S
M
T
W
T
F
S
26
88°
73°
27
93°
72°
28
97°
70°
29
95°
73°
30
N/A
31
93°
72°
1
94°
72°
2
88°
72°
3
84°
73°
4
89°
72°
5
89°
73°
6
90°
74°
7
89°
73°
8
91°
69°
9
90°
70°
10
89°
70°
11
88°
71°
12
89°
69°
13
90°
67°
14
87°
71°
15
87°
70°
16
85°
68°
17
85°
67°
18
90°
71°
19
90°
68°
20
85°
66°
21
85°
68°
22
87°
70°
23
89°
70°
24
84°
69°
25
85°
69°
26
87°
66°
27
84°
65°
28
85°
65°
29
87°
66°
30
88°
67°
31
88°
68°
1
87°
70°
2
89°
70°
3
85°
69°
4
83°
69°
5
83°
66°
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 83° to 94°, with overnight lows between 65° and 74°. The average high for August is 88° with an average low of 69°. 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.
