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SloveniaThe weather in September in Koper
It's warm in September in Koper with an average temperature of 25°C. Temperatures this month range from a low of 22°C to a high of 28°C. At night, you can expect temperatures between 13°C and 18°C.
Looking for sun? September isn’t a good month to be in Koper. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Koper, Slovenia. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 32°C in 2016, Koper reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 14°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 7°C to a highest value of 24°C.
Rainfall amount
In September, there is an average of 115 mm of precipitation, spread over 15 days. The wind speed is around 3 Bft, mostly coming from the East.
Daily weather in September for Koper
Click on any day in September to get detailed info about the usual weather on that day in Koper. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Koper | New York | |
|---|---|---|
| Average temperature | 25°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 13°C | -5°C |
| Total precipitation | 115 mm | 57 mm |
| Rainy days | 15 days | 9 days |
Start of September
The month of September starts in Koper with hot temps, averaging around 27°C during the day and nights around 17°C.
Mid September
By mid-September, daytime temps stay steady at around 27°C, with nights around 17°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Koper is around 24°C, while nighttime temps are about 14°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
UV index
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.
Check out the climate of Koper for all months and discover the best travel time
Curious about the weather in other parts of Slovenia? Check out the climate and weather for spots like Ljubljana, Bled, Bohinj, or explore other destinations in Slovenia.
Temperature charts
These charts show the average temperatures in September in Koper, Slovenia. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Koper
Temperature in September in Koper over the years
Precipitation charts
These charts show the average amount of precipitation in September in Koper, Slovenia. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Koper
Total precipitation in September in Koper over the years
Daily UV index in September in Koper
This chart shows the average daily UV index in September in Koper, 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.
Weather experiences in September in Koper
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Average weather in Koper by month
Click on a month below to see detailed weather info for Koper. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.