Istria Weather in September
What's the weather like in Istria (Constanţa) in September 2025?
The climate in Istria during September can be summarized as warm and reasonably dry.
September is in the fall / autumn in Istria and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 14°C (57°F) is normal.
| Daytime temperature | 22.6°C 72.7°F |
|---|---|
| Nightly temperature | 13.8°C 56.8°F |
| Average temperature | 18.2°C 64.8°F |
| Daily sunshine | 6.9 hrs |
| Avg rainfall | 33 mm 1.3 ins |
| Rainy days | 6 days |
| Sea temperature | 21.8°C 71.3°F |
| Humidity | 76% |
| Windspeed | 14.4kph 9 mph |
On average September is the 6th driest month of the year in Istria with around 33mm 1.3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.9 hours of sunshine per day.
September temperatures in Istria
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Istria in September 2025.
Other monthly averages
Best places to visit in September
Istria weather stats
| Hottest month: | July | 26.2°C 79.2°F |
|---|---|---|
| Driest month: | March | 26mm 1ins |
| Sunniest month: | August | 8.6hrs |
| Coldest month: | January | 3.1°C 37.6°F |
| Wettest month: | June | 43mm 1.7ins |
© Google