Weather in Ljubljana in September 2025
Average weather
Average temperature in Ljubljana in September
Going from a maximum of +84°F during the day to a minimum of +48°F during the night, the temperature in September averages around +77°F.
The average maximum temperature goes down 20% by the end of the month, compared with the beginning of the month, from +81°F to +73°F.
Is Ljubljana warm or cold in September?
Ljubljana is typically mild in September.
Maximum temperatures go down compared to the previous month from +79°F to +72°F. The minimum temperature also goes down from +61°F to +54°F.
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 Ljubljana:
Climate in Ljubljana in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +79°F | +72°F | +61°F | ||||
| Min. temperature | ||||||
| +43°F | +36°F | +23°F | ||||
| Max. temperature | ||||||
| +102°F | +90°F | +81°F | ||||
| Rainfall | ||||||
| 118 mm | 125 mm | 113 mm | ||||
| Wind | ||||||
| 1 m/s | 0 m/s | 0 m/s | ||||
| Humidity | ||||||
| 74% | 80% | 84% | ||||
| Air pressure | ||||||
| 1015 HPa | 1017 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 8 | 6 | 4 | ||||
| Cloudy days | ||||||
| 6 | 10 | 13 | ||||
| Rainy days | ||||||
| 10 | 11 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +79°F in the day, the average maximum temperature lowers to +72°F. Prepare for more rain. Average rainfall goes from 118 mm to 125 mm. Humidity rises from 74% to 80%. Winds are calmer in comparison to August, going down from 1 m/s to 0 m/s on average. The days becoming less sunny, going from 8 sunny days in August to 6 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Ljubljana is gradually decreasing during September, going from 2 m/s to 0 m/s over the course of the month.
Rain
How was the weather last September in Ljubljana?
Climate Change Over the Years
The climate in Ljubljana in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1980 (+56°F) and the highest in 2022 (+64°F). The driest year was 2011 with only 724 mm of rainfall, and the wettest year was 2023 with 1873 mm.
FAQ
Is September a good time to visit Ljubljana?
Can you sunbathe in Ljubljana in September?
Is Ljubljana rainy in September?
Is it sunny in Ljubljana in September?
Monthly weather in Ljubljana
Source of the data
For this page, we’ve looked at the typical weather in Ljubljana, 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.