Slovenia weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Slovenia in September. Check more long-term weather averages for Slovenia in September before you book your next holiday to Slovenia in 2025/2026.

  • 21°C maximum daytime temperature in September in Slovenia (Ljubljana)21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 12 days with some rainfall in September in Slovenia (Ljubljana)12
    12 days with some rainfall
  • 11°C minimum night-time temperature in September in Slovenia (Ljubljana)11
    11°C min night temperature
  • 13 hours of daylight per day in September in Slovenia (Ljubljana)13
    13 hours of daylight per day
  • No heat & humidity in September in Slovenia (Ljubljana)0
    No heat & humidity
  • 127 mm monthly rainfall in September in Slovenia (Ljubljana)127
    127 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Slovenia (Ljubljana)5
    5 (Moderate) UV index

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The September weather guide for Slovenia (Ljubljana) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Slovenia destinations

Below are average maximum temperatures at popular countries, regions and places in Slovenia in September. Select a holiday destination to see more weather parameters.

All Slovenia destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Slovenia

How hot is it in Slovenia in September?

Daytime temperatures usually reach 21°C in Ljubljana, Slovenia in September, falling to 11°C at night.

How sunny is it in Slovenia in September?

There are normally 6 hours of bright sunshine each day in Ljubljana, Slovenia in September - that's 46% of daylight hours.

Does it rain in Slovenia in September?

There are usually 12 days with some rain in Ljubljana, Slovenia in September and the average monthly rainfall is 127mm.

Slovenia September sunrise & sunset times

Browse the sunrise and sunset times for Slovenia in September 2025. Select a month to view Slovenia sunrise and sunset times for the next 12 months. The Slovenia sunrise and sunset times shown below are for Ljubljana.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:23 18:40
Monday, 15th September 2025 05:40 18:13
Tuesday, 30th September 2025 05:59 17:44

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