July in Kostroma averages a daily high of 24.7°C with nights around 14°C. Expect roughly 11.5 wet days totalling 72.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Kostroma is May–August.
Based on KOSTROMA, RS (5.9km), 1995–2024. 24 years of July data.