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Weather in Istria for September 2025

Your guide to Istria weather in September - trends and predictions
  • In general, the average temperature in Istria at the beginning of September is 26.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.9 °C by the end of September.

  • Istria sees moderate rainfall in September, averaging 7 rainy days.

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

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/20°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
65 %
Avg humidity

Istria in September average weather

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Temperatures trend during September in Istria

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
28° /22° 1 mm 7
2 Sept. Sunny
Sunny
28° /22° 0 mm 8
3 Sept. Overcast
Overcast
27° /21° 0 mm 7
4 Sept. Partly cloudy
Partly cloudy
27° /21° 0 mm 7
5 Sept. Sunny
Sunny
26° /20° 3.2 mm 7
6 Sept. Sunny
Sunny
26° /20° 3.3 mm 6
7 Sept. Sunny
Sunny
26° /21° 0 mm 7
8 Sept. Sunny
Sunny
27° /21° 5.3 mm 7
9 Sept. Sunny
Sunny
26° /20° 7.3 mm 6
10 Sept. Sunny
Sunny
26° /20° 0 mm 7
11 Sept. Sunny
Sunny
26° /20° 0.1 mm 7
12 Sept. Overcast
Overcast
24° /18° 21.6 mm 6
13 Sept. Partly cloudy
Partly cloudy
20° /17° 1.6 mm 6
14 Sept. Partly cloudy
Partly cloudy
22° /17° 0.8 mm 6
15 Sept. Sunny
Sunny
21° /17° 0.1 mm 5
16 Sept. Sunny
Sunny
22° /17° 0.9 mm 6
17 Sept. Sunny
Sunny
21° /16° 0.1 mm 5
18 Sept. Partly cloudy
Partly cloudy
22° /18° 0.6 mm 5
19 Sept. Moderate rain at times
Moderate rain at times
22° /19° 2.3 mm 5
20 Sept. Patchy light drizzle
Patchy light drizzle
22° /19° 0.4 mm 6
21 Sept. Light rain shower
Light rain shower
23° /18° 4.1 mm 6
22 Sept. Light rain shower
Light rain shower
22° /18° 5.8 mm 6
23 Sept. Light rain shower
Light rain shower
21° /17° 8.5 mm 6
24 Sept. Light rain
Light rain
19° /17° 12.3 mm 5
25 Sept. Sunny
Sunny
21° /16° 4.9 mm 6
26 Sept. Sunny
Sunny
23° /18° 0.4 mm 6
27 Sept. Partly cloudy
Partly cloudy
24° /20° 2.9 mm 6
28 Sept. Sunny
Sunny
23° /17° 1.1 mm 6
29 Sept. Partly cloudy
Partly cloudy
21° /16° 0.1 mm 5
30 Sept. Sunny
Sunny
22° /15° 0 mm 6
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Important Notice
Our weather forecast for Istria 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 Istria forecast closer to your planned date for the most up-to-date weather information.

Istria in September - FAQ

What are the expected maximum and minimum temperatures in Istria during September?
During September, expect a variety of temperatures with highs around 25° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Istria during September?
In September, Istria can expect light to moderate rainfall, totaling 49.6 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Istria during September?
The average wind speed in Istria during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Istria in September?

As you prepare for your trip to Istria in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Istria, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
    • Rain Gear: Lightweight, waterproof clothing
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Umbrellas/Raincoats: For rainy days

September rainfall patterns in Istria

Explore the daily rainfall trends and prepare for Istrias September weather 💧

UV exposure in Istria during September

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

Get accurate weather forecasts for Istria, located at latitude 44.868 and longitude 13.848. Stay updated with localized weather information tailored for Istria.

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