The climate in Altay sumu during September can be summarized as mild and very dry.
September is in the fall / autumn in Altay sumu and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (67°F), whilst at night 5°C (40°F) is normal.
| Daytime temperature | 19.5°C 67.1°F |
|---|---|
| Nightly temperature | 4.5°C 40.1°F |
| Average temperature | 12°C 53.6°F |
| Daily sunshine | 10.3 hrs |
| Avg rainfall | 10 mm 0.4 ins |
| Rainy days | 5 days |
| Sea temperature | 15.9°C 60.6°F |
| Humidity | 48% |
| Windspeed | 6.8kph 4 mph |
On average September is the 4th wettest month of the year in Altay sumu with around 10mm 0.4 inches of rain making it a very dry time to visit.
On the flip side this corresponds to an average of 10.3 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 Altay sumu in September 2025.
Best places to visit in September
| Hottest month: | July | 26.5°C 79.7°F |
|---|---|---|
| Driest month: | February | 2mm 0.1ins |
| Sunniest month: | September | 10.3hrs |
| Coldest month: | January | -11°C 12.2°F |
| Wettest month: | July | 23mm 0.9ins |