April in Mustamäe averages a daily high of 9.5°C with nights around 0.7°C. Expect roughly 9.9 wet days totalling 34.1mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Mustamäe is June–August.
Based on TALLINN, EN (4.5km), 1995–2024. 30 years of April data.