In August, McAllen typically sees daytime highs of 35.9°C and overnight lows around 23.6°C. Compared to the annual average high of 29.5°C, August runs +6.4°C.
August in McAllen averages a daytime high of 35.9°C and an overnight low of 23.6°C.
August runs +6.4°C compared to McAllen's annual average high of 29.5°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 35.9°C and cooler evenings around 23.6°C.