Monthly climate guide
Tromsø weather in September
September in Tromsø is typically cool, with average daytime highs around 10°C (51°F) and night-time lows near 5°C (40°F). The month usually brings about 110 mm of rain (wet) and is often cloudy. Daytime highs are 4°C cooler than August and 7°C warmer than October.
What stands out in September
- Just 170 km apart, but Tromsø runs about 2°C warmer than Alta this month.
- Skies are at their clearest this time of year.
- It cools down fast from here: October is about 7°C cooler.
- September brings early autumn to Tromsø.
Avg high
10°C
51°F
Avg low
5°C
40°F
Rainfall
110 mm
wet
Humidity
89%
relative
Sky
79%
cloud · often cloudy
Tromsø weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | -6°C / 21°F | -11°C / 11°F | 89 mm | 96% | 82% |
| February | -5°C / 23°F | -11°C / 13°F | 96 mm | 95% | 83% |
| March | -3°C / 27°F | -8°C / 18°F | 135 mm | 93% | 87% |
| April | 0°C / 33°F | -5°C / 24°F | 92 mm | 92% | 82% |
| May | 6°C / 43°F | 0°C / 33°F | 92 mm | 86% | 79% |
| June | 12°C / 53°F | 5°C / 41°F | 114 mm | 81% | 81% |
| July | 16°C / 60°F | 9°C / 47°F | 104 mm | 82% | 79% |
| August | 14°C / 57°F | 8°C / 46°F | 111 mm | 85% | 79% |
| September | 10°C / 51°F | 5°C / 40°F | 110 mm | 89% | 79% |
| October | 3°C / 37°F | -1°C / 30°F | 105 mm | 94% | 82% |
| November | -1°C / 30°F | -5°C / 23°F | 120 mm | 96% | 85% |
| December | -3°C / 26°F | -8°C / 17°F | 115 mm | 96% | 86% |
What to pack for September
- A proper insulated winter coat
- A hat, scarf and gloves
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Tromsø?
Compare the months in the chart above to find your ideal window.
Best time to visit Tromsø →Other Norway cities in September
Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Tromsø weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/norway/tromso/september
<a href="https://weathercompare.eu/weather/norway/tromso/september">Tromsø weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/norway/tromso" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Tromsø weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/norway/tromso/september">Tromsø weather in September</a> – WeatherCompare</p>
Tromsø in September: quick answers
Is September a good time to visit Tromsø?
September is cool in Tromsø, with highs around 10°C. Better for museums and city walks than the beach, and usually quieter.
How warm is Tromsø in September?
Average highs are about 10°C (51°F) and average lows about 5°C (40°F), based on 10 years of daily data.
Does it rain a lot in Tromsø in September?
Tromsø typically gets around 110 mm of rain in September — wet.
Figures are long-term averages for the area around Tromsø (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.