Saint Barthélemy · AutumnMonth summary
Saint Barthélemy weather in September
✅ Good
🌡️ Temperature min / max
26°C – 28°C
🌧 Rainy days
59% of days
☀️ Sunshine
11.9h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.6/10
📅 📅 Best month
March (8.4/10)
Quick decision
Should you visit Saint Barthélemy in September?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: Favourable conditions in September (7.6/10). March scores higher but the gap is small.
By trip type
Saint Barthélemy in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
🎯 Water at 25°C and lively beaches — September is peak swimming season in Saint Barthélemy Autumn in Saint Barthélemy is often underrated: 28°C, golden light and declining crowds. An interesting window. With 59% of rainy days, always have indoor alternatives planned. A good balance between weather and crowds, even if March (8.4/10) remains theoretically better.
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Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 24°C | 26°C | 42% | 1.1 | 10.9h | 8.0/10 |
| 🌤️ February | 24°C | 25°C | 36% | 1.5 | 11.0h | 8.0/10 |
| 🌤️ March | 24°C | 25°C | 25% | 0.7 | 11.4h | 8.4/10 |
| 🌤️ April | 24°C | 26°C | 38% | 1.6 | 12.0h | 8.2/10 |
| 🌤️ May | 25°C | 27°C | 35% | 1.7 | 12.1h | 8.4/10 |
| 🌤️ June | 26°C | 27°C | 35% | 1.4 | 12.2h | 8.4/10 |
| 🌤️ July | 26°C | 28°C | 51% | 2.2 | 12.2h | 8.0/10 |
| 🌤️ August | 26°C | 28°C | 48% | 2.7 | 12.0h | 8.0/10 |
| 🌤️ September | 26°C | 28°C | 59% | 4.4 | 11.9h | 7.6/10 |
| 🌤️ October | 26°C | 28°C | 57% | 3.8 | 11.4h | 7.7/10 |
| 🌤️ November | 26°C | 27°C | 53% | 3.7 | 10.6h | 7.6/10 |
| 🌤️ December | 25°C | 26°C | 43% | 1.4 | 10.5h | 7.9/10 |
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, Saint Barthélemy averages 28°C, 59% rainy days and 11.9h of sunshine per day. Overall weather score: 7.6/10.
See methodology →
Comparison
September vs March (best month)
The best month is March (score 8.4/10). Difference:
- 🌡️ Max temperature : -3°C
- 🌧 Rainy days : -34%
- ☀️ Sunshine : -0.5h/day
FAQ
FAQ — Saint Barthélemy in September
Is September a good time to visit Saint Barthélemy?
September is an excellent time to visit Saint Barthélemy (score 7.6/10). With 28°C, 11.9h of sunshine and 59% rain, conditions are very favourable.
Does it rain a lot in Saint Barthélemy in September?
Yes, 59% of days see rain in September. Plan some indoor activities as backup.
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