S
M
T
W
T
F
S
26
67°
55°
27
67°
55°
28
69°
59°
29
65°
54°
30
65°
52°
31
65°
51°
1
97°
56°
2
94°
57°
3
102°
61°
4
105°
65°
5
105°
66°
6
96°
54°
7
96°
56°
8
95°
54°
9
94°
53°
10
93°
54°
11
92°
54°
12
93°
52°
13
93°
53°
14
94°
52°
15
92°
54°
16
88°
51°
17
89°
53°
18
91°
55°
19
89°
53°
20
87°
51°
21
86°
50°
22
86°
50°
23
87°
49°
24
86°
50°
25
92°
54°
26
93°
55°
27
93°
54°
28
92°
53°
29
88°
54°
30
85°
51°
31
84°
47°
1
83°
46°
2
84°
47°
3
85°
50°
4
85°
49°
5
84°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Cottage Grove
Cottage Grove's August 2026 forecast shows daily high temperatures ranging from 83° to 105°, with overnight lows between 46° and 66°. The average high for August is 91° with an average low of 53°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Cottage Grove. See also: September | October | November.
