S
M
T
W
T
F
S
30
65°
51°
31
63°
48°
1
63°
47°
2
64°
44°
3
62°
44°
4
62°
46°
5
63°
49°
6
62°
48°
7
61°
47°
8
61°
44°
9
63°
44°
10
62°
49°
11
64°
51°
12
67°
50°
13
68°
48°
14
60°
47°
15
61°
49°
16
58°
42°
17
58°
43°
18
Hist. Avg.
64°
54°
19
Hist. Avg.
64°
53°
20
Hist. Avg.
64°
53°
21
Hist. Avg.
63°
53°
22
Hist. Avg.
63°
52°
23
Hist. Avg.
62°
52°
24
Hist. Avg.
62°
52°
25
Hist. Avg.
62°
51°
26
Hist. Avg.
61°
51°
27
Hist. Avg.
61°
51°
28
Hist. Avg.
61°
50°
29
Hist. Avg.
60°
50°
30
Hist. Avg.
60°
50°
1
Hist. Avg.
59°
49°
2
Hist. Avg.
59°
49°
3
Hist. Avg.
59°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Heidelberg
Heidelberg's September 2026 forecast shows daily high temperatures ranging from 58° to 68°, with overnight lows between 42° and 51°. The average high for September is 62° 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 September weather will actually feel in Heidelberg. See also: October | November | December.
