Sumy Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sumy.
Climate overview of Sumy
The climate in Sumy, Sumy Oblast, Ukraine, is marked by large temperature swings across the seasons, ranging from 27°C (81°F) in July to -1°C (30°F) in January.
With around 666 mm (26 in) of annual rain/snowfall, the city has moderate precipitation levels. July is the wettest month and February the driest. It also has warm summers and very cold winters.
Sumy Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sumy - and find the best time to visit.
Monthly Temperature in Sumy
In Sumy, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a comfortable 27°C (81°F) in July to a very cold -1°C (30°F) in the coolest month, January.
Nights vary from 16°C (61°F) in July to around -7°C (19°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sumy
On average, Sumy receives a reasonable amount of rain/snowfall, with an annual precipitation of 666 mm (26 in). Precipitation levels in Sumy remain relatively steady throughout the year. July has the most rain, with 76 mm (3 in) over 14 days. In the driest month February, this drops slightly to 47 mm (1.9 in), making the city's climate fairly predictable. For more details, please visit our Sumy Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Humidity in Sumy by Month
The relative humidity is high throughout the year in Sumy.
The city experiences its highest humidity in November, reaching 86%. In May, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Sumy
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July, August and September
- Warmest weather: July and August
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Sumy
What is the best time to visit Sumy?
May, June, July, August and September typically offer the most optimal weather in Sumy. In contrast, January, February, March, November and December tend to have less optimal conditions. Sumy has warm summers and very cold winters.
What temperatures can I expect in Sumy?
Daytime highs range from -1°C (30°F) in January to 27°C (81°F) in July. Nighttime lows range from -7°C (19°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Sumy get?
Annual rainfall is around 666 mm (26 in). July is the wettest month with 76 mm (3 in), while February is the driest with 47 mm (1.9 in).
Sumy 3-Day Forecast
Sumy on the map
Sumy is highlighted - select any city to see its climate.
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