Annual mean 9°C · wettest around July · prevailing wind SW
Warmest
26.0 °C
Coldest
-4.9 °C
Wettest
100%
Windiest
4.2 m/s
Prevailing
SW
3.6 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Sumy over the whole year is 9°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -6°C. The rainy (wet) season in Sumy runs from July, peaking in July with a 55% chance of rain on a given day. The dry season is November to April; December is the driest month, at 20%. Winds in Sumy are highest in January, averaging 3.5 m/s (13 km/h), and lightest in July, at 2.3 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Sumy come in August, when the sky is typically 48% covered; December is the cloudiest month, at 92%.
Month by month Sumy climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-4°C
-6°C
-10°C
25%
85%
3.5 m/s
0
0
0
February
-1°C
-4°C
-6°C
30%
77%
3.4 m/s
0
0
0
March
5°C
-0°C
-1°C
31%
76%
3.4 m/s
0
0
12
April
14°C
6°C
9°C
37%
65%
3.3 m/s
18
1
56
May
18°C
10°C
15°C
42%
62%
2.8 m/s
52
4
74
June
23°C
15°C
21°C
33%
59%
2.7 m/s
68
30
51
July
26°C
17°C
25°C
55%
54%
2.3 m/s
61
49
32
August
26°C
16°C
24°C
28%
48%
2.4 m/s
67
47
35
September
19°C
10°C
16°C
45%
58%
2.5 m/s
54
9
69
October
11°C
5°C
7°C
41%
68%
2.8 m/s
12
0
52
November
3°C
0°C
-2°C
37%
82%
3.3 m/s
0
0
9
December
-1°C
-3°C
-6°C
20%
92%
3.3 m/s
0
0
0
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Sumy weather by season
Year round, Sumy has days of about -4°C at their warmest in January, its coolest month, and 26°C in July, its warmest; the coolest hours of the day run from -6°C to 17°C through the year, and the average temperature over the year is 9°C around the clock. Rain is most likely around July and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Sumy weather in winterDecember to February
High -2°CLow -4°CRain 25%
Winter in Sumy has typical daily highs of about -2°C and lows of about -4°C, with a 25% chance of rain on a given day.
Sumy weather in springMarch to May
High 12°CLow 5°CRain 37%
Spring in Sumy has typical daily highs of about 12°C and lows of about 5°C, with a 37% chance of rain on a given day.
Sumy weather in summerJune to August
High 25°CLow 16°CRain 39%
Summer in Sumy has typical daily highs of about 25°C and lows of about 16°C, with a 39% chance of rain on a given day.
Sumy weather in autumnSeptember to November
High 11°CLow 5°CRain 41%
Autumn in Sumy has typical daily highs of about 11°C and lows of about 5°C, with a 41% chance of rain on a given day.
When is the rainy season in Sumy?
The rainy (wet) season in Sumy runs from July, peaking in July with a 55% chance of rain on a given day. The dry season is November to April; December is the driest month, at 20%.
What time of year is Sumy windiest?
Winds in Sumy are highest in January, averaging 3.5 m/s (13 km/h), and lightest in July, at 2.3 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Sumy year round?
The average temperature in Sumy over the whole year is 9°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -6°C.