S
M
T
W
T
F
S
30
84°
61°
31
86°
66°
1
84°
63°
2
82°
64°
3
86°
59°
4
88°
59°
5
85°
68°
6
87°
68°
7
85°
66°
8
84°
64°
9
72°
60°
10
77°
58°
11
73°
57°
12
75°
59°
13
72°
55°
14
71°
58°
15
74°
59°
16
71°
58°
17
73°
59°
18
70°
56°
19
63°
50°
20
64°
51°
21
66°
50°
22
68°
50°
23
68°
53°
24
67°
50°
25
68°
50°
26
68°
54°
27
67°
52°
28
67°
55°
29
66°
52°
30
66°
50°
1
64°
48°
2
63°
51°
3
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ascona
Ascona's September 2026 forecast shows daily high temperatures ranging from 63° to 87°, with overnight lows between 48° and 68°. The average high for September is 71° with an average low of 55°. 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 Ascona. See also: October | November | December.
