S
M
T
W
T
F
S
26
93°
73°
27
93°
73°
28
92°
72°
29
93°
73°
30
93°
73°
31
91°
72°
1
90°
73°
2
88°
73°
3
90°
70°
4
90°
72°
5
92°
73°
6
92°
73°
7
91°
69°
8
93°
71°
9
92°
72°
10
90°
70°
11
92°
71°
12
93°
72°
13
93°
73°
14
92°
72°
15
92°
72°
16
91°
71°
17
92°
71°
18
92°
72°
19
91°
70°
20
92°
70°
21
87°
71°
22
87°
69°
23
88°
70°
24
91°
71°
25
92°
68°
26
91°
70°
27
91°
68°
28
90°
69°
29
88°
69°
30
87°
68°
31
86°
69°
1
87°
68°
2
91°
67°
3
86°
65°
4
85°
64°
5
86°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sumter
Sumter's August 2026 forecast shows daily high temperatures ranging from 85° to 93°, with overnight lows between 64° and 73°. The average high for August is 90° with an average low of 70°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Sumter. See also: September | October | November.
