S
M
T
W
T
F
S
30
89°
60°
31
88°
61°
1
87°
54°
2
79°
54°
3
79°
55°
4
80°
54°
5
80°
54°
6
81°
55°
7
85°
58°
8
86°
59°
9
86°
60°
10
85°
58°
11
82°
58°
12
79°
57°
13
85°
58°
14
84°
55°
15
83°
56°
16
82°
54°
17
80°
56°
18
77°
55°
19
75°
48°
20
79°
55°
21
80°
54°
22
Hist. Avg.
78°
54°
23
Hist. Avg.
77°
53°
24
Hist. Avg.
77°
53°
25
Hist. Avg.
76°
52°
26
Hist. Avg.
76°
52°
27
Hist. Avg.
75°
52°
28
Hist. Avg.
74°
51°
29
Hist. Avg.
74°
51°
30
Hist. Avg.
74°
50°
1
Hist. Avg.
73°
50°
2
Hist. Avg.
72°
49°
3
Hist. Avg.
72°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Richland
Richland's September 2026 forecast shows daily high temperatures ranging from 75° to 89°, with overnight lows between 48° and 61°. The average high for September is 82° with an average low of 56°. 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.
