S
M
T
W
T
F
S
26
62°
46°
27
76°
44°
28
72°
55°
29
60°
46°
30
57°
41°
1
49°
33°
2
52°
33°
3
60°
47°
4
73°
58°
5
66°
49°
6
57°
42°
7
53°
36°
8
56°
42°
9
62°
45°
10
65°
46°
11
66°
49°
12
67°
50°
13
66°
50°
14
64°
49°
15
70°
53°
16
66°
49°
17
70°
54°
18
75°
56°
19
76°
56°
20
75°
57°
21
78°
57°
22
77°
58°
23
78°
56°
24
73°
51°
25
70°
52°
26
76°
58°
27
78°
58°
28
73°
57°
29
74°
56°
30
72°
54°
31
77°
55°
1
72°
52°
2
74°
59°
3
76°
52°
4
71°
51°
5
72°
52°
6
72°
52°
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 49° to 78°, with overnight lows between 33° and 59°. 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.
