S
M
T
W
T
F
S
26
66°
37°
27
68°
39°
28
70°
43°
29
66°
48°
30
63°
41°
1
73°
41°
2
77°
41°
3
75°
48°
4
72°
50°
5
68°
52°
6
64°
46°
7
57°
45°
8
68°
41°
9
73°
45°
10
75°
48°
11
61°
43°
12
52°
39°
13
57°
37°
14
55°
41°
15
54°
43°
16
55°
37°
17
61°
39°
18
63°
41°
19
64°
43°
20
64°
54°
21
72°
54°
22
79°
48°
23
84°
52°
24
84°
55°
25
86°
59°
26
88°
57°
27
86°
61°
28
79°
59°
29
85°
61°
30
84°
58°
31
79°
56°
1
76°
54°
2
74°
55°
3
69°
53°
4
71°
52°
5
71°
55°
6
76°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Heilbronn
Heilbronn's May 2026 forecast shows daily high temperatures ranging from 69° to 85°, with overnight lows between 52° and 61°. The average high for May is 76° 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 Heilbronn. See also: June | July | August.
