S
M
T
W
T
F
S
30
68°
59°
31
64°
57°
1
67°
55°
2
67°
54°
3
69°
58°
4
N/A
5
66°
47°
6
74°
58°
7
80°
57°
8
62°
49°
9
59°
45°
10
59°
50°
11
61°
50°
12
59°
48°
13
60°
47°
14
61°
49°
15
59°
48°
16
60°
49°
17
60°
46°
18
64°
49°
19
66°
52°
20
63°
51°
21
64°
50°
22
65°
51°
23
65°
51°
24
64°
49°
25
66°
53°
26
65°
51°
27
63°
50°
28
62°
51°
29
61°
51°
30
62°
46°
1
56°
44°
2
55°
43°
3
54°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Spa
Spa's September 2026 forecast shows daily high temperatures ranging from 54° to 80°, with overnight lows between 43° and 58°. The average high for September is 63° 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 Spa. See also: October | November | December.
