Istria
September
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.
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23
Dry days
7
Rainy days
0
Snow days
25°/20°
Temperatures
20 km/h
Avg max wind
65 %
Avg humidity
Istria in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  28° | 3  27° | 4  27° | 5 26° | 6 26° | 7 26° |
| 8 27° | 9 26° | 10 26° | 11 26° | 12 24° | 13 20° | 14 22° |
| 15 21° | 16 22° | 17 21° | 18 22° | 19  22° | 20  22° | 21 23° |
| 22 22° | 23 21° | 24 19° | 25 21° | 26 23° | 27 24° | 28 23° |
| 29 21° | 30 22° |
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Temperatures trend during September in Istria
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 28° /22° | 1 mm | 7 | |
| 2 Sept. | Sunny | 28° /22° | 0 mm | 8 | |
| 3 Sept. | Overcast | 27° /21° | 0 mm | 7 | |
| 4 Sept. | Partly cloudy | 27° /21° | 0 mm | 7 | |
| 5 Sept. | Sunny | 26° /20° | 3.2 mm | 7 | |
| 6 Sept. | Sunny | 26° /20° | 3.3 mm | 6 | |
| 7 Sept. | Sunny | 26° /21° | 0 mm | 7 | |
| 8 Sept. | Sunny | 27° /21° | 5.3 mm | 7 | |
| 9 Sept. | Sunny | 26° /20° | 7.3 mm | 6 | |
| 10 Sept. | Sunny | 26° /20° | 0 mm | 7 | |
| 11 Sept. | Sunny | 26° /20° | 0.1 mm | 7 | |
| 12 Sept. | Overcast | 24° /18° | 21.6 mm | 6 | |
| 13 Sept. | Partly cloudy | 20° /17° | 1.6 mm | 6 | |
| 14 Sept. | Partly cloudy | 22° /17° | 0.8 mm | 6 | |
| 15 Sept. | Sunny | 21° /17° | 0.1 mm | 5 | |
| 16 Sept. | Sunny | 22° /17° | 0.9 mm | 6 | |
| 17 Sept. | Sunny | 21° /16° | 0.1 mm | 5 | |
| 18 Sept. | Partly cloudy | 22° /18° | 0.6 mm | 5 | |
| 19 Sept. | Moderate rain at times | 22° /19° | 2.3 mm | 5 | |
| 20 Sept. | Patchy light drizzle | 22° /19° | 0.4 mm | 6 | |
| 21 Sept. | Light rain shower | 23° /18° | 4.1 mm | 6 | |
| 22 Sept. | Light rain shower | 22° /18° | 5.8 mm | 6 | |
| 23 Sept. | Light rain shower | 21° /17° | 8.5 mm | 6 | |
| 24 Sept. | Light rain | 19° /17° | 12.3 mm | 5 | |
| 25 Sept. | Sunny | 21° /16° | 4.9 mm | 6 | |
| 26 Sept. | Sunny | 23° /18° | 0.4 mm | 6 | |
| 27 Sept. | Partly cloudy | 24° /20° | 2.9 mm | 6 | |
| 28 Sept. | Sunny | 23° /17° | 1.1 mm | 6 | |
| 29 Sept. | Partly cloudy | 21° /16° | 0.1 mm | 5 | |
| 30 Sept. | 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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