In October, Harlingen typically sees daytime highs of 29.6°C and overnight lows around 18.6°C. Compared to the annual average high of 28.5°C, October runs +1.0°C.
October in Harlingen averages a daytime high of 29.6°C and an overnight low of 18.6°C.
October runs +1.0°C compared to Harlingen's annual average high of 28.5°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 29.6°C and cooler evenings around 18.6°C.