S
M
T
W
T
F
S
26
80°
54°
27
84°
59°
28
61°
52°
29
63°
46°
30
66°
43°
1
66°
46°
2
66°
45°
3
81°
43°
4
80°
62°
5
64°
47°
6
63°
44°
7
68°
42°
8
76°
50°
9
81°
52°
10
68°
49°
11
78°
43°
12
79°
50°
13
79°
56°
14
80°
50°
15
82°
67°
16
86°
70°
17
85°
69°
18
85°
74°
19
76°
54°
20
61°
54°
21
70°
56°
22
76°
62°
23
73°
59°
24
80°
56°
25
84°
56°
26
80°
59°
27
83°
64°
28
77°
66°
29
83°
68°
30
85°
68°
31
88°
69°
1
91°
66°
2
83°
61°
3
81°
64°
4
80°
61°
5
81°
63°
6
81°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oswego
Oswego's May 2026 forecast shows daily high temperatures ranging from 77° to 91°, with overnight lows between 61° and 69°. The average high for May is 83° 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 May weather will actually feel in Oswego. See also: June | July | August.
