French Guiana · AutumnMonth summary
French Guiana weather in September
✅ Good
🌡️ Temperature min / max
25°C – 30°C
🌧 Rainy days
46% of days
☀️ Sunshine
11.4h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.7/10
📅 📅 Best month
September (7.7/10)
Quick decision
Should you visit French Guiana in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 30°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Favourable conditions in September (7.7/10). September scores higher but the gap is small.
By trip type
French Guiana in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 One of the best months — 31°C, maximum sunshine and ideal conditions Autumn in French Guiana is often underrated: 30°C, golden light and declining crowds. An interesting window. With 46% of rainy days, always have indoor alternatives planned. A good balance between weather and crowds, even if September (7.7/10) 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 | 28°C | 87% | 12.4 | 10.0h | 7.0/10 |
| 🌧️ February | 24°C | 28°C | 88% | 13.7 | 9.2h | 7.0/10 |
| 🌦️ March | 25°C | 28°C | 86% | 9.6 | 10.5h | 7.1/10 |
| 🌧️ April | 24°C | 28°C | 95% | 17.2 | 9.1h | 7.0/10 |
| 🌧️ May | 24°C | 28°C | 99% | 21.7 | 8.0h | 6.4/10 |
| 🌧️ June | 24°C | 28°C | 98% | 18.5 | 9.7h | 7.0/10 |
| 🌦️ July | 24°C | 29°C | 91% | 10.7 | 11.1h | 7.0/10 |
| ⛅ August | 24°C | 30°C | 65% | 4.5 | 11.5h | 7.2/10 |
| 🌤️ September | 25°C | 30°C | 46% | 2.5 | 11.4h | 7.7/10 |
| 🌤️ October | 25°C | 30°C | 47% | 2.6 | 11.6h | 7.7/10 |
| ⛅ November | 25°C | 29°C | 80% | 7.9 | 11.1h | 7.1/10 |
| 🌧️ December | 24°C | 28°C | 94% | 13.9 | 9.2h | 7.0/10 |
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, French Guiana averages 30°C, 46% rainy days and 11.4h of sunshine per day. Overall weather score: 7.7/10.
See methodology →
Comparison
September vs September (best month)
The best month is September (score 7.7/10). Difference:
- 🌡️ Max temperature : +0°C
- 🌧 Rainy days : +0%
- ☀️ Sunshine : +0.0h/day
FAQ
FAQ — French Guiana in September
Is September a good time to visit French Guiana?
September is an excellent time to visit French Guiana (score 7.7/10). With 30°C, 11.4h of sunshine and 46% rain, conditions are very favourable.
What to do in French Guiana in September?
With 30°C max and 11.4h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in French Guiana
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