Temperatures in September
It's pleasantly warm in September in Sumy with an average temperature of 21°C. Temperatures this month range from a low of 16°C to a high of 27°C. At night, you can expect temperatures between 7°C and 13°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Sumy in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Sumy with warm temperatures, averaging around 25°C during the day and nights close to 12°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Mid-September
By mid-September, the average daytime temperature drops to around 22°C, with nights close to 10°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of September
By the end of September, the average daytime temperature in Sumy will be around 19°C, with nights close to 8°C. A shower might show up, but overall the weather will be dry and sunny.
Precipitation in September
In September, there is an average of 36 mm of precipitation, spread over 6 days. The wind speed is around 3 Bft, mostly coming from the South.
The average precipitation chance is 20% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Sumy. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Sumy in September |
London | ||
|---|---|---|---|
 Average Temperature |
21°C | 20°C | |
 High Temp |
27°C | 22°C | |
| Low Temp |
16°C | 17°C | |
 Total Precipitation |
36 mm | 44 mm | |
| Rainy Days |
6 days | 8 days | |
August
UV index
The UV index is a maximum of 7 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.
Is September a good time to visit Sumy?
Want nice weather? Then September is a great time to be in Sumy. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for Sumy in September
With 36°C, Sumy hit the highest temperature in the last 10 years in September 2015. The lowest daytime temperature in this month was 8°C in 2021. The extreme night temperatures ranged from a low of -2°C to a high of 20°C.
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Daily Temperature in September in Sumy
This chart shows the average daily temperatures, both day and night, for each day in September in Sumy, 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 Sumy
The chart below shows the average daily precipitation in September for Sumy, 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 6 days of rain in Sumy.
Daily UV Index in September in Sumy
This chart shows the average daily UV index in September in Sumy, 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 Sumy Over the Years
This chart shows the average temperature in September in Sumy, measured in degrees Celsius, over the past years.
Total Precipitation in September in Sumy Over the Years
This chart shows the average precipitation in September in Sumy, 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 Sumy
Click on a specific day in September for detailed info on the typical weather on that day in Sumy. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Sumy
Have you been to Sumy in September?
Share your weather experience in September in Sumy.
Average Weather in Sumy by Month
Click on a month below to see detailed weather info for Sumy. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
