S
M
T
W
T
F
S
30
73°
49°
31
84°
45°
1
86°
62°
2
76°
58°
3
76°
47°
4
66°
45°
5
78°
44°
6
77°
52°
7
68°
46°
8
73°
41°
9
80°
47°
10
83°
58°
11
79°
57°
12
85°
53°
13
72°
49°
14
66°
43°
15
76°
35°
16
84°
43°
17
87°
57°
18
67°
49°
19
67°
48°
20
75°
43°
21
79°
45°
22
74°
51°
23
79°
42°
24
86°
47°
25
83°
51°
26
64°
44°
27
77°
44°
28
71°
52°
29
72°
50°
30
77°
50°
1
76°
53°
2
84°
44°
3
79°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Twin Falls
Twin Falls's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Twin Falls. See also: October | November | December.
