In September, Jena typically sees daytime highs of 18.8°C and overnight lows around 8.6°C. Compared to the annual average high of 12.6°C, September runs +6.2°C.
September in Jena averages a daytime high of 18.8°C and an overnight low of 8.6°C.
September runs +6.2°C compared to Jena's annual average high of 12.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.8°C and cooler evenings around 8.6°C.