S
M
T
W
T
F
S
26
79°
62°
27
77°
64°
28
78°
64°
29
79°
65°
30
85°
65°
31
85°
67°
1
83°
67°
2
84°
68°
3
84°
67°
4
83°
66°
5
80°
66°
6
78°
65°
7
85°
66°
8
79°
65°
9
76°
64°
10
82°
59°
11
81°
59°
12
Hist. Avg.
76°
62°
13
Hist. Avg.
76°
62°
14
Hist. Avg.
76°
62°
15
Hist. Avg.
76°
62°
16
Hist. Avg.
76°
62°
17
Hist. Avg.
76°
62°
18
Hist. Avg.
76°
61°
19
Hist. Avg.
76°
61°
20
Hist. Avg.
75°
61°
21
Hist. Avg.
75°
61°
22
Hist. Avg.
75°
61°
23
Hist. Avg.
75°
60°
24
Hist. Avg.
75°
60°
25
Hist. Avg.
75°
60°
26
Hist. Avg.
75°
60°
27
Hist. Avg.
74°
60°
28
Hist. Avg.
74°
60°
29
Hist. Avg.
74°
59°
30
Hist. Avg.
74°
59°
31
Hist. Avg.
74°
59°
1
Hist. Avg.
74°
59°
2
Hist. Avg.
74°
58°
3
Hist. Avg.
73°
58°
4
Hist. Avg.
73°
58°
5
Hist. Avg.
73°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Onset
Onset's August 2026 forecast shows daily high temperatures ranging from 76° to 85°, with overnight lows between 59° and 68°. The average high for August is 81° with an average low of 65°. 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 Onset. See also: September | October | November.
