S
M
T
W
T
F
S
30
75°
42°
31
83°
46°
1
85°
54°
2
70°
43°
3
70°
45°
4
70°
45°
5
73°
47°
6
77°
50°
7
79°
51°
8
80°
50°
9
81°
52°
10
83°
51°
11
80°
50°
12
79°
48°
13
79°
47°
14
81°
48°
15
78°
49°
16
74°
46°
17
72°
46°
18
72°
42°
19
73°
41°
20
76°
49°
21
73°
45°
22
73°
45°
23
71°
40°
24
70°
39°
25
70°
37°
26
72°
40°
27
79°
45°
28
79°
46°
29
78°
46°
30
79°
45°
1
78°
46°
2
78°
45°
3
77°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Yakima
Yakima's September 2026 forecast shows daily high temperatures ranging from 70° to 83°, with overnight lows between 37° and 52°. The average high for September is 76° with an average low of 46°. 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 Yakima. See also: October | November | December.
