F | 49% | 0.2in | 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 72°F, 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°F
- 🌧 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 72°F max and 10.6h of sunshine, focus on cultural sites, museums and local gastronomy.
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Activities & tours
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