Weather in Istria for September 2026
In general, the average temperature in Istria at the beginning of September is 26.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.3 °C by the end of September.
The climate of Istria in September is notably wet, with an average of 11 rainy days, and a total of 98.1 mm of precipitation.
Is September a good time to visit Istria? check out the best time to travel to Istria page.
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Istria Weather September
What’s the Weather Like in Istria This September?
Temperatures trend during September in Istria
September weather in Istria day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 27° /21° | 0.7 mm | 6 | |
| 2 Sept. |  Sunny | 27° /21° | 2.5 mm | 7 | |
| 3 Sept. |  Overcast | 26° /20° | 0.6 mm | 6 | |
| 4 Sept. | Sunny | 26° /20° | 0 mm | 7 | |
| 5 Sept. | Sunny | 26° /20° | 2.2 mm | 7 | |
| 6 Sept. | Patchy rain possible | 25° /20° | 2.2 mm | 6 | |
| 7 Sept. | Sunny | 26° /20° | 0 mm | 6 | |
| 8 Sept. | Sunny | 26° /20° | 3.6 mm | 6 | |
| 9 Sept. | Sunny | 25° /20° | 5.6 mm | 6 | |
| 10 Sept. | Sunny | 25° /19° | 20.8 mm | 6 | |
| 11 Sept. | Sunny | 25° /20° | 0.6 mm | 6 | |
| 12 Sept. | Overcast | 24° /18° | 14.6 mm | 5 | |
| 13 Sept. |  Partly cloudy | 22° /18° | 1.1 mm | 6 | |
| 14 Sept. | Partly cloudy | 22° /17° | 2.7 mm | 5 | |
| 15 Sept. | Sunny | 22° /17° | 0 mm | 5 | |
| 16 Sept. | Sunny | 23° /17° | 3.5 mm | 5 | |
| 17 Sept. | Sunny | 21° /16° | 0.6 mm | 5 | |
| 18 Sept. | Partly cloudy | 23° /18° | 0.4 mm | 5 | |
| 19 Sept. |  Moderate rain at times | 24° /19° | 1.5 mm | 6 | |
| 20 Sept. | Partly cloudy | 23° /19° | 0.3 mm | 6 | |
| 21 Sept. | Sunny | 23° /19° | 2.8 mm | 6 | |
| 22 Sept. | Light rain shower | 23° /18° | 4.3 mm | 5 | |
| 23 Sept. | Light rain shower | 22° /18° | 6.6 mm | 5 | |
| 24 Sept. |  Light rain | 20° /17° | 13 mm | 5 | |
| 25 Sept. | Sunny | 21° /16° | 3.5 mm | 6 | |
| 26 Sept. | Patchy rain possible | 22° /17° | 0.5 mm | 5 | |
| 27 Sept. | Partly cloudy | 23° /19° | 2.2 mm | 6 | |
| 28 Sept. | Patchy rain possible | 22° /16° | 1.6 mm | 6 | |
| 29 Sept. | Partly cloudy | 21° /15° | 0.1 mm | 5 | |
| 30 Sept. | Sunny | 20° /15° | 0.2 mm | 5 | |
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Istria weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Patchy rain possible | Patchy rain possible |
| Temperatures | 28°/22° | 23°/19° | 19°/15° |
| Rainfall | 142 mm | 98 mm | 154 mm |
| Wind | 18.2 km/h | 20.3 km/h | 22.4 km/h |
| Humidity | 62% | 67% | 72% |
| Rainy days | 8 days | 11 days | 13 days |
| Dry days | 23 days | 19 days | 19 days |
Planning a trip to Istria? Discover the best time to visit
Istria in September - FAQ
What are the expected maximum and minimum temperatures in Istria during September?
How much rainfall should be expected in Istria during September?
What are the typical wind conditions in Istria during September?
September rainfall patterns in Istria
UV exposure in Istria during September
What to pack to Istria in September?
Mild · highs around 23 °C, frequent showers
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
👟 Footwear
🎒 Accessories
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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.