S
M
T
W
T
F
S
30
86°
74°
31
86°
75°
1
87°
75°
2
88°
74°
3
86°
75°
4
86°
75°
5
84°
74°
6
85°
75°
7
84°
75°
8
85°
74°
9
85°
75°
10
84°
75°
11
90°
72°
12
89°
69°
13
86°
72°
14
87°
73°
15
88°
72°
16
87°
73°
17
88°
73°
18
88°
72°
19
87°
71°
20
88°
71°
21
88°
69°
22
84°
71°
23
84°
71°
24
85°
73°
25
84°
73°
26
86°
71°
27
84°
69°
28
86°
68°
29
85°
69°
30
87°
71°
1
86°
71°
2
85°
70°
3
83°
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 83° to 90°, with overnight lows between 68° and 75°. The average high for September is 86° 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.
