S
M
T
W
T
F
S
30
80°
48°
31
86°
45°
1
85°
55°
2
79°
60°
3
72°
54°
4
76°
46°
5
76°
52°
6
72°
50°
7
79°
51°
8
81°
44°
9
87°
45°
10
90°
51°
11
78°
49°
12
79°
49°
13
67°
56°
14
73°
49°
15
71°
47°
16
82°
50°
17
71°
48°
18
82°
52°
19
84°
47°
20
87°
45°
21
88°
55°
22
81°
47°
23
77°
50°
24
75°
53°
25
72°
44°
26
69°
45°
27
71°
43°
28
75°
50°
29
76°
49°
30
74°
49°
1
71°
50°
2
67°
47°
3
69°
47°
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 67° to 88°, with overnight lows between 43° and 55°. The average high for September is 74° with an average low of 48°. 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.
