Ljubljana Weather in September
In September, Ljubljana averages a high of 22°C (71°F) and a low of 11°C (53°F), from 54 years of daily records (1971–2025).
22°C
Average high
71°F
11°C
Average low
53°F
33°C
Record high
92°F · September 4, 2011
-1°C
Record low
31°F · September 29, 1977
What September Is Like in Ljubljana
- 5 of the 10 warmest Septembers on record in Ljubljana have come since 2010.
- The coldest September reading, -1°C (31°F) on September 29, 1977, has not been matched in 48 years.
- September in Ljubljana has become 1.4°C (2.5°F) warmer on average: the 2010–2024 average against 1970–1989.
- September is the wettest month of the year in Ljubljana, averaging 149 mm of rain.
At least 1 mm of rain falls on 30% of September days, and the month averages 149 mm in total.
Warmest: 2011 (26.4°C)Latest: 2024 (23.9°C)10-year averageLong-run average (21.8°C)
Look Up a Day in September
See the weather in Ljubljana on any September date, year by year.
Source: NOAA GHCN-Daily, Ljubljana Bezigrad (1971–2025). Averages cover 1971–2025. How we compute this