Click on a day for an hourly weather forecast
The weather in Longyearbyen in September is very cold with temperatures between -2°C and 2°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Longyearbyen 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.
Longyearbyen is going to experience quite a number of days of snow during September. It’s the perfect time to build snowmen, drink hot cocoa, and have a snowball fight. Just remember to wear a warm scarf and a pair of mittens!
Our weather forecast can give you a great sense of what weather to expect in Longyearbyen in September 2026.
If you’re planning to visit Longyearbyen in the near future, we highly recommend that you review the 14 day weather forecast for Longyearbyen before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -10° / -15° | 4 | 9 | 19 | 65 mm | Awful | Longyearbyen in January |
| February | -12° / -16° | 5 | 6 | 19 | 49 mm | Awful | Longyearbyen in February |
| March | -12° / -18° | 6 | 7 | 19 | 48 mm | Awful | Longyearbyen in March |
| April | -8° / -15° | 6 | 7 | 18 | 36 mm | Awful | Longyearbyen in April |
| May | -2° / -7° | 7 | 7 | 18 | 44 mm | Awful | Longyearbyen in May |
| June | 2° / -2° | 6 | 14 | 10 | 38 mm | Awful | Longyearbyen in June |
| July | 4° / 2° | 5 | 25 | 1 | 48 mm | Bad | Longyearbyen in July |
| August | 4° / 1° | 6 | 21 | 4 | 59 mm | Awful | Longyearbyen in August |
| September | 2° / -2° | 7 | 14 | 9 | 69 mm | Awful | Longyearbyen in September |
| October | -4° / -7° | 8 | 8 | 15 | 66 mm | Awful | Longyearbyen in October |
| November | -7° / -12° | 6 | 6 | 19 | 60 mm | Awful | Longyearbyen in November |
| December | -9° / -14° | 6 | 7 | 19 | 49 mm | Awful | Longyearbyen in December |