S
M
T
W
T
F
S
26
81°
55°
27
87°
47°
28
83°
53°
29
84°
50°
30
83°
52°
31
91°
45°
1
79°
48°
2
79°
48°
3
89°
53°
4
99°
57°
5
98°
56°
6
92°
52°
7
91°
53°
8
92°
56°
9
91°
54°
10
87°
53°
11
85°
52°
12
87°
53°
13
86°
54°
14
83°
51°
15
81°
52°
16
77°
47°
17
78°
54°
18
80°
51°
19
81°
50°
20
78°
48°
21
77°
51°
22
77°
47°
23
78°
53°
24
76°
46°
25
83°
52°
26
84°
53°
27
84°
53°
28
82°
52°
29
76°
52°
30
75°
45°
31
75°
49°
1
74°
47°
2
74°
45°
3
75°
47°
4
75°
47°
5
73°
48°
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 73° to 99°, with overnight lows between 45° and 57°. The average high for August is 82° with an average low of 51°. 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.
