S
M
T
W
T
F
S
27
68°
40°
28
71°
33°
29
67°
57°
30
70°
47°
1
69°
49°
2
75°
45°
3
76°
51°
4
79°
48°
5
72°
43°
6
79°
46°
7
77°
48°
8
78°
42°
9
72°
48°
10
57°
43°
11
60°
44°
12
61°
33°
13
62°
34°
14
67°
39°
15
70°
34°
16
69°
35°
17
71°
41°
18
64°
37°
19
60°
38°
20
71°
41°
21
72°
40°
22
68°
46°
23
64°
32°
24
54°
39°
25
57°
40°
26
58°
39°
27
58°
40°
28
59°
39°
29
57°
37°
30
54°
39°
31
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Grand Coulee
Grand Coulee's October 2026 forecast shows daily high temperatures ranging from 54° to 72°, with overnight lows between 32° and 46°. The average high for October is 61° with an average low of 39°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Grand Coulee. See also: November | December | January.
