S
M
T
W
T
F
S
30
89°
66°
31
88°
67°
1
89°
66°
2
91°
64°
3
88°
62°
4
87°
62°
5
87°
63°
6
88°
63°
7
88°
62°
8
89°
64°
9
91°
64°
10
90°
62°
11
91°
62°
12
91°
65°
13
90°
66°
14
91°
63°
15
90°
64°
16
89°
65°
17
90°
63°
18
88°
63°
19
87°
62°
20
87°
62°
21
88°
63°
22
86°
63°
23
84°
61°
24
84°
62°
25
83°
62°
26
Hist. Avg.
83°
62°
27
Hist. Avg.
83°
62°
28
Hist. Avg.
82°
61°
29
Hist. Avg.
82°
61°
30
Hist. Avg.
82°
60°
1
Hist. Avg.
82°
60°
2
Hist. Avg.
81°
60°
3
Hist. Avg.
81°
59°
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 83° to 91°, with overnight lows between 61° and 67°. The average high for September is 88° with an average low of 63°. 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.
