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Weather in Koper for September 2027

Your guide to Koper weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Koper at the beginning of September is 28.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.8 °C by the end of September.

    • Rain 🌧️

  • The climate of Koper in September is notably wet, with an average of 11 rainy days, and a total of 168.6 mm of precipitation.

    • More

  • Is September a good time to visit Koper? check out the best time to travel to Koper page.

Average dry days
19
Dry days
Average rainy days
11
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/15°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Koper Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
30°
2
Light rain
29°
3
Patchy rain possible
29°
4
Sunny
29°
5
Light rain
29°
6
Patchy light rain with thunder
27°
7
Sunny
28°
8
Light rain
28°
9
Moderate rain
24°
10
Heavy rain
23°
11
Moderate rain
23°
12
Moderate rain
23°
13
Patchy rain possible
22°
14
Light rain
21°
15
Patchy rain possible
22°
16
Light rain
23°
17
Moderate rain
21°
18
Light rain
24°
19
Light rain
25°
20
Partly cloudy
24°
21
Sunny
25°
22
Patchy rain possible
24°
23
Light rain
21°
24
Patchy light rain with thunder
20°
25
Patchy light rain with thunder
20°
26
Light rain shower
21°
27
Light rain
23°
28
Patchy rain possible
22°
29
Patchy rain possible
22°
30
Partly cloudy
19°

Temperatures trend during September in Koper

See the weather trend as well as the moving average line

September weather in Koper day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 30° /19° 0.1 mm 7
2 Sept. Light rain
Light rain
 29° /19° 3.7 mm 7
3 Sept. Patchy rain possible
Patchy rain possible
 29° /18° 0.7 mm 6
4 Sept. Sunny
Sunny
 29° /19° 0.1 mm 6
5 Sept. Light rain
Light rain
 29° /19° 2.6 mm 6.7
6 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 27° /17° 2.5 mm 6
7 Sept. Sunny
Sunny
 28° /17° 0 mm 6
8 Sept. Light rain
Light rain
 28° /18° 2.7 mm 6
9 Sept. Moderate rain
Moderate rain
 24° /17° 14.5 mm 4
10 Sept. Heavy rain
Heavy rain
 23° /16° 40.5 mm 4
11 Sept. Moderate rain
Moderate rain
 23° /15° 20.3 mm 4
12 Sept. Moderate rain
Moderate rain
 23° /13° 18.6 mm 5
13 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0.3 mm 5
14 Sept. Light rain
Light rain
 21° /13° 5.4 mm 4
15 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0 mm 5
16 Sept. Light rain
Light rain
 23° /13° 5.4 mm 5
17 Sept. Moderate rain
Moderate rain
 21° /13° 11.4 mm 4
18 Sept. Light rain
Light rain
 24° /14° 4.2 mm 5
19 Sept. Light rain
Light rain
 25° /16° 3.7 mm 5
20 Sept. Partly cloudy
Partly cloudy
 24° /16° 0 mm 5.3
21 Sept. Sunny
Sunny
 25° /15° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 24° /14° 1.4 mm 5
23 Sept. Light rain
Light rain
 21° /13° 2.9 mm 5
24 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 20° /13° 17.3 mm 4
25 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 20° /12° 5.1 mm 4.9
26 Sept. Light rain shower
Light rain shower
 21° /12° 0.7 mm 4
27 Sept. Light rain
Light rain
 23° /13° 3 mm 4.7
28 Sept. Patchy rain possible
Patchy rain possible
 22° /12° 1 mm 4.6
29 Sept. Patchy rain possible
Patchy rain possible
 22° /12° 0.3 mm 4
30 Sept. Partly cloudy
Partly cloudy
 19° /10° 0.2 mm 4
Next
Important Notice
Our weather forecast for Koper in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Koper forecast closer to your planned date for the most up-to-date weather information.
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Koper in September - FAQ

What are the expected maximum and minimum temperatures in Koper during September?
During September, expect a variety of temperatures with highs around 24° and lows near 15°, suitable for diverse activities and preferences.

How much rainfall should be expected in Koper during September?
Significant rainfall exceeding 168.6 mm is expected in Koper during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Koper during September?
The average wind speed in Koper during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Koper

Explore the daily rainfall trends and prepare for Kopers September weather 💧
Typically, Koper has 11 rainy days in September with a total of 168.6 mm of rainfall.

UV exposure in Koper during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Get accurate weather forecasts for Koper, located at latitude 45.547 and longitude 13.729. Stay updated with localized weather information tailored for Koper.

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