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The weather in Tromso in September is very cold with temperatures between 4°C and 9°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Tromso. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Please note that Tromso can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Tromso in September 2025.
If you’re planning to visit Tromso in the near future, we highly recommend that you review the 14 day weather forecast for Tromso before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -6° / -10° | 6 | 8 | 18 | 153 mm | Awful | Tromso in January |
| February | -6° / -10° | 4 | 6 | 19 | 167 mm | Awful | Tromso in February |
| March | -3° / -8° | 6 | 2 | 25 | 199 mm | Awful | Tromso in March |
| April | 1° / -5° | 8 | 5 | 18 | 179 mm | Awful | Tromso in April |
| May | 6° / 0° | 9 | 12 | 9 | 147 mm | Awful | Tromso in May |
| June | 10° / 5° | 13 | 16 | 2 | 184 mm | Awful | Tromso in June |
| July | 13° / 8° | 11 | 20 | 0 | 159 mm | Bad | Tromso in July |
| August | 13° / 7° | 10 | 21 | 0 | 155 mm | Bad | Tromso in August |
| September | 9° / 4° | 12 | 17 | 1 | 185 mm | Bad | Tromso in September |
| October | 2° / -1° | 11 | 9 | 11 | 204 mm | Awful | Tromso in October |
| November | -1° / -4° | 8 | 8 | 15 | 181 mm | Awful | Tromso in November |
| December | -4° / -7° | 6 | 7 | 19 | 163 mm | Awful | Tromso in December |