Tallinn, Estonia is most comfortable in April, May, September. The toughest month for heat is January (comfort 78/100). In August, daytime highs average 20.9°C (feels like 20.2°C) with 0.8 days over 30°C and 0.8 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | -0.6° | -4.7° | -5.3° | 0 | 0 | 0 | 78 |
| February | -0.3° | -4.6° | -4.9° | 0 | 0 | 0 | 79 |
| March | 4.4° | -2.1° | 0.1° | 0 | 0 | 0 | 91 |
| April | 8.6° | 1° | 4.8° | 0 | 0 | 0 | 100 |
| May | 14.8° | 6.1° | 12.1° | 0 | 0 | 0 | 100 |
| June | 20.7° | 11.9° | 19.8° | 1.4 | 0 | 0.6 | 98 |
| July | 22.5° | 14.9° | 22.2° | 0.6 | 0 | 1 | 98 |
| August | 20.9° | 13.8° | 20.2° | 0.8 | 0 | 0.8 | 98 |
| September | 16.6° | 10.1° | 14.7° | 0 | 0 | 0 | 100 |
| October | 10.2° | 5.6° | 6.9° | 0 | 0 | 0 | 100 |
| November | 4.6° | 1.2° | 0.9° | 0 | 0 | 0 | 91 |
| December | 0.4° | -3.6° | -4.1° | 0 | 0 | 0 | 81 |
No. August daytime highs in Tallinn average a comfortable 20.9°C with 0.8 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 Tallinn are April, May, September. The toughest month for heat is January, scoring 78/100 on our heat-comfort index.
In August, nights in Tallinn average a low of 13.8°C, with 0.8 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.