Grand-Santi Weather in September
What's the weather like in Grand-Santi (Guyane) in September 2025?
The climate in Grand-Santi during September can be summarized as hot and a little damp.
September is in the fall / autumn in Grand-Santi and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a warm 33°C (91°F), whilst at night 22°C (71°F) is normal.
| Daytime temperature | 32.7°C 90.8°F |
|---|---|
| Nightly temperature | 21.6°C 70.8°F |
| Average temperature | 27.1°C 80.8°F |
| Daily sunshine | 9 hrs |
| Avg rainfall | 84 mm 3.3 ins |
| Rainy days | 8 days |
| Sea temperature | 28.1°C 82.6°F |
| Humidity | 58% |
| Windspeed | 3.2kph 2 mph |
On average September is the 2nd driest month of the year in Grand-Santi with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 9 hours of sunshine per day.
September temperatures in Grand-Santi
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Grand-Santi in September 2025.
Other monthly averages
Best places to visit in September
Grand-Santi weather stats
| Hottest month: | October | 32.6°C 90.7°F |
|---|---|---|
| Driest month: | October | 79mm 3.1ins |
| Sunniest month: | September | 9hrs |
| Coldest month: | January | 29.7°C 85.5°F |
| Wettest month: | May | 361mm 14.2ins |
© Google