In August, Brussels typically sees daytime highs of 21.9°C and overnight lows around 12.3°C. Compared to the annual average high of 13.8°C, August runs +8.2°C.
August in Brussels averages a daytime high of 21.9°C and an overnight low of 12.3°C.
August runs +8.2°C compared to Brussels's annual average high of 13.8°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 21.9°C and cooler evenings around 12.3°C.