S
M
T
W
T
F
S
30
86°
68°
31
91°
70°
1
88°
68°
2
90°
64°
3
86°
72°
4
91°
73°
5
81°
66°
6
79°
66°
7
81°
64°
8
81°
64°
9
84°
59°
10
77°
54°
11
82°
55°
12
75°
55°
13
70°
48°
14
63°
46°
15
70°
52°
16
73°
60°
17
74°
55°
18
65°
61°
19
68°
55°
20
63°
52°
21
62°
49°
22
64°
48°
23
68°
50°
24
69°
48°
25
70°
50°
26
73°
52°
27
72°
50°
28
73°
47°
29
69°
42°
30
71°
47°
1
71°
47°
2
62°
44°
3
63°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Peterson
Peterson's September 2026 forecast shows daily high temperatures ranging from 62° to 74°, with overnight lows between 42° and 61°. The average high for September is 68° 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 Peterson. See also: October | November | December.
