S
M
T
W
T
F
S
30
91°
73°
31
92°
73°
1
91°
72°
2
87°
73°
3
87°
72°
4
88°
72°
5
89°
71°
6
88°
72°
7
87°
71°
8
86°
70°
9
86°
67°
10
85°
67°
11
85°
70°
12
86°
70°
13
88°
71°
14
89°
65°
15
88°
65°
16
83°
66°
17
84°
65°
18
85°
66°
19
87°
65°
20
87°
65°
21
86°
69°
22
85°
69°
23
85°
67°
24
84°
63°
25
84°
63°
26
83°
64°
27
83°
63°
28
86°
66°
29
86°
66°
30
85°
65°
1
86°
65°
2
85°
66°
3
86°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Richmond Hill
Richmond Hill's September 2026 forecast shows daily high temperatures ranging from 83° to 92°, with overnight lows between 63° and 73°. The average high for September is 86° with an average low of 68°. 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 Richmond Hill. See also: October | November | December.
