S
M
T
W
T
F
S
30
84°
62°
31
83°
61°
1
84°
63°
2
87°
64°
3
84°
66°
4
87°
65°
5
87°
64°
6
82°
61°
7
83°
65°
8
84°
65°
9
82°
63°
10
81°
64°
11
85°
63°
12
85°
64°
13
84°
64°
14
85°
63°
15
85°
64°
16
84°
64°
17
84°
63°
18
83°
60°
19
82°
60°
20
81°
55°
21
78°
59°
22
77°
61°
23
81°
59°
24
82°
57°
25
81°
56°
26
81°
58°
27
80°
59°
28
80°
57°
29
79°
58°
30
78°
57°
1
79°
55°
2
79°
56°
3
73°
56°
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 73° to 87°, with overnight lows between 55° and 66°. The average high for September is 82° with an average low of 61°. 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.
