S
M
T
W
T
F
S
26
59°
33°
27
72°
32°
28
66°
53°
29
60°
44°
30
49°
36°
1
53°
32°
2
47°
37°
3
55°
34°
4
74°
45°
5
72°
46°
6
47°
41°
7
53°
33°
8
54°
35°
9
65°
35°
10
55°
35°
11
53°
31°
12
57°
29°
13
69°
43°
14
51°
41°
15
62°
42°
16
77°
38°
17
77°
56°
18
89°
60°
19
78°
53°
20
59°
44°
21
52°
42°
22
62°
51°
23
57°
49°
24
58°
51°
25
63°
55°
26
64°
54°
27
63°
55°
28
63°
55°
29
66°
54°
30
68°
59°
31
67°
60°
1
66°
63°
2
67°
57°
3
67°
58°
4
69°
58°
5
67°
57°
6
69°
58°
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 52° to 78°, with overnight lows between 42° and 63°. The average high for May is 64° with an average low of 54°. 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.
