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The weather in Sisimiut in September is very cold with temperatures between 2°C and 5°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Sisimiut during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
You can expect a few days of snow in Sisimiut during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Sisimiut.
Our weather forecast can give you a great sense of what weather to expect in Sisimiut in September 2025.
If you’re planning to visit Sisimiut in the near future, we highly recommend that you review the 14 day weather forecast for Sisimiut before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -10° / -14° | 3 | 9 | 19 | 48 mm | Awful | Sisimiut in January |
| February | -12° / -16° | 2 | 8 | 18 | 29 mm | Awful | Sisimiut in February |
| March | -10° / -16° | 3 | 8 | 20 | 40 mm | Awful | Sisimiut in March |
| April | -4° / -10° | 4 | 10 | 16 | 55 mm | Awful | Sisimiut in April |
| May | 2° / -3° | 5 | 14 | 12 | 36 mm | Awful | Sisimiut in May |
| June | 7° / 3° | 3 | 24 | 3 | 27 mm | Bad | Sisimiut in June |
| July | 11° / 6° | 5 | 26 | 1 | 61 mm | Ok | Sisimiut in July |
| August | 10° / 6° | 7 | 24 | 1 | 76 mm | Bad | Sisimiut in August |
| September | 5° / 2° | 7 | 15 | 7 | 57 mm | Awful | Sisimiut in September |
| October | 0° / -3° | 4 | 12 | 15 | 59 mm | Awful | Sisimiut in October |
| November | -5° / -9° | 4 | 7 | 18 | 61 mm | Awful | Sisimiut in November |
| December | -7° / -10° | 4 | 8 | 20 | 60 mm | Awful | Sisimiut in December |