July in Haarlem averages a daily high of 22.4°C with nights around 13.5°C. Expect roughly 13.4 wet days totalling 78.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Haarlem is May–September.
Based on SCHIPHOL, NL (12.7km), 1995–2024. 30 years of July data.