Weather in September 2025

Koper weather in September 2025

The temperatures in Koper in September are comfortable with low of 15°C and and high up to 24°C.

You can expect rain for roughly half of the month of September in Koper. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.

Our weather forecast can give you a great sense of what weather to expect in Koper in September 2025.

If you’re planning to visit Koper in the near future, we highly recommend that you review the 14 day weather forecast for Koper before you arrive.

Temperatures
Temperatures
24° / 15°
Rainy Days
Rainy Days
9
Snowy Days
Snowy Days
0
Dry Days
Dry Days
21
Rainfall
Rainfall
240
mm
11.0
Sun Hours
11.0
Hrs

Koper annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January 7° / 0° 8 22 2 154 mm
Awful
February 9° / 1° 8 18 2 204 mm
Awful
March 12° / 3° 8 22 1 161 mm
Bad
April 17° / 8° 7 23 0 143 mm
Ok
May 21° / 11° 11 20 0 219 mm
Ok
June 25° / 16° 10 20 0 206 mm
Good
July 28° / 19° 8 23 0 166 mm
Good
August 28° / 20° 7 24 0 148 mm
Good
September 24° / 15° 9 21 0 240 mm
Good
October 18° / 10° 7 24 0 198 mm
Ok
November 13° / 6° 10 20 0 272 mm
Bad
December 9° / 2° 8 22 1 224 mm
Bad
Temperatures in Koper in September
Rain in Koper in September

Recommended Hotels in Koper

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That’s why we run our special tools and found the best hotels in Koper. Click on hotel for more details.

Weather in Koper in September - FAQ

What is the average temperature in Koper in September?
The average temperature in Koper in September is 15/24° C.
What is the chance of rain in Koper in September?
On average, there are 9 rainy days in Koper during September.
Weather wise, is September a good time to visit Koper?
The weather in Koper in September is good.
Can it snow in Koper in September?
On average, there are 0 snowy days in Koper in September.
More about the weather in Koper