Slovenia weather in September 2025
September
Slovenia weather in September 2025
September
Day
22 °C
Night
15 °C
Sea
22 °C
Precipitation
113 mm
in month
Rainy days
9 days
in month
Daylight
12 hours
average
Sunshine
7 hours
average
Humidity
71 %
Day
22 °C
Night
15 °C
Sea
22 °C
Precipitation
113 mm
in month
Rainy days
9 days
in month
Daylight
12 hours
average
Sunshine
7 hours
average
Humidity
71 %
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Weather overview and FAQs
Weather overview
In September in Slovenia, the average air temperature ranges from 22 °C (72 °F) during the day to 15 °C (59 °F) at night. There are 9 days of rain on average, where the rainfall is 113 mm (4.44 in).
Is September a good month to visit Slovenia?
There are good conditions for visiting in Slovenia in September. The temperature of the sea will be perfect at 22 °C (72 °F). There are only 9 days of rain in the whole month, so you can leave your umbrella at home. There are some people, who may feel a slight chill at 22 °C (72 °F), but others will feel perfectly fine. The temperature of 15 °C (59 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
What is the sea temperature in September in Slovenia?
The temperature of the sea in Slovenia in September is 22 °C (72 °F). This warm sea is nice for swimming, maybe cold for some, but most people can spend a long time in it.
What temperature can I expect during the day in Slovenia in September?
In Slovenia in September, the average daily temperatures will be 22 °C (72 °F). A comfortable temperature for most people, where it is neither too cold nor too hot, and a large number of activities can be carried out comfortably, including sunbathing by the water. Lighter clothing will be suitable - shorts, skirts, t-shirts, jackets; a light sweater and long trousers may also be useful.
What is the average number of rainy days in September in Slovenia?
There are 9 days, which are rainy in Slovenia in September, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 2.1 days of the week, or in general - 31 % days.
Is September part of the wet season in Slovenia?
No, there is no wet season in Slovenia in September - you can expect 9 days of rain during the month.
How heavy is the precipitation in September in Slovenia?
In Slovenia in September, there is 113 mm (4.44 in) rainfall, which means on average 4 mm (0.15 in) rainfall per day.
What is the night temperature in September in Slovenia?
The average night temperature in Slovenia in September is 15 °C (59 °F). This temperature is pleasant for a wide range of evening, night, and morning activities from sports to sitting outside in restaurants or evening walks.
How many hours of sun to expect in September in Slovenia?
There is an average length of sunshine of 7 hours per day in Slovenia in September.
Is September part of the dry season in Slovenia?
No, September is not a dry month in Slovenia, expect rain approximately 9 days in a month.
What is the humidity in September in Slovenia?
In September in Slovenia, expect humidity around 71 %.
Is the sea in Slovenia warmer in September than in August?
No, the sea is not warmer in Slovenia in September than in August.
Is the weather in Slovenia warmer in September than in August?
No, in Slovenia in September the temperature is not higher than in August.
How long is the day (from dawn till dusk) in Slovenia in September?
The length of daylight in Slovenia in September is 12 hours.
Is Slovenia rainier in September than in August?
Yes, in September in Slovenia it rains more than in August.
What is the temperature trend in September in Slovenia?
During September in Slovenia, the day temperatures are decreasing - from 25 °C (76 °F) at the beginning of the month to 20 °C (67 °F) at the end of the month.
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