S
M
T
W
T
F
S
26
66°
41°
27
70°
51°
28
63°
49°
29
59°
35°
30
59°
33°
1
51°
32°
2
57°
40°
3
65°
43°
4
75°
49°
5
56°
41°
6
56°
38°
7
54°
39°
8
60°
42°
9
64°
43°
10
65°
47°
11
68°
46°
12
67°
50°
13
68°
53°
14
69°
51°
15
71°
50°
16
72°
56°
17
73°
53°
18
67°
52°
19
72°
56°
20
71°
56°
21
70°
47°
22
66°
46°
23
66°
48°
24
67°
48°
25
67°
49°
26
68°
49°
27
67°
50°
28
68°
49°
29
69°
54°
30
70°
59°
31
75°
55°
1
71°
55°
2
74°
60°
3
77°
60°
4
79°
61°
5
79°
62°
6
80°
63°
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 54° to 80°, with overnight lows between 38° and 63°. The average high for May is 68° with an average low of 51°. 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.
