The climate in Sinamaica during September can be summarized as very hot, humid and damp.
September is in the fall / autumn in Sinamaica and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 34°C (93°F), whilst at night 25°C (77°F) is normal.
| Daytime temperature | 33.7°C 92.7°F | 
|---|---|
| Nightly temperature | 24.9°C 76.8°F | 
| Average temperature | 29.3°C 84.7°F | 
| Daily sunshine | 6.8 hrs | 
| Avg rainfall | 112 mm 4.4 ins | 
| Rainy days | 8 days | 
| Sea temperature | 28.4°C 83.2°F | 
| Humidity | 76% | 
| Windspeed | 13kph 8 mph | 
On average September is the 3rd wettest month of the year in Sinamaica with around 112mm 4.4 inches of rain making it a 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 6.8 hours of sunshine per day.
				
						
						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 Sinamaica in September 2025.
Best places to visit in September
| Hottest month: | August | 34.4°C 93.9°F | 
|---|---|---|
| Driest month: | March | 7mm 0.3ins | 
| Sunniest month: | February | 8.5hrs | 
| Coldest month: | January | 31.6°C 88.9°F | 
| Wettest month: | October | 170mm 6.7ins |