May in Kaunas averages a daily high of 18.8°C with nights around 7.3°C. Expect roughly 12.5 wet days totalling 55.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kaunas is May–September.
Based on KAUNAS, LH (5.3km), 1995–2024. 26 years of May data.