S
M
T
W
T
F
S
30
87°
55°
31
79°
58°
1
79°
58°
2
83°
63°
3
87°
64°
4
88°
62°
5
88°
56°
6
83°
53°
7
79°
52°
8
79°
55°
9
80°
60°
10
80°
56°
11
76°
51°
12
74°
50°
13
75°
56°
14
76°
54°
15
77°
48°
16
78°
47°
17
72°
47°
18
72°
48°
19
73°
47°
20
71°
47°
21
71°
46°
22
72°
46°
23
73°
47°
24
75°
52°
25
77°
54°
26
78°
49°
27
79°
49°
28
70°
54°
29
74°
46°
30
77°
47°
1
71°
50°
2
69°
43°
3
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Richland
Richland's September 2026 forecast shows daily high temperatures ranging from 66° to 88°, with overnight lows between 43° and 64°. The average high for September is 77° with an average low of 52°. 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 Richland. See also: October | November | December.
