S
M
T
W
T
F
S
30
77°
61°
31
76°
62°
1
77°
65°
2
76°
63°
3
76°
63°
4
77°
66°
5
77°
67°
6
81°
68°
7
82°
67°
8
81°
66°
9
79°
65°
10
78°
66°
11
80°
66°
12
79°
65°
13
79°
65°
14
73°
64°
15
73°
63°
16
72°
61°
17
72°
60°
18
75°
63°
19
76°
62°
20
75°
61°
21
81°
61°
22
81°
56°
23
79°
53°
24
72°
56°
25
70°
58°
26
69°
60°
27
76°
59°
28
77°
59°
29
77°
57°
30
76°
56°
1
75°
57°
2
75°
58°
3
76°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rumson
Rumson's September 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 53° and 68°. The average high for September is 76° 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.
