S
M
T
W
T
F
S
30
68°
50°
31
68°
50°
1
67°
51°
2
67°
54°
3
68°
49°
4
67°
49°
5
66°
53°
6
66°
47°
7
67°
48°
8
66°
48°
9
66°
54°
10
71°
50°
11
69°
48°
12
64°
50°
13
65°
49°
14
70°
53°
15
70°
49°
16
65°
46°
17
63°
51°
18
68°
54°
19
69°
53°
20
68°
53°
21
69°
52°
22
69°
52°
23
67°
51°
24
68°
49°
25
64°
49°
26
60°
51°
27
60°
50°
28
64°
51°
29
65°
48°
30
59°
43°
1
59°
43°
2
Hist. Avg.
61°
46°
3
Hist. Avg.
60°
46°
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 59° to 71°, with overnight lows between 43° and 54°. The average high for September is 66° with an average low of 50°. 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.
