In April, Harlingen typically sees daytime highs of 29.2°C and overnight lows around 18.9°C. Compared to the annual average high of 28.5°C, April runs +0.6°C.
April in Harlingen averages a daytime high of 29.2°C and an overnight low of 18.9°C.
April runs +0.6°C compared to Harlingen's annual average high of 28.5°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 29.2°C and cooler evenings around 18.9°C.