S
M
T
W
T
F
S
30
90°
65°
31
89°
64°
1
88°
60°
2
87°
55°
3
79°
57°
4
81°
63°
5
85°
64°
6
86°
61°
7
87°
62°
8
85°
61°
9
81°
61°
10
80°
55°
11
77°
54°
12
77°
54°
13
78°
59°
14
82°
60°
15
82°
60°
16
78°
59°
17
78°
58°
18
77°
49°
19
75°
49°
20
73°
51°
21
74°
54°
22
76°
57°
23
79°
57°
24
80°
58°
25
81°
49°
26
80°
48°
27
71°
49°
28
70°
48°
29
69°
48°
30
70°
46°
1
Hist. Avg.
76°
55°
2
Hist. Avg.
76°
54°
3
Hist. Avg.
75°
54°
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 69° to 90°, with overnight lows between 46° and 65°. The average high for September is 80° 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.
