In September, Joensuu typically sees daytime highs of 12.2°C and overnight lows around 5.5°C. Compared to the annual average high of 5.9°C, September runs +6.3°C.
September in Joensuu averages a daytime high of 12.2°C and an overnight low of 5.5°C.
September runs +6.3°C compared to Joensuu's annual average high of 5.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 12.2°C and cooler evenings around 5.5°C.