S
M
T
W
T
F
S
30
91°
49°
31
85°
56°
1
85°
55°
2
91°
55°
3
84°
53°
4
82°
51°
5
84°
53°
6
86°
54°
7
88°
51°
8
88°
45°
9
79°
50°
10
84°
51°
11
80°
49°
12
82°
47°
13
83°
46°
14
80°
44°
15
75°
46°
16
77°
45°
17
79°
45°
18
78°
42°
19
75°
47°
20
75°
42°
21
76°
44°
22
80°
47°
23
83°
48°
24
83°
47°
25
77°
40°
26
73°
49°
27
76°
39°
28
71°
37°
29
68°
43°
30
69°
49°
1
76°
47°
2
81°
39°
3
83°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mountain Home
Mountain Home's September 2026 forecast shows daily high temperatures ranging from 68° to 91°, with overnight lows between 35° and 56°. The average high for September is 80° with an average low of 47°. 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 Mountain Home. See also: October | November | December.
