Lithuania has two good windows: May and Aug–Sep. They sit either side of the season the climate record rules out, which is why the shoulder months matter here. The recommended window is May–Sep.
Cold; brief mild summer
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | -3.6 | 26 | 43% | Too cold |
| February | -1.9 | 29 | 43% | Too cold |
| March | 3.4 | 38 | 37% | Too cold |
| April | 11.6 | 53 | 34% | Fair |
| May | 17.3 | 63 | 44% | Go |
| June | 20.6 | 69 | 51% | Fair |
| July | 22.7 | 73 | 53% | Fair |
| August | 22.5 | 72 | 43% | Go |
| September | 17.4 | 63 | 37% | Go |
| October | 10.1 | 50 | 38% | Fair |
| November | 3.1 | 38 | 42% | Too cold |
| December | -1.9 | 29 | 42% | 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.
April is the driest month, with rain on 34% of days and daytime highs near 11.6°C (53°F). July is the wettest, at 53%. Temperature swings hard across the year — 26.3°C between July (22.7°C / 73°F) and January (-3.6°C / 26°F) — so packing for the wrong month is the main risk. The record rules out too cold in Nov–Mar.