If you plan to visit Ljubljana in September, the weather is typically alright, with an average high temperature of +72°F during the day and approximately 6 sunny days. Expect some rainy, though, as there are typically 11 rainy days in the month and around 125 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+72°F
Avg. max. temperature
+36°F
Min.
+90°F
Max.
125 mm
Total precipitation
80%
Avg. humidity
0 m/s
Avg. wind
6 ☀️
Sunny Days
10 ⛅️
Cloudy
11 🌦
Rainy
Our opinion: Ljubljana has OK weather in September.
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Average temperature in Ljubljana in September
Here are the expected maximum, average and minimum temperatures in Ljubljana for September based on the historical data.
Last Year
Historical Data
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
Ljubljana weather looks like this, on average, in September and the surrounding months.
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 speed in Ljubljana in September based on historical data.
Last Year
Historical Data
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
Amount of rainfall in mm during September in Ljubljana based on historical data.
Last Year
Historical Data
Typically, there is a 30% chance of rain on an average day in September, with total rainfall of approximately 122 mm. The maximum amount of rainfall per day is around 33 mm, which is moderate rain.On average, there are about 9 rainy days during September, so prepare to bring an umbrella.
September is one of the rainiest months in Ljubljana, here is a comparison with other months, total mm:
Ljubljana wettest month is September, where a typical day has a 37% chance of precipitation and 125 mm of rainfall per day. January, on the other hand, is the driest month with a mere 16% chance of precipitation and 44 mm of rainfall per day.
How was the weather last September in Ljubljana?
This is the weather in Ljubljana in September 2023:
1 September
☁️
+80°F
2 September
☀️
+84°F
3 September
☁️
+81°F
4 September
☀️
+78°F
5 September
☀️
+77°F
6 September
☀️
+80°F
7 September
☀️
+81°F
8 September
☀️
+82°F
9 September
☀️
+82°F
10 September
☀️
+84°F
11 September
☀️
+84°F
12 September
☀️
+84°F
13 September
☁️
+82°F
14 September
☁️
+74°F
15 September
☁️
+76°F
16 September
☀️
+78°F
17 September
🌫️
+80°F
18 September
☁️
+76°F
19 September
☁️
+73°F
20 September
☁️
+74°F
21 September
🌧️
+76°F
22 September
🌧️
+77°F
23 September
🌧️
+63°F
24 September
🌧️
+56°F
25 September
☁️
+67°F
26 September
☀️
+79°F
27 September
☀️
+78°F
28 September
☀️
+78°F
29 September
☀️
+75°F
30 September
☁️
+74°F
In September 2023 Ljubljana had 15 sunny days, 10 cloudy days, and 4 rainy days. The average maximum temperature was +77°F, with an absolute maximum of +84°F and a minimum of +55°F. The average humidity was 81%, with a maximum of 100% and a minimum of 48%. The average wind speed was 1 m/s, with a maximum of 25 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Ljubljana climate has changed over the last 43 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
Frequently asked questions about the weather in Ljubljana in September:
Is September a good time to visit Ljubljana?
It’s always a good time to visit Ljubljana, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Ljubljana in September?
September has mild temperatures in Ljubljana. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is Ljubljana rainy in September?
Ljubljana is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Ljubljana in September?
Usually, it’s not very sunny in Ljubljana in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
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.
