S
M
T
W
T
F
S
30
81°
54°
31
77°
52°
1
74°
54°
2
75°
53°
3
75°
54°
4
76°
53°
5
73°
53°
6
73°
58°
7
74°
56°
8
75°
54°
9
74°
52°
10
73°
52°
11
72°
51°
12
72°
53°
13
72°
52°
14
72°
51°
15
73°
56°
16
77°
52°
17
78°
51°
18
77°
49°
19
70°
54°
20
72°
48°
21
Hist. Avg.
72°
50°
22
Hist. Avg.
72°
50°
23
Hist. Avg.
72°
50°
24
Hist. Avg.
71°
49°
25
Hist. Avg.
71°
49°
26
Hist. Avg.
70°
49°
27
Hist. Avg.
70°
48°
28
Hist. Avg.
69°
48°
29
Hist. Avg.
69°
48°
30
Hist. Avg.
68°
47°
1
Hist. Avg.
68°
47°
2
Hist. Avg.
68°
46°
3
Hist. Avg.
67°
46°
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 70° to 81°, with overnight lows between 48° and 58°. The average high for September is 74° with an average low of 53°. 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.
