In August, Rennes typically sees daytime highs of 23.2°C and overnight lows around 12.4°C. Compared to the annual average high of 15.3°C, August runs +7.9°C.
August in Rennes averages a daytime high of 23.2°C and an overnight low of 12.4°C.
August runs +7.9°C compared to Rennes's annual average high of 15.3°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 23.2°C and cooler evenings around 12.4°C.