S
M
T
W
T
F
S
30
78°
66°
31
78°
71°
1
80°
68°
2
73°
66°
3
86°
69°
4
86°
76°
5
81°
69°
6
74°
63°
7
80°
60°
8
82°
65°
9
80°
66°
10
88°
72°
11
79°
67°
12
77°
62°
13
80°
71°
14
77°
62°
15
70°
56°
16
76°
60°
17
80°
69°
18
83°
71°
19
72°
63°
20
72°
62°
21
72°
59°
22
67°
56°
23
67°
58°
24
67°
58°
25
67°
59°
26
70°
60°
27
71°
60°
28
69°
59°
29
70°
59°
30
69°
60°
1
71°
59°
2
72°
58°
3
68°
62°
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 67° to 72°, with overnight lows between 56° and 63°. The average high for September is 70° with an average low of 59°. 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.
