Sumy Weather in September
With daytime temperatures of 20°C (68°F) and nighttime lows of 9°C (48°F), September in Sumy brings pleasant temperatures during the day. The perfect weather makes it an appealing time to visit.
Rainfall in Sumy in September
This month experiences about 11 days of rain according to historical data, averaging 57 mm (2.2 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Sumy in September
September is a perfect month in Sumy, with 20°C (68°F) during the day and 9°C (48°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to 9°C (48°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Sumy.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ukraine, check out our Sumy's climate page.
Sumy Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
20°C (68°F)
Chance of Rain
38%
Precipitation
57 mm (2.2 in)
Rainy days
11 days
Humidity
76%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sumy typically drop from around 22°C (72°F) at the start of September to approximately 15°C (59°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Sumy in September
Browse day-by-day weather records for Sumy spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sumy historical weather extremes in September
Our historical data for Sumy spans 1976 to 2025, revealing these weather extremes.
- The hottest September day on record in Sumy reached 34°C (93°F) (September 2, 2015).
- Sumy registered its coldest September night on September 29, 1986, with temperatures dropping to -4°C (25°F).
Best Places in Ukraine in September
Find out more about the weather in Ukraine and which places have the best travel conditions in this month. See all of Ukraine in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Sumy in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days.What To Do in Sumy in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ukraine, check out our Sumy's climate page.
See the full Sumy climate overview or explore weather in Ukraine.
