S
M
T
W
T
F
S
30
68°
55°
31
67°
55°
1
72°
49°
2
67°
48°
3
67°
54°
4
68°
47°
5
66°
49°
6
67°
48°
7
66°
49°
8
70°
54°
9
73°
53°
10
70°
50°
11
66°
47°
12
68°
49°
13
65°
50°
14
67°
50°
15
70°
53°
16
71°
46°
17
66°
53°
18
69°
54°
19
69°
52°
20
68°
48°
21
63°
45°
22
62°
44°
23
61°
45°
24
62°
51°
25
66°
53°
26
64°
52°
27
68°
50°
28
67°
51°
29
66°
48°
30
59°
43°
1
59°
41°
2
58°
40°
3
58°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Luxembourg
Luxembourg's September 2026 forecast shows daily high temperatures ranging from 58° to 73°, with overnight lows between 40° and 55°. The average high for September is 66° with an average low of 49°. 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 Luxembourg. See also: October | November | December.
