S
M
T
W
T
F
S
30
86°
72°
31
86°
73°
1
87°
72°
2
87°
73°
3
88°
73°
4
87°
72°
5
87°
72°
6
88°
73°
7
87°
71°
8
89°
72°
9
90°
71°
10
86°
71°
11
86°
72°
12
85°
73°
13
86°
72°
14
87°
73°
15
86°
72°
16
88°
72°
17
89°
71°
18
89°
70°
19
88°
70°
20
85°
73°
21
88°
71°
22
88°
73°
23
89°
73°
24
88°
72°
25
87°
73°
26
87°
73°
27
86°
72°
28
88°
73°
29
88°
73°
30
86°
71°
1
87°
72°
2
86°
67°
3
84°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Augustine Beach
St. Augustine Beach's September 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 67° and 73°. The average high for September is 87° with an average low of 72°. 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 St. Augustine Beach. See also: October | November | December.
