S
M
T
W
T
F
S
30
82°
71°
31
78°
68°
1
74°
65°
2
78°
67°
3
78°
68°
4
76°
68°
5
80°
71°
6
73°
70°
7
79°
70°
8
75°
69°
9
74°
68°
10
73°
67°
11
72°
67°
12
71°
65°
13
72°
67°
14
72°
67°
15
74°
64°
16
77°
68°
17
78°
67°
18
70°
62°
19
71°
63°
20
74°
65°
21
76°
67°
22
75°
67°
23
74°
66°
24
73°
64°
25
74°
66°
26
77°
67°
27
77°
68°
28
76°
67°
29
77°
67°
30
76°
66°
1
77°
67°
2
76°
66°
3
74°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Newport Beach
Newport Beach's September 2026 forecast shows daily high temperatures ranging from 70° to 80°, with overnight lows between 62° and 71°. The average high for September is 75° with an average low of 67°. 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 Newport Beach. See also: October | November | December.
