S
M
T
W
T
F
S
26
64°
38°
27
66°
36°
28
72°
43°
29
65°
45°
30
61°
38°
1
71°
39°
2
80°
42°
3
77°
48°
4
73°
50°
5
71°
52°
6
69°
48°
7
55°
46°
8
66°
41°
9
72°
45°
10
77°
47°
11
63°
44°
12
52°
39°
13
58°
40°
14
55°
43°
15
57°
40°
16
54°
39°
17
61°
38°
18
63°
40°
19
67°
43°
20
66°
50°
21
71°
54°
22
79°
48°
23
86°
53°
24
85°
55°
25
84°
56°
26
89°
56°
27
N/A
28
77°
43°
29
82°
52°
30
81°
58°
31
75°
55°
1
73°
53°
2
73°
54°
3
70°
49°
4
73°
55°
5
70°
51°
6
76°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Heilbronn
Heilbronn's May 2026 forecast shows daily high temperatures ranging from 70° to 82°, with overnight lows between 43° and 58°. The average high for May is 75° 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 Heilbronn. See also: June | July | August.
