S
M
T
W
T
F
S
26
51°
39°
27
52°
38°
28
53°
43°
29
53°
39°
30
52°
39°
1
54°
41°
2
55°
38°
3
54°
39°
4
59°
49°
5
65°
43°
6
56°
40°
7
60°
50°
8
68°
51°
9
68°
50°
10
67°
45°
11
57°
44°
12
58°
44°
13
59°
50°
14
60°
47°
15
60°
50°
16
61°
52°
17
62°
52°
18
66°
47°
19
67°
44°
20
64°
45°
21
63°
44°
22
62°
44°
23
63°
43°
24
63°
46°
25
65°
52°
26
66°
51°
27
69°
45°
28
65°
47°
29
65°
57°
30
69°
48°
31
67°
49°
1
65°
55°
2
67°
49°
3
68°
50°
4
68°
59°
5
73°
50°
6
70°
51°
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 51° to 73°, with overnight lows between 38° and 59°. The average high for May is 62° with an average low of 47°. 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.
