In September, Brest typically sees daytime highs of 18.6°C and overnight lows around 11.8°C. Compared to the annual average high of 14.3°C, September runs +4.3°C.
September in Brest averages a daytime high of 18.6°C and an overnight low of 11.8°C.
September runs +4.3°C compared to Brest's annual average high of 14.3°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 18.6°C and cooler evenings around 11.8°C.