Interlaken, Switzerland is most comfortable in February, March, April. The toughest month for heat is August (comfort 77/100). In August, daytime highs average 24.8°C (feels like 26.7°C) with 4 days over 30°C and 1.8 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | 6.4° | 0.8° | 4° | 0 | 0 | 0 | 96 |
| February | 9.6° | 2.6° | 7.3° | 0 | 0 | 0 | 100 |
| March | 12° | 3.5° | 10° | 0 | 0 | 0 | 100 |
| April | 14.1° | 5° | 13° | 0 | 0 | 0 | 100 |
| May | 17.9° | 9.2° | 17.9° | 0 | 0 | 0 | 100 |
| June | 24.1° | 14.2° | 26° | 2.2 | 0 | 0.2 | 85 |
| July | 24.4° | 15.8° | 26.5° | 2.4 | 0 | 1.2 | 81 |
| August | 24.8° | 16.2° | 26.7° | 4 | 0 | 1.8 | 77 |
| September | 20.6° | 13.5° | 21.3° | 0 | 0 | 0 | 100 |
| October | 18.1° | 10.5° | 17.5° | 0 | 0 | 0 | 100 |
| November | 10.9° | 5° | 9.2° | 0 | 0 | 0 | 100 |
| December | 8.6° | 2.6° | 6.5° | 0 | 0 | 0 | 100 |
No. August daytime highs in Interlaken average a comfortable 24.8°C with 4 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 Interlaken are February, March, April. The toughest month for heat is August, scoring 77/100 on our heat-comfort index.
In August, nights in Interlaken average a low of 16.2°C, with 1.8 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.