S
M
T
W
T
F
S
26
43°
17°
27
47°
23°
28
57°
20°
29
55°
26°
30
65°
23°
1
71°
26°
2
71°
36°
3
79°
29°
4
54°
34°
5
49°
23°
6
58°
15°
7
69°
26°
8
77°
35°
9
69°
33°
10
75°
41°
11
81°
49°
12
77°
40°
13
88°
36°
14
73°
52°
15
70°
39°
16
67°
33°
17
54°
44°
18
46°
30°
19
67°
21°
20
66°
42°
21
65°
36°
22
70°
42°
23
78°
48°
24
84°
52°
25
93°
63°
26
91°
62°
27
79°
57°
28
78°
55°
29
78°
57°
30
79°
59°
31
82°
58°
1
81°
59°
2
73°
50°
3
72°
56°
4
73°
54°
5
73°
56°
6
72°
57°
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 65° to 93°, with overnight lows between 36° and 63°. The average high for May is 77° 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.
