Weather in Ljubljana in September
September in Ljubljana is mild enough that walking is the default. This is a city-break month more than a sea-holiday month.
In Slovenia, this is how Ljubljana actually wears September, not how a country centroid would. Compared with August and January, September sits in the middle of Ljubljana's year.
- Average temp
- 17°C
12–22°C
- Rainfall
- 159 mm
A wet month
- Sunshine
- 5.9 h
hours per day
What to expect
Daytime
Mild afternoons in Ljubljana are the prize in September. You can eat outside on the good days. You still want something for the breeze.
This is walking weather. Shade is useful, not essential the way it is in the hot months. A long outdoor day is a reasonable plan.
Rain
September is the wet side of the year in Ljubljana. Days can be heavy. Plans that cannot survive rain are the wrong plans.
This is not a reason to skip Ljubljana if you like the place. It is a reason to pack for weather and to stop treating every grey hour as a failed holiday.
Evening
Evenings are cooler. A layer helps after sunset.
What to pack
Rain jacket
A layer for cooler evenings
Where to stay in Ljubljana
Dates are a starting point for September.
Travel guides for Ljubljana
What to read before you book.
Average weather in Ljubljana
TemperatureRainfall
Similar weather in September
Other destinations whose September averages sit close to this one.
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FAQs about Ljubljana
Climate averages for Ljubljana, 1991–2020.
The best time to visit Ljubljana is between April and September, the most comfortable stretch of the year on these averages.
July is the hottest month, with an average around 22°C.
September is the wettest month, with about 159 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
