S
M
T
W
T
F
S
30
93°
62°
31
90°
54°
1
85°
51°
2
79°
55°
3
87°
63°
4
90°
59°
5
89°
50°
6
78°
48°
7
74°
49°
8
74°
56°
9
73°
50°
10
74°
56°
11
78°
45°
12
74°
52°
13
76°
57°
14
83°
52°
15
75°
49°
16
72°
46°
17
71°
45°
18
73°
47°
19
79°
48°
20
80°
51°
21
81°
47°
22
74°
42°
23
68°
45°
24
70°
51°
25
76°
46°
26
68°
43°
27
68°
45°
28
69°
45°
29
69°
47°
30
66°
44°
1
65°
43°
2
68°
46°
3
72°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in West Richland
West Richland's September 2026 forecast shows daily high temperatures ranging from 65° to 93°, with overnight lows between 42° and 63°. The average high for September is 76° 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 West Richland. See also: October | November | December.
