S
M
T
W
T
F
S
26
63°
38°
27
69°
41°
28
67°
49°
29
51°
41°
30
53°
33°
1
51°
33°
2
49°
33°
3
62°
33°
4
70°
44°
5
60°
47°
6
53°
40°
7
56°
34°
8
61°
38°
9
61°
44°
10
57°
35°
11
55°
34°
12
59°
30°
13
58°
42°
14
57°
40°
15
65°
48°
16
68°
57°
17
73°
58°
18
83°
65°
19
76°
55°
20
68°
45°
21
62°
46°
22
60°
44°
23
63°
49°
24
68°
55°
25
69°
58°
26
71°
54°
27
72°
60°
28
65°
53°
29
69°
54°
30
72°
51°
31
63°
46°
1
63°
45°
2
62°
45°
3
64°
46°
4
66°
52°
5
71°
56°
6
75°
58°
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 83°, with overnight lows between 40° and 65°. The average high for May is 68° with an average low of 52°. 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.
