S
M
T
W
T
F
S
26
45°
32°
27
52°
31°
28
55°
30°
29
58°
28°
30
62°
30°
1
66°
32°
2
70°
32°
3
74°
31°
4
75°
34°
5
62°
47°
6
64°
34°
7
72°
38°
8
76°
37°
9
73°
39°
10
76°
35°
11
85°
35°
12
86°
44°
13
87°
44°
14
70°
34°
15
75°
34°
16
66°
34°
17
49°
34°
18
54°
35°
19
63°
27°
20
68°
33°
21
65°
41°
22
70°
32°
23
77°
46°
24
78°
49°
25
82°
51°
26
75°
46°
27
72°
46°
28
77°
48°
29
68°
47°
30
75°
47°
31
79°
48°
1
84°
49°
2
86°
50°
3
86°
53°
4
85°
53°
5
75°
43°
6
77°
46°
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 68° to 86°, with overnight lows between 43° and 53°. The average high for May is 78° 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 Dayton. See also: June | July | August.
