Tromsø, Norway is most comfortable in May, June, July. The toughest month for heat is December (comfort 72/100). In August, daytime highs average 16.8°C (feels like 15.7°C) with 0 days over 30°C and 0.2 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | -2.9° | -7.7° | -7.1° | 0 | 0 | 0 | 73 |
| February | -1.6° | -6.3° | -5.8° | 0 | 0 | 0 | 76 |
| March | 0° | -5.1° | -3.9° | 0 | 0 | 0 | 80 |
| April | 2.3° | -3.4° | -1.3° | 0 | 0 | 0 | 86 |
| May | 8.2° | 2.1° | 5.3° | 0 | 0 | 0 | 100 |
| June | 14.6° | 8.2° | 12.8° | 0 | 0 | 0.2 | 100 |
| July | 18° | 11.1° | 17.1° | 0 | 0 | 0 | 100 |
| August | 16.8° | 10.7° | 15.7° | 0 | 0 | 0.2 | 100 |
| September | 11.9° | 6.8° | 10° | 0 | 0 | 0 | 100 |
| October | 4.7° | 0.6° | 1.7° | 0 | 0 | 0 | 92 |
| November | -0.2° | -4.2° | -3.8° | 0 | 0 | 0 | 79 |
| December | -3.2° | -7.9° | -7.4° | 0 | 0 | 0 | 72 |
No. August daytime highs in Tromsø average a comfortable 16.8°C with 0 days over 30°C — it's a solid summer choice for avoiding extreme heat.
Based on 5 years of climate data, the most comfortable months in Tromsø are May, June, July. The toughest month for heat is December, scoring 72/100 on our heat-comfort index.
In August, nights in Tromsø average a low of 10.7°C, with 0.2 tropical nights per month (nights that stay at or above 20°C) — a key factor for sleep quality if your stay has no air conditioning.
Tell us where and when you're going. If a heatwave becomes likely for your dates, we'll email you early — with cooler day-by-day alternatives nearby.