S
M
T
W
T
F
S
26
85°
69°
27
79°
66°
28
79°
64°
29
80°
65°
30
85°
70°
31
86°
68°
1
83°
66°
2
84°
67°
3
87°
61°
4
80°
62°
5
79°
65°
6
80°
62°
7
79°
60°
8
80°
60°
9
80°
59°
10
81°
67°
11
82°
64°
12
82°
64°
13
85°
59°
14
79°
59°
15
81°
61°
16
80°
60°
17
77°
60°
18
78°
59°
19
79°
59°
20
80°
61°
21
82°
66°
22
83°
67°
23
85°
68°
24
86°
67°
25
87°
63°
26
85°
60°
27
81°
64°
28
84°
66°
29
81°
58°
30
82°
57°
31
78°
55°
1
76°
58°
2
75°
57°
3
77°
57°
4
76°
56°
5
74°
56°
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 74° to 87°, with overnight lows between 55° and 70°. The average high for August is 81° with an average low of 62°. 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.
