S
M
T
W
T
F
S
30
87°
75°
31
90°
76°
1
92°
76°
2
93°
77°
3
92°
77°
4
91°
77°
5
94°
77°
6
96°
74°
7
88°
74°
8
85°
74°
9
85°
76°
10
90°
75°
11
93°
75°
12
92°
74°
13
94°
75°
14
95°
77°
15
89°
78°
16
87°
73°
17
87°
72°
18
91°
71°
19
92°
72°
20
86°
74°
21
89°
75°
22
87°
74°
23
80°
69°
24
73°
64°
25
80°
53°
26
83°
53°
27
85°
58°
28
87°
61°
29
86°
66°
30
88°
68°
1
87°
69°
2
85°
68°
3
86°
69°
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 80° to 88°, with overnight lows between 53° and 69°. The average high for September is 85° 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 Richmond Hill. See also: October | November | December.
