The climate in Sigiriya during September can be summarized as hot, humid and a little damp.
September is in the fall / autumn in Sigiriya and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 23°C (73°F) is normal.
| Daytime temperature | 31°C 87.7°F | 
|---|---|
| Nightly temperature | 22.9°C 73.1°F | 
| Average temperature | 26.9°C 80.4°F | 
| Daily sunshine | 6.6 hrs | 
| Avg rainfall | 99 mm 3.9 ins | 
| Rainy days | 9 days | 
| Sea temperature | 28.1°C 82.6°F | 
| Humidity | 73% | 
| Windspeed | 13.7kph 9 mph | 
On average September is the 6th wettest month of the year in Sigiriya with around 99mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.6 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 Sigiriya in September 2025.
Best places to visit in September
| Hottest month: | May | 31.6°C 88.9°F | 
|---|---|---|
| Driest month: | June | 55mm 2.2ins | 
| Sunniest month: | March | 8.9hrs | 
| Coldest month: | January | 28.2°C 82.8°F | 
| Wettest month: | November | 298mm 11.7ins |