Normal weather for Istria in September
It's warm in September in Istria with an average temperature of 25°C. Temperatures this month range from a low of 21°C to a high of 27°C. At night, you can expect temperatures between 11°C and 17°C.
In September, there is an average of 137 mm of precipitation, spread over 16 days. The wind speed is around 3 Bft, mostly coming from the East.
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Istria in September |
UK | ||
|---|---|---|---|
 Average Temperature |
25°C | 20°C | |
 High Temp |
27°C | 22°C | |
| Low Temp |
21°C | 17°C | |
 Total Precipitation |
137 mm | 44 mm | |
| Rainy Days |
16 days | 8 days | |
Curious about the climate in other parts of Croatia? Check out the weather and climate in places like Zagreb, Dubrovnik, Split, or have a look at other destinations in Croatia.
Start of September
The month of September starts in Istria with hot temperatures, averaging around 27°C during the day and nights close to 15°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-September
By mid-September, the average daytime temperature drops to around 26°C, with nights close to 15°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of September
By the end of September, the average daytime temperature in Istria will be around 23°C, with nights close to 12°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Is September a good time to visit Istria?
After some sun? Then September isn’t the best time to be in Istria. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Istria in September
With 31°C, Istria hit the highest temperature in the last 10 years in September 2021. The lowest daytime temperature in this month was 14°C in 2017. The extreme night temperatures ranged from a low of 3°C to a high of 22°C.
Check out the climate of Istria for all months and discover the best travel time
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Daily Temperature in September in Istria
This chart shows the average daily temperatures, both day and night, for each day in September in Istria, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Istria
The chart below shows the average daily precipitation in September for Istria, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 16 days of rain in Istria.
Daily UV Index in September in Istria
This chart shows the average daily UV index in September in Istria, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Istria Over the Years
This chart shows the average temperature in September in Istria, measured in degrees Celsius, over the past years.
Total Precipitation in September in Istria Over the Years
This chart shows the average precipitation in September in Istria, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Istria
Click on a specific day in September for detailed info on the typical weather on that day in Istria. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Istria
Have you been to Istria in September?
Share your weather experience in September in Istria.
Average Weather in Istria by Month
Click on a month below to see detailed weather info for Istria. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
