S
M
T
W
T
F
S
30
77°
47°
31
74°
45°
1
73°
39°
2
70°
38°
3
73°
41°
4
74°
38°
5
73°
36°
6
62°
34°
7
61°
35°
8
61°
42°
9
60°
38°
10
61°
39°
11
62°
32°
12
60°
37°
13
61°
42°
14
61°
37°
15
59°
35°
16
58°
34°
17
60°
34°
18
61°
36°
19
68°
35°
20
67°
35°
21
65°
30°
22
58°
29°
23
57°
32°
24
58°
32°
25
57°
30°
26
56°
30°
27
57°
32°
28
56°
34°
29
56°
34°
30
54°
31°
1
55°
33°
2
59°
37°
3
63°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Northwest Yakima
Northwest Yakima's September 2026 forecast shows daily high temperatures ranging from 54° to 77°, with overnight lows between 29° and 47°. The average high for September is 62° with an average low of 36°. 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 Northwest Yakima. See also: October | November | December.
