August in Gatchina averages a daily high of 21.6°C with nights around 10.3°C. Expect roughly 13.5 wet days totalling 80.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Gatchina is May–August.
Based on BELOGORKA, RS (19.7km), 1995–2024. 30 years of August data.