S
M
T
W
T
F
S
30
77°
54°
31
78°
49°
1
82°
48°
2
75°
48°
3
72°
47°
4
73°
49°
5
73°
50°
6
76°
59°
7
82°
56°
8
83°
47°
9
78°
49°
10
74°
47°
11
74°
58°
12
77°
47°
13
79°
43°
14
71°
46°
15
72°
55°
16
76°
52°
17
80°
43°
18
71°
44°
19
71°
47°
20
76°
50°
21
70°
54°
22
73°
54°
23
79°
53°
24
78°
52°
25
76°
53°
26
78°
53°
27
77°
52°
28
78°
52°
29
76°
51°
30
77°
52°
1
77°
41°
2
76°
37°
3
63°
38°
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 63° to 83°, with overnight lows between 37° and 59°. The average high for September is 76° with an average low of 49°. 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.
