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Koper-Capodistria (Koper)
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Weather in Koper-Capodistria for September 2026

Your guide to Koper-Capodistria weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Koper-Capodistria at the beginning of September is 28 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.

    • Rain 🌧️

  • The climate of Koper-Capodistria in September is notably wet, with an average of 13 rainy days, and a total of 157.8 mm of precipitation.

Average dry days
17
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/14°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Koper-Capodistria Weather September

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

Temperatures trend during September in Koper-Capodistria

See the weather trend as well as the moving average line

September weather in Koper-Capodistria 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° 0.2 mm 8
2 Sept. Sunny
Sunny
 28° /19° 5.6 mm 7
3 Sept. Patchy rain possible
Patchy rain possible
 28° /18° 1 mm 6
4 Sept. Patchy rain possible
Patchy rain possible
 29° /18° 0.2 mm 7
5 Sept. Patchy rain possible
Patchy rain possible
 29° /18° 3.9 mm 7
6 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 26° /17° 3.8 mm 6
7 Sept. Sunny
Sunny
 26° /16° 0 mm 7
8 Sept. Light rain shower
Light rain shower
 26° /16° 4.1 mm 6
9 Sept. Light rain shower
Light rain shower
 23° /16° 14.5 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 26.1 mm 6
11 Sept. Partly cloudy
Partly cloudy
 24° /15° 8.1 mm 6
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /12° 27.8 mm 5
13 Sept. Patchy rain possible
Patchy rain possible
 21° /12° 0.5 mm 5
14 Sept. Patchy light drizzle
Patchy light drizzle
 19° /11° 8 mm 5
15 Sept. Patchy rain possible
Patchy rain possible
 21° /12° 0 mm 5
16 Sept. Cloudy
Cloudy
 22° /11° 8.1 mm 5
17 Sept. Patchy rain possible
Patchy rain possible
 20° /12° 0.1 mm 5
18 Sept. Partly cloudy
Partly cloudy
 24° /13° 0 mm 7
19 Sept. Cloudy
Cloudy
 25° /16° 0 mm 6
20 Sept. Partly cloudy
Partly cloudy
 25° /16° 0 mm 7
21 Sept. Sunny
Sunny
 25° /14° 0 mm 7
22 Sept. Sunny
Sunny
 25° /14° 2.2 mm 6
23 Sept. Light rain shower
Light rain shower
 22° /14° 4.4 mm 5
24 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 20° /13° 22.9 mm 5
25 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 20° /11° 7.4 mm 5
26 Sept. Light rain shower
Light rain shower
 20° /13° 1.1 mm 5
27 Sept. Light rain shower
Light rain shower
 22° /14° 4.6 mm 5
28 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 1.5 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
 20° /10° 0.4 mm 5
30 Sept. Partly cloudy
Partly cloudy
 17° /9° 0.3 mm 5
Next
Important Notice
Our weather forecast for Koper-Capodistria 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-Capodistria forecast closer to your planned date for the most up-to-date weather information.
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Koper-Capodistria in September - FAQ

What are the expected maximum and minimum temperatures in Koper-Capodistria during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Koper-Capodistria during September?
Significant rainfall exceeding 157.8 mm is expected in Koper-Capodistria during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Koper-Capodistria during September?
The average wind speed in Koper-Capodistria during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Koper-Capodistria

Explore the daily rainfall trends and prepare for Koper-Capodistrias September weather 💧
Typically, Koper-Capodistria has 13 rainy days in September with a total of 157.8 mm of rainfall.

UV exposure in Koper-Capodistria during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Koper-Capodistria?

Get accurate weather forecasts for Koper-Capodistria, located at latitude 45.547 and longitude 13.729. Stay updated with localized weather information tailored for Koper-Capodistria.

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