S
M
T
W
T
F
S
26
78°
56°
27
65°
54°
28
76°
51°
29
69°
57°
30
75°
54°
1
79°
59°
2
76°
62°
3
71°
59°
4
62°
54°
5
60°
54°
6
64°
50°
7
54°
42°
8
59°
52°
9
60°
52°
10
58°
51°
11
61°
46°
12
68°
48°
13
65°
48°
14
69°
47°
15
N/A
16
70°
56°
17
62°
54°
18
65°
47°
19
61°
48°
20
61°
47°
21
63°
46°
22
63°
48°
23
63°
47°
24
61°
45°
25
60°
46°
26
60°
45°
27
59°
46°
28
60°
45°
29
58°
45°
30
58°
44°
31
59°
45°
1
61°
45°
2
60°
46°
3
59°
46°
4
58°
47°
5
57°
45°
6
57°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Heidelberg
Heidelberg's May 2026 forecast shows daily high temperatures ranging from 57° to 70°, with overnight lows between 44° and 56°. The average high for May is 61° with an average low of 47°. 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.
