S
M
T
W
T
F
S
30
81°
44°
31
80°
45°
1
80°
43°
2
78°
46°
3
79°
47°
4
78°
45°
5
75°
43°
6
74°
42°
7
77°
42°
8
76°
43°
9
78°
44°
10
77°
43°
11
74°
41°
12
73°
36°
13
74°
42°
14
78°
46°
15
Hist. Avg.
75°
41°
16
Hist. Avg.
74°
41°
17
Hist. Avg.
74°
40°
18
Hist. Avg.
74°
40°
19
Hist. Avg.
73°
40°
20
Hist. Avg.
73°
39°
21
Hist. Avg.
72°
39°
22
Hist. Avg.
72°
39°
23
Hist. Avg.
71°
38°
24
Hist. Avg.
71°
38°
25
Hist. Avg.
70°
38°
26
Hist. Avg.
70°
38°
27
Hist. Avg.
69°
37°
28
Hist. Avg.
69°
37°
29
Hist. Avg.
68°
36°
30
Hist. Avg.
68°
36°
1
Hist. Avg.
67°
36°
2
Hist. Avg.
66°
36°
3
Hist. Avg.
66°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Alta
Alta's September 2026 forecast shows daily high temperatures ranging from 73° to 81°, with overnight lows between 36° and 47°. The average high for September is 77° with an average low of 43°. 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 Alta. See also: October | November | December.
