S
M
T
W
T
F
S
26
91°
70°
27
92°
70°
28
91°
69°
29
93°
70°
30
93°
70°
31
92°
69°
1
92°
70°
2
94°
70°
3
92°
69°
4
92°
69°
5
93°
70°
6
93°
70°
7
92°
69°
8
90°
67°
9
91°
67°
10
87°
63°
11
88°
67°
12
90°
68°
13
91°
67°
14
92°
68°
15
91°
67°
16
92°
68°
17
92°
61°
18
91°
59°
19
83°
58°
20
82°
58°
21
82°
59°
22
83°
59°
23
83°
60°
24
84°
58°
25
84°
59°
26
86°
62°
27
88°
57°
28
83°
56°
29
82°
57°
30
84°
57°
31
86°
60°
1
88°
57°
2
81°
56°
3
80°
63°
4
86°
62°
5
85°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sullivan
Sullivan's August 2026 forecast shows daily high temperatures ranging from 80° to 94°, with overnight lows between 56° and 70°. The average high for August is 88° with an average low of 64°. 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 Sullivan. See also: September | October | November.
