S
M
T
W
T
F
S
30
84°
64°
31
79°
63°
1
81°
57°
2
82°
54°
3
84°
52°
4
91°
59°
5
77°
59°
6
N/A
7
88°
63°
8
90°
62°
9
67°
50°
10
71°
49°
11
71°
50°
12
73°
52°
13
74°
56°
14
73°
58°
15
76°
59°
16
69°
52°
17
67°
52°
18
66°
51°
19
62°
44°
20
65°
45°
21
66°
48°
22
68°
46°
23
69°
47°
24
69°
49°
25
70°
50°
26
68°
48°
27
66°
44°
28
67°
47°
29
67°
47°
30
66°
46°
1
62°
42°
2
63°
43°
3
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Basel
Basel's September 2026 forecast shows daily high temperatures ranging from 62° to 90°, with overnight lows between 42° and 63°. The average high for September is 70° 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 Basel. See also: October | November | December.
