In September, Fredrikstad typically sees daytime highs of 15.3°C and overnight lows around 9.1°C. Compared to the annual average high of 9.8°C, September runs +5.5°C.
September in Fredrikstad averages a daytime high of 15.3°C and an overnight low of 9.1°C.
September runs +5.5°C compared to Fredrikstad's annual average high of 9.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 15.3°C and cooler evenings around 9.1°C.