S
M
T
W
T
F
S
30
91°
72°
31
89°
73°
1
89°
72°
2
90°
72°
3
89°
73°
4
89°
73°
5
90°
72°
6
89°
72°
7
89°
71°
8
88°
71°
9
88°
72°
10
89°
71°
11
88°
70°
12
88°
71°
13
89°
70°
14
88°
70°
15
87°
71°
16
88°
71°
17
89°
70°
18
88°
71°
19
87°
71°
20
Hist. Avg.
89°
70°
21
Hist. Avg.
89°
70°
22
Hist. Avg.
89°
70°
23
Hist. Avg.
89°
70°
24
Hist. Avg.
89°
69°
25
Hist. Avg.
89°
69°
26
Hist. Avg.
89°
69°
27
Hist. Avg.
88°
69°
28
Hist. Avg.
88°
69°
29
Hist. Avg.
88°
68°
30
Hist. Avg.
88°
68°
1
Hist. Avg.
88°
68°
2
Hist. Avg.
88°
68°
3
Hist. Avg.
87°
68°
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 87° to 91°, with overnight lows between 70° and 73°. The average high for September is 89° with an average low of 71°. 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.
