August in Jōetsu averages a daily high of 31.4°C. Expect roughly 12.1 wet days totalling 186.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Jōetsu is May–June.
Based on TAKADA, JA (5.5km), 1995–2024. 21 years of August data.