S
M
T
W
T
F
S
26
75°
50°
27
75°
51°
28
61°
47°
29
59°
38°
30
56°
35°
1
57°
35°
2
61°
44°
3
70°
47°
4
73°
44°
5
71°
49°
6
63°
38°
7
58°
39°
8
61°
41°
9
65°
44°
10
66°
47°
11
65°
48°
12
68°
52°
13
67°
52°
14
66°
54°
15
66°
51°
16
65°
52°
17
67°
56°
18
72°
57°
19
74°
57°
20
76°
58°
21
77°
59°
22
76°
54°
23
69°
49°
24
66°
52°
25
68°
55°
26
71°
58°
27
71°
55°
28
70°
52°
29
70°
51°
30
77°
60°
31
73°
55°
1
73°
62°
2
82°
59°
3
75°
55°
4
73°
54°
5
73°
54°
6
74°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Ottumwa
Ottumwa's May 2026 forecast shows daily high temperatures ranging from 56° to 82°, with overnight lows between 35° and 62°. The average high for May is 69° 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 Ottumwa. See also: June | July | August.
