July in Harlingen averages a daily high of 35.3°C with nights around 24.6°C. Expect roughly 5.7 wet days totalling 74.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Harlingen is November–March.
Based on HARLINGEN, TX US (2.7km), 1995–2024. 26 years of July data.