July in Gatchina averages a daily high of 23.2°C with nights around 11.9°C. Expect roughly 13 wet days totalling 82.5mm. 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 July data.