S
M
T
W
T
F
S
26
61°
44°
27
66°
45°
28
64°
49°
29
55°
41°
30
53°
36°
1
48°
37°
2
58°
34°
3
67°
46°
4
77°
49°
5
57°
43°
6
54°
37°
7
58°
35°
8
68°
36°
9
68°
47°
10
62°
38°
11
58°
38°
12
72°
38°
13
60°
36°
14
67°
48°
15
76°
56°
16
81°
52°
17
68°
62°
18
79°
55°
19
69°
45°
20
60°
42°
21
62°
45°
22
63°
49°
23
67°
48°
24
69°
50°
25
73°
54°
26
72°
51°
27
67°
56°
28
75°
55°
29
69°
55°
30
68°
53°
31
68°
50°
1
69°
48°
2
67°
48°
3
68°
50°
4
71°
58°
5
79°
60°
6
79°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oconomowoc
Oconomowoc's May 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 36° and 62°. The average high for May is 70° 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 Oconomowoc. See also: June | July | August.
