S
M
T
W
T
F
S
30
78°
57°
31
79°
56°
1
77°
57°
2
77°
58°
3
76°
58°
4
75°
59°
5
77°
58°
6
76°
57°
7
75°
56°
8
74°
54°
9
73°
55°
10
75°
61°
11
73°
54°
12
74°
54°
13
77°
52°
14
76°
59°
15
76°
59°
16
74°
55°
17
72°
51°
18
72°
51°
19
73°
53°
20
76°
57°
21
74°
54°
22
70°
54°
23
75°
56°
24
73°
54°
25
74°
55°
26
68°
47°
27
72°
49°
28
66°
48°
29
65°
48°
30
67°
49°
1
66°
46°
2
Hist. Avg.
69°
49°
3
Hist. Avg.
69°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rocky Hill
Rocky Hill's September 2026 forecast shows daily high temperatures ranging from 65° to 79°, with overnight lows between 46° and 61°. The average high for September is 73° with an average low of 54°. 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 Rocky Hill. See also: October | November | December.
