S
M
T
W
T
F
S
26
54°
44°
27
58°
44°
28
64°
40°
29
58°
40°
30
63°
45°
1
61°
41°
2
59°
42°
3
66°
47°
4
67°
48°
5
68°
47°
6
68°
49°
7
69°
51°
8
69°
50°
9
68°
47°
10
61°
45°
11
59°
44°
12
61°
50°
13
68°
49°
14
62°
47°
15
67°
51°
16
71°
52°
17
71°
52°
18
70°
40°
19
67°
42°
20
64°
43°
21
65°
42°
22
64°
44°
23
65°
45°
24
62°
45°
25
66°
55°
26
74°
46°
27
72°
52°
28
67°
58°
29
73°
51°
30
81°
48°
31
68°
57°
1
74°
49°
2
76°
58°
3
79°
59°
4
80°
50°
5
77°
48°
6
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oshkosh
Oshkosh's May 2026 forecast shows daily high temperatures ranging from 54° to 81°, with overnight lows between 40° and 59°. The average high for May is 67° with an average low of 48°. 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 Oshkosh. See also: June | July | August.
