S
M
T
W
T
F
S
30
87°
68°
31
93°
69°
1
90°
64°
2
89°
65°
3
88°
72°
4
87°
69°
5
86°
67°
6
81°
69°
7
84°
68°
8
83°
66°
9
81°
62°
10
82°
56°
11
87°
62°
12
76°
57°
13
72°
52°
14
62°
49°
15
72°
54°
16
75°
49°
17
73°
58°
18
62°
60°
19
62°
57°
20
66°
55°
21
61°
50°
22
67°
49°
23
69°
47°
24
68°
54°
25
71°
59°
26
64°
58°
27
67°
57°
28
73°
55°
29
69°
59°
30
72°
62°
1
67°
53°
2
63°
41°
3
72°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cottage Grove
Cottage Grove's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Cottage Grove. See also: October | November | December.
