S
M
T
W
T
F
S
26
68°
41°
27
70°
43°
28
75°
52°
29
68°
48°
30
68°
46°
1
77°
52°
2
81°
50°
3
77°
55°
4
72°
52°
5
66°
55°
6
66°
52°
7
57°
46°
8
66°
43°
9
75°
48°
10
79°
54°
11
63°
46°
12
55°
41°
13
59°
46°
14
57°
45°
15
54°
45°
16
57°
43°
17
63°
45°
18
63°
48°
19
67°
54°
20
69°
51°
21
75°
52°
22
81°
58°
23
85°
61°
24
84°
62°
25
85°
66°
26
86°
61°
27
85°
59°
28
84°
59°
29
81°
58°
30
77°
56°
31
78°
57°
1
64°
50°
2
64°
49°
3
65°
49°
4
66°
50°
5
67°
57°
6
71°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Heidelberg
Heidelberg's May 2026 forecast shows daily high temperatures ranging from 64° to 86°, with overnight lows between 49° and 66°. The average high for May is 75° with an average low of 56°. 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 Heidelberg. See also: June | July | August.
