October in Harlingen averages a daily high of 30.6°C with nights around 19°C. Expect roughly 6.3 wet days totalling 89.5mm. 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 October data.