In September, West Haven typically sees daytime highs of 23.3°C and overnight lows around 12.5°C. Compared to the annual average high of 15.4°C, September runs +7.9°C.
September in West Haven averages a daytime high of 23.3°C and an overnight low of 12.5°C.
September runs +7.9°C compared to West Haven's annual average high of 15.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 23.3°C and cooler evenings around 12.5°C.