In June, Saint Charles typically sees daytime highs of 29.4°C and overnight lows around 17.2°C. Compared to the annual average high of 18.7°C, June runs +10.7°C.
June in Saint Charles averages a daytime high of 29.4°C and an overnight low of 17.2°C.
June runs +10.7°C compared to Saint Charles's annual average high of 18.7°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 29.4°C and cooler evenings around 17.2°C.