In September, Tromso typically sees daytime highs of 10.8°C and overnight lows around 4.2°C. Compared to the annual average high of 5.9°C, September runs +4.8°C.
September in Tromso averages a daytime high of 10.8°C and an overnight low of 4.2°C.
September runs +4.8°C compared to Tromso's annual average high of 5.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 10.8°C and cooler evenings around 4.2°C.