Annual mean 18°C · wettest around July · prevailing wind W
Warmest
31.6 °C
Coldest
11.2 °C
Wettest
56%
Windiest
4.5 m/s
Prevailing
W
3.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Sumter over the whole year is 18°C. July is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 4°C. Sumter has no sharply defined rainy season: the chance of rain on a given day runs from 44% in April, the driest month, to 53% in July, the wettest. Winds in Sumter are highest in March, averaging 2.9 m/s (10 km/h), and lightest in August, at 2.0 m/s (7 km/h). The prevailing wind is from the W. The clearest skies in Sumter come in October, when the sky is typically 33% covered; February is the cloudiest month, at 46%.
Month by month Sumter 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
11°C
4°C
8°C
49%
40%
2.5 m/s
17
0
46
February
15°C
7°C
12°C
49%
46%
2.7 m/s
35
3
59
March
18°C
9°C
15°C
47%
41%
2.9 m/s
51
7
65
April
23°C
12°C
20°C
44%
34%
2.9 m/s
67
24
55
May
26°C
18°C
26°C
50%
42%
2.6 m/s
50
48
26
June
30°C
22°C
31°C
51%
41%
2.3 m/s
19
56
5
July
31°C
23°C
34°C
53%
39%
2.2 m/s
4
31
0
August
30°C
23°C
33°C
51%
45%
2.0 m/s
10
40
2
September
28°C
20°C
29°C
50%
39%
2.3 m/s
31
55
11
October
24°C
14°C
23°C
48%
33%
2.1 m/s
63
35
44
November
17°C
8°C
15°C
48%
37%
2.1 m/s
43
8
65
December
13°C
6°C
10°C
53%
43%
2.3 m/s
25
0
57
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 Sumter weather by season
Year round, Sumter has days of about 11°C at their warmest in January, its coolest month, and 31°C in July, its warmest; the coolest hours of the day run from 4°C to 23°C through the year, and the average temperature over the year is 18°C around the clock. Rain is most likely around July and least likely around April. 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.
Sumter weather in winterDecember to February
High 13°CLow 6°CRain 50%
Winter in Sumter has typical daily highs of about 13°C and lows of about 6°C, with a 50% chance of rain on a given day.
Sumter weather in springMarch to May
High 22°CLow 13°CRain 47%
Spring in Sumter has typical daily highs of about 22°C and lows of about 13°C, with a 47% chance of rain on a given day.
Sumter weather in summerJune to August
High 30°CLow 23°CRain 52%
Summer in Sumter has typical daily highs of about 30°C and lows of about 23°C, with a 52% chance of rain on a given day.
Sumter weather in autumnSeptember to November
High 23°CLow 14°CRain 49%
Autumn in Sumter has typical daily highs of about 23°C and lows of about 14°C, with a 49% chance of rain on a given day.
When is the rainy season in Sumter?
Sumter has no sharply defined rainy season: the chance of rain on a given day runs from 44% in April, the driest month, to 53% in July, the wettest.
What time of year is Sumter windiest?
Winds in Sumter are highest in March, averaging 2.9 m/s (10 km/h), and lightest in August, at 2.0 m/s (7 km/h). The prevailing wind is from the W.
What is the average temperature in Sumter year round?
The average temperature in Sumter over the whole year is 18°C. July is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 4°C.