In September, La Seyne-sur-Mer typically sees daytime highs of 23.5°C and overnight lows around 15.7°C. Compared to the annual average high of 18.3°C, September runs +5.2°C.
September in La Seyne-sur-Mer averages a daytime high of 23.5°C and an overnight low of 15.7°C.
September runs +5.2°C compared to La Seyne-sur-Mer's annual average high of 18.3°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 23.5°C and cooler evenings around 15.7°C.