S
M
T
W
T
F
S
26
86°
66°
27
85°
66°
28
86°
65°
29
86°
65°
30
85°
60°
31
78°
58°
1
78°
62°
2
77°
62°
3
79°
61°
4
83°
65°
5
84°
65°
6
85°
64°
7
82°
62°
8
78°
61°
9
79°
62°
10
80°
59°
11
82°
63°
12
83°
64°
13
86°
65°
14
87°
64°
15
85°
66°
16
87°
63°
17
86°
56°
18
78°
55°
19
76°
55°
20
76°
54°
21
77°
54°
22
77°
55°
23
78°
56°
24
78°
56°
25
80°
57°
26
83°
61°
27
83°
55°
28
77°
54°
29
77°
54°
30
78°
57°
31
79°
55°
1
81°
54°
2
77°
53°
3
76°
58°
4
80°
61°
5
83°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Oswego
Oswego's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 53° and 66°. The average high for August is 81° with an average low of 60°. 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 Oswego. See also: September | October | November.
