S
M
T
W
T
F
S
30
79°
50°
31
89°
43°
1
86°
59°
2
77°
55°
3
76°
50°
4
75°
45°
5
81°
51°
6
78°
55°
7
80°
55°
8
81°
54°
9
82°
51°
10
84°
53°
11
86°
53°
12
85°
52°
13
84°
51°
14
83°
49°
15
88°
56°
16
88°
54°
17
74°
47°
18
74°
47°
19
82°
52°
20
84°
53°
21
75°
50°
22
82°
52°
23
85°
52°
24
82°
46°
25
69°
40°
26
71°
50°
27
77°
47°
28
69°
40°
29
70°
42°
30
74°
48°
1
80°
48°
2
68°
44°
3
66°
47°
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 66° to 88°, with overnight lows between 40° and 59°. The average high for September is 79° 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 Mountain Home. See also: October | November | December.
