S
M
T
W
T
F
S
30
82°
56°
31
79°
63°
1
78°
54°
2
81°
54°
3
82°
55°
4
88°
55°
5
N/A
6
90°
64°
7
87°
64°
8
87°
61°
9
68°
53°
10
70°
51°
11
72°
51°
12
75°
51°
13
70°
51°
14
73°
52°
15
76°
53°
16
76°
53°
17
71°
49°
18
72°
52°
19
67°
44°
20
68°
45°
21
69°
44°
22
73°
46°
23
74°
48°
24
74°
47°
25
73°
48°
26
73°
48°
27
72°
47°
28
73°
50°
29
72°
49°
30
71°
45°
1
69°
43°
2
70°
47°
3
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Sierre
Sierre's September 2026 forecast shows daily high temperatures ranging from 67° to 90°, with overnight lows between 43° and 64°. The average high for September is 73° 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 Sierre. See also: October | November | December.
