In January, Lake Forest typically sees daytime highs of 18.6°C and overnight lows around 5.9°C. Compared to the annual average high of 23.2°C, January runs -4.6°C.
January in Lake Forest averages a daytime high of 18.6°C and an overnight low of 5.9°C.
January runs -4.6°C compared to Lake Forest's annual average high of 23.2°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 18.6°C and cooler evenings around 5.9°C.