Tromsø weather in September
September in Tromsø: cold, rainy, with clean air — a great time to visit.
#4 of 12 months in Tromsø · #428 of 604 destinations to visit in September · comfort 70/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Tromsø climate normals — September
| Daytime high | 11°C / 51°F | 🧥 cold |
|---|---|---|
| Nighttime low | 6°C / 43°F | |
| Feels like (high) | 9°C / 48°F | |
| Rainfall | 141 mm / 5.5 in | 🌧 rainy |
| Rainy days | 20 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 5.3 h/day | |
| Daylight | 13.3 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 0.4 cm / 0.2 in | |
| Air quality (US AQI) | 27 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Tromsø in September — FAQ
- Is September a good time to visit Tromsø?
- September in Tromsø: cold, rainy, with clean air — a great time to visit. It ranks #4 of 12 months for Tromsø on SeasonMap's comfort score (70/100).
- What is the weather like in Tromsø in September?
- In September, Tromsø averages a daily high of 10.5°C and a low of 6.1°C, with about 140.5 mm of rain over roughly 20.2 rainy days.
- What is the air quality in Tromsø in September?
- Tromsø has a mean US Air Quality Index of about 27 in September.