In August, Lake Forest typically sees daytime highs of 28.5°C and overnight lows around 15.9°C. Compared to the annual average high of 23.2°C, August runs +5.4°C.
August in Lake Forest averages a daytime high of 28.5°C and an overnight low of 15.9°C.
August runs +5.4°C compared to Lake Forest's annual average high of 23.2°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 28.5°C and cooler evenings around 15.9°C.