S
M
T
W
T
F
S
26
75°
50°
27
75°
51°
28
61°
47°
29
59°
40°
30
59°
38°
1
60°
34°
2
61°
38°
3
75°
46°
4
84°
47°
5
58°
45°
6
57°
36°
7
69°
37°
8
73°
43°
9
76°
44°
10
69°
36°
11
74°
41°
12
82°
49°
13
74°
46°
14
78°
58°
15
86°
59°
16
87°
62°
17
82°
68°
18
80°
60°
19
74°
49°
20
76°
53°
21
72°
52°
22
79°
56°
23
75°
57°
24
77°
55°
25
80°
61°
26
80°
61°
27
81°
61°
28
80°
60°
29
79°
60°
30
75°
58°
31
75°
57°
1
72°
60°
2
73°
62°
3
79°
62°
4
78°
61°
5
81°
63°
6
81°
61°
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 72° to 87°, with overnight lows between 46° and 68°. The average high for May is 78° with an average low of 58°. 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.
