September weather forecast
Slovenia

September in Slovenia heralds the beginning of the autumn season, marked by a noticeable decrease in temperatures compared to the summer months. Nationally, average temperatures generally range from 13°C (55.4°F) to 22°C (71.6°F). In Ljubljana, temperatures usually vary between 14°C (57.2°F) and 24°C (75.2°F). The coastal areas such as Koper, influenced by the Adriatic Sea, see milder temperatures, typically fluctuating from 16°C (60.8°F) to 24°C (75.2°F). The mountainous areas, including Kranjska Gora, begin to cool down significantly, with temperatures often staying below 20°C (68°F).

Precipitation levels in September are relatively high, often reaching up to 90mm (3.54"). Rainfall during this month contributes to the stunning autumn foliage in Slovenia's forests, painting the landscapes in a spectrum of red, orange, and yellow hues.

Daylight hours continue to decrease in September, with sunrise taking place around 6:30 am and sunset happening close to 7:00 pm. Despite shorter days, there is still ample daylight for outdoor activities. Compared to August, the weather in September is cooler and more unpredictable, indicating the transition from summer to autumn. Despite the change in season, September's mild temperatures and beautiful scenery make it an attractive month for tourists to visit Slovenia.

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• Ljubljana - September »
  On the first day of September in Ljubljana sunrise is at 06:23 and sunset at 19:40. The months with the most rainfall in Ljubljana are September and October, with an average 147mm (5.79") of precipitation.
• Maribor - September »
  In Maribor during September, the rain falls for 14.5 days and regularly aggregates up to 77mm (3.03") of precipitation. In Maribor in September, during 14.5 rainfall days, 77mm (3.03") of precipitation is typically accumulated.
• Celje - September »
  In Celje, during September, the rain falls for 15.1 days and regularly aggregates up to 77mm (3.03") of precipitation. In Celje in September, during 15.1 rainfall days, 77mm (3.03") of precipitation is typically accumulated.
• Koper - September »
  Koper's weather in September heralds the arrival of autumn, with a slight diminution in sea temperature to 23.3°C (73.9°F). In September, the average sea temperature in Koper is 23.3°C (73.9°F).
• Ptuj - September »
  On the last day of September, in Ptuj, sunrise is at 06:54 and sunset at 18:38 CEST. In Ptuj, in September, it is raining for 12 days, with typically 97mm (3.82") of accumulated precipitation.
• Trbovlje - September »
  On the last day of September, in Trbovlje, sunrise is at 06:57 and sunset at 18:41 CEST. In Trbovlje in September, it is raining for 15.1 days, with typically 77mm (3.03") of accumulated precipitation.
• Kamnik - September »
  In Kamnik, in September, during 15.7 rainfall days, 86mm (3.39") of precipitation is typically accumulated. In Kamnik, in September, it is raining for 15.7 days, with typically 86mm (3.39") of accumulated precipitation.