S
M
T
W
T
F
S
30
91°
75°
31
91°
74°
1
90°
75°
2
90°
75°
3
88°
74°
4
85°
75°
5
86°
75°
6
85°
74°
7
90°
72°
8
89°
74°
9
89°
74°
10
88°
73°
11
89°
74°
12
87°
73°
13
87°
74°
14
88°
73°
15
86°
74°
16
87°
74°
17
85°
73°
18
85°
73°
19
86°
72°
20
85°
73°
21
87°
72°
22
87°
73°
23
88°
73°
24
87°
72°
25
86°
73°
26
85°
72°
27
85°
72°
28
86°
71°
29
87°
71°
30
86°
72°
1
85°
71°
2
84°
70°
3
86°
71°
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 91°, with overnight lows between 70° and 75°. The average high for September is 87° with an average low of 73°. 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.
