August in Union averages a daily high of 29.6°C with nights around 20.3°C. Expect roughly 9.8 wet days totalling 108.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Union is May–June.
Based on NEWARK LIBERTY INTERNATIONAL AIRPORT, NJ US (8.1km), 1995–2024. 30 years of August data.