Reykjavík, Iceland is most comfortable in May, June, July. The toughest month for heat is January (comfort 83/100). In August, daytime highs average 13.3°C (feels like 11°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 | 1.4° | -3.2° | -3.5° | 0 | 0 | 0 | 83 |
| February | 2.7° | -1.8° | -2.3° | 0 | 0 | 0 | 87 |
| March | 3.6° | -1° | -0.9° | 0 | 0 | 0 | 89 |
| April | 6.5° | 1.4° | 2.6° | 0 | 0 | 0 | 96 |
| May | 9.1° | 4.3° | 5.7° | 0 | 0 | 0 | 100 |
| June | 10.7° | 6.5° | 7.9° | 0 | 0 | 0 | 100 |
| July | 13.1° | 8.9° | 11.1° | 0 | 0 | 0 | 100 |
| August | 13.3° | 8.8° | 11° | 0 | 0 | 0 | 100 |
| September | 10.4° | 5.9° | 7.5° | 0 | 0 | 0 | 100 |
| October | 6.4° | 2.2° | 2.9° | 0 | 0 | 0 | 96 |
| November | 4.1° | 0° | -0.2° | 0 | 0 | 0 | 90 |
| December | 1.5° | -2.9° | -3.2° | 0 | 0 | 0 | 84 |
No. August daytime highs in Reykjavík average a comfortable 13.3°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 Reykjavík are May, June, July. The toughest month for heat is January, scoring 83/100 on our heat-comfort index.
In August, nights in Reykjavík average a low of 8.8°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.