S
M
T
W
T
F
S
30
70°
59°
31
70°
59°
1
68°
57°
2
68°
59°
3
68°
59°
4
64°
59°
5
64°
57°
6
68°
55°
7
77°
55°
8
66°
57°
9
66°
54°
10
61°
54°
11
66°
54°
12
66°
55°
13
66°
55°
14
64°
52°
15
73°
55°
16
66°
54°
17
63°
50°
18
64°
54°
19
63°
57°
20
63°
55°
21
61°
50°
22
66°
46°
23
64°
54°
24
59°
54°
25
64°
46°
26
66°
46°
27
66°
45°
28
70°
57°
29
66°
55°
30
68°
55°
1
64°
57°
2
66°
48°
3
66°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Flensburg
Flensburg's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Flensburg. See also: October | November | December.
