S
M
T
W
T
F
S
26
86°
72°
27
87°
74°
28
86°
73°
29
86°
71°
30
81°
68°
1
69°
55°
2
74°
53°
3
77°
48°
4
78°
52°
5
82°
60°
6
86°
73°
7
77°
61°
8
73°
66°
9
76°
65°
10
86°
65°
11
81°
68°
12
83°
65°
13
85°
64°
14
88°
64°
15
86°
66°
16
84°
67°
17
88°
72°
18
89°
73°
19
88°
74°
20
84°
72°
21
84°
72°
22
81°
74°
23
82°
73°
24
82°
73°
25
82°
74°
26
83°
72°
27
84°
71°
28
85°
73°
29
85°
73°
30
86°
70°
31
86°
72°
1
89°
70°
2
90°
73°
3
86°
72°
4
86°
73°
5
87°
73°
6
86°
74°
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 81° to 90°, with overnight lows between 70° and 74°. The average high for May is 85° with an average low of 73°. 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.
