March in Harlingen averages a daily high of 26.5°C with nights around 15.1°C. Expect roughly 5.6 wet days totalling 37.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Harlingen is November–March.
Based on HARLINGEN, TX US (2.7km), 1995–2024. 26 years of March data.