S
M
T
W
T
F
S
30
84°
62°
31
88°
65°
1
90°
65°
2
90°
64°
3
89°
62°
4
89°
58°
5
83°
61°
6
87°
64°
7
89°
63°
8
87°
63°
9
82°
62°
10
86°
63°
11
88°
62°
12
88°
63°
13
87°
63°
14
88°
62°
15
87°
62°
16
87°
61°
17
86°
54°
18
80°
54°
19
79°
52°
20
79°
52°
21
77°
51°
22
77°
52°
23
78°
53°
24
83°
54°
25
82°
57°
26
83°
58°
27
84°
56°
28
83°
56°
29
82°
55°
30
82°
54°
1
79°
52°
2
80°
55°
3
75°
49°
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 75° to 90°, with overnight lows between 49° and 65°. The average high for September is 84° with an average low of 58°. 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.
