S
M
T
W
T
F
S
30
75°
42°
31
83°
46°
1
88°
56°
2
75°
48°
3
70°
45°
4
72°
46°
5
75°
48°
6
76°
54°
7
77°
52°
8
79°
54°
9
80°
55°
10
82°
50°
11
84°
54°
12
82°
55°
13
80°
52°
14
82°
49°
15
84°
54°
16
78°
52°
17
72°
49°
18
72°
45°
19
76°
52°
20
72°
51°
21
71°
46°
22
71°
43°
23
72°
49°
24
69°
47°
25
69°
45°
26
70°
47°
27
75°
50°
28
70°
50°
29
68°
47°
30
71°
48°
1
73°
48°
2
67°
47°
3
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Toppenish
Toppenish's September 2026 forecast shows daily high temperatures ranging from 66° to 88°, with overnight lows between 43° and 56°. The average high for September is 75° with an average low of 50°. 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 Toppenish. See also: October | November | December.
