Estonia has two good windows: Jun–Jul and September. They sit either side of the season the climate record rules out, which is why the shoulder months matter here. The recommended window is Jun–Sep.
Cold; brief mild summer
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | -1.9 | 29 | 42% | Too cold |
| February | -2.7 | 27 | 39% | Too cold |
| March | 0.5 | 33 | 34% | Too cold |
| April | 6.3 | 43 | 33% | Fair |
| May | 12.1 | 54 | 31% | Fair |
| June | 16.7 | 62 | 40% | Go |
| July | 20.3 | 69 | 42% | Go |
| August | 19.8 | 68 | 45% | Fair |
| September | 15.1 | 59 | 40% | Go |
| October | 8.7 | 48 | 46% | Fair |
| November | 3.4 | 38 | 49% | Too cold |
| December | 0.1 | 32 | 48% | Too cold |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
May is the driest month, with rain on 31% of days and daytime highs near 12.1°C (54°F). November is the wettest, at 49%. Temperature swings hard across the year — 23.0°C between July (20.3°C / 69°F) and February (-2.7°C / 27°F) — so packing for the wrong month is the main risk. The record rules out too cold in Nov–Mar.