S
M
T
W
T
F
S
30
77°
65°
31
78°
66°
1
82°
61°
2
77°
61°
3
77°
62°
4
78°
60°
5
76°
60°
6
78°
63°
7
79°
62°
8
79°
65°
9
81°
64°
10
76°
64°
11
79°
63°
12
80°
64°
13
80°
63°
14
81°
64°
15
81°
63°
16
80°
60°
17
78°
61°
18
72°
62°
19
78°
61°
20
79°
61°
21
78°
60°
22
77°
54°
23
75°
53°
24
Hist. Avg.
73°
55°
25
Hist. Avg.
72°
55°
26
Hist. Avg.
72°
54°
27
Hist. Avg.
72°
54°
28
Hist. Avg.
71°
54°
29
Hist. Avg.
71°
53°
30
Hist. Avg.
71°
53°
1
Hist. Avg.
70°
53°
2
Hist. Avg.
70°
52°
3
Hist. Avg.
69°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rumson
Rumson's September 2026 forecast shows daily high temperatures ranging from 72° to 82°, with overnight lows between 53° and 66°. The average high for September is 78° with an average low of 62°. 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 Rumson. See also: October | November | December.
