Oslo, Norway is most comfortable in April, May, July. The toughest month for heat is January (comfort 79/100). In August, daytime highs average 20.5°C (feels like 19.5°C) with 0 days over 30°C and 0 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | -0.5° | -5.8° | -4.6° | 0 | 0 | 0 | 79 |
| February | 1.5° | -4.5° | -2.5° | 0 | 0 | 0 | 84 |
| March | 6.2° | -1.8° | 2.6° | 0 | 0 | 0 | 96 |
| April | 11° | 1.8° | 7.4° | 0 | 0 | 0 | 100 |
| May | 17.2° | 7.5° | 14.6° | 0 | 0 | 0 | 100 |
| June | 21.2° | 12.4° | 19.9° | 0.6 | 0 | 0 | 99 |
| July | 22° | 14.3° | 21.6° | 0.4 | 0 | 0 | 100 |
| August | 20.5° | 13.1° | 19.5° | 0 | 0 | 0 | 100 |
| September | 17° | 10.4° | 15.7° | 0 | 0 | 0 | 100 |
| October | 10.6° | 5.5° | 8.1° | 0 | 0 | 0 | 100 |
| November | 4.8° | 0.9° | 1.6° | 0 | 0 | 0 | 92 |
| December | 0.4° | -3.9° | -3.3° | 0 | 0 | 0 | 81 |
No. August daytime highs in Oslo average a comfortable 20.5°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 Oslo are April, May, July. The toughest month for heat is January, scoring 79/100 on our heat-comfort index.
In August, nights in Oslo average a low of 13.1°C, with 0 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.