S
M
T
W
T
F
S
30
74°
54°
31
81°
38°
1
75°
57°
2
75°
55°
3
76°
50°
4
78°
46°
5
81°
48°
6
84°
48°
7
67°
49°
8
74°
36°
9
77°
38°
10
80°
41°
11
80°
58°
12
81°
42°
13
76°
50°
14
64°
43°
15
75°
35°
16
81°
52°
17
74°
50°
18
70°
44°
19
65°
43°
20
72°
41°
21
75°
47°
22
74°
44°
23
74°
46°
24
78°
47°
25
77°
47°
26
71°
46°
27
69°
45°
28
69°
43°
29
68°
38°
30
60°
42°
1
61°
37°
2
68°
44°
3
67°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rexburg
Rexburg's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 37° and 52°. The average high for September is 71° with an average low of 44°. 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 Rexburg. See also: October | November | December.
