The climate in Tsetserleg during September can be summarized as cool and reasonably dry.
September is in the fall / autumn in Tsetserleg and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (55°F), whilst at night -1°C (30°F) is normal.
| Daytime temperature | 12.6°C 54.6°F | 
|---|---|
| Nightly temperature | -1.2°C 29.9°F | 
| Average temperature | 5.7°C 42.3°F | 
| Daily sunshine | 9.1 hrs | 
| Avg rainfall | 37 mm 1.4 ins | 
| Rainy days | 9 days | 
| Sea temperature | 13.8°C 56.8°F | 
| Humidity | 58% | 
| Windspeed | 6.1kph 4 mph | 
On average September is the 4th wettest month of the year in Tsetserleg with around 37mm 1.4 inches of rain making it a reasonably dry 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 9.1 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 Tsetserleg in September 2025.
Best places to visit in September
| Hottest month: | July | 19.2°C 66.6°F | 
|---|---|---|
| Driest month: | February | 6mm 0.2ins | 
| Sunniest month: | March | 8.6hrs | 
| Coldest month: | January | -24.2°C -11.6°F | 
| Wettest month: | July | 81mm 3.2ins |