S
M
T
W
T
F
S
26
58°
43°
27
71°
38°
28
60°
49°
29
61°
53°
30
67°
42°
1
68°
37°
2
60°
41°
3
63°
38°
4
78°
43°
5
85°
59°
6
72°
55°
7
68°
47°
8
72°
40°
9
66°
48°
10
79°
53°
11
64°
42°
12
64°
50°
13
62°
52°
14
64°
47°
15
68°
47°
16
74°
52°
17
81°
56°
18
83°
59°
19
81°
57°
20
81°
56°
21
80°
57°
22
83°
53°
23
81°
58°
24
80°
57°
25
81°
58°
26
81°
59°
27
82°
59°
28
82°
60°
29
81°
60°
30
83°
59°
31
82°
60°
1
82°
58°
2
75°
54°
3
75°
56°
4
78°
60°
5
77°
61°
6
83°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Dayton
Dayton's May 2026 forecast shows daily high temperatures ranging from 62° to 83°, with overnight lows between 42° and 61°. The average high for May is 77° with an average low of 55°. 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 Dayton. See also: June | July | August.
