Jonkoping is typically mild in September.

Maximum temperatures go down compared to the previous month from +20°C to +16°C. The minimum temperature also goes down from +11°C to +8°C.

Pack a light jacket as it will be warm in the day and cool in the evenings.

Take a look at how September is compared to other months in Jonkoping:

September weather is still as ok as in August. It’s getting colder in September. From +20°C in the day, the average maximum temperature lowers to +16°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 84 mm to 64 mm. Humidity rises from 79% to 83%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The amount of sunny days stay about the same, averaging 4 sunny days during the month.

October brings much the same weather, it remains ok.

The climate in Jonkoping in September has not changed much over the last 43 years.

The average temperature was the lowest in 1987 (+8°C) and the highest in 2020 (+13°C). The driest year was 2018 with only 402 mm of rainfall, and the wettest year was 2012 with 861 mm.

For this page, we’ve looked at the typical weather in Jonkoping, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.