S
M
T
W
T
F
S
26
50°
34°
27
58°
35°
28
47°
39°
29
39°
33°
30
39°
33°
1
40°
34°
2
47°
31°
3
59°
39°
4
56°
38°
5
39°
35°
6
40°
35°
7
42°
32°
8
56°
30°
9
47°
36°
10
41°
34°
11
44°
35°
12
43°
36°
13
53°
37°
14
61°
35°
15
80°
46°
16
69°
42°
17
48°
36°
18
62°
39°
19
49°
37°
20
42°
33°
21
53°
32°
22
59°
39°
23
58°
42°
24
60°
43°
25
73°
42°
26
69°
47°
27
57°
44°
28
66°
41°
29
70°
44°
30
57°
42°
31
70°
47°
1
72°
49°
2
74°
56°
3
75°
62°
4
70°
55°
5
65°
52°
6
64°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Delaware
Delaware's May 2026 forecast shows daily high temperatures ranging from 57° to 75°, with overnight lows between 42° 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 Delaware. See also: June | July | August.
