Ljubljana Weather in September

September in Ljubljana brings pleasant temperatures, with daytime highs of 21°C (70°F) and nights around 11°C (52°F). It's also the wettest month of the year, so an umbrella is a must.

Rainfall in Ljubljana in September

The month brings the most rain, so be prepared with an umbrella for the occasional shower. Past climate data indicates that roughly 13 days will see rain, totalling around 132 mm (5.2 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Ljubljana in September

September in Ljubljana brings pleasant temperatures, with highs of 21°C (70°F) and nights around 11°C (52°F). Conditions are often most pleasant around the middle of the day. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Ljubljana in September

The month brings about 182 hours of sunlight, offering a comfortable mix of sun and overcast.

Wind Speed in Ljubljana in September

Wind speeds average 2 m/s (4 knots) during September. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.

If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August and September typically offer the best circumstances for Ljubljana.

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For a detailed overview over the year and the best time to visit Slovenia, check out our Ljubljana's climate page.

Ljubljana Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 21°C (70°F)  

Chance of Rain 42%  

Precipitation 132 mm (5.2 in)  

Rainy days 13 days  

Humidity 72%  

Windspeed 2 m/s (4 knots)  

Sunshine 182 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Ljubljana typically drop from around 23°C (73°F) at the start of September to approximately 19°C (66°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 12°C (54°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Ljubljana in September

Browse day-by-day weather records for Ljubljana spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Ljubljana historical weather extremes in September

According to our 49 years of weather records for Ljubljana, the following extremes were recorded between 1976 and 2025.

• The hottest September day on record in Ljubljana reached 33°C (91°F) (September 4, 2011).
• The coldest September day was on September 18, 1977, with a maximum of 7°C (45°F).
• The lowest overnight temperature recorded in September was -1°C (30°F) (September 29, 2008).

What to Wear in Ljubljana in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Ljubljana in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Slovenia, check out our Ljubljana's climate page.

More climate data for Ljubljana

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Ljubljana climate overview or explore weather in Slovenia.