S
M
T
W
T
F
S
30
89°
73°
31
90°
72°
1
89°
71°
2
87°
72°
3
87°
72°
4
88°
71°
5
89°
71°
6
88°
72°
7
89°
71°
8
86°
72°
9
86°
72°
10
87°
71°
11
87°
71°
12
88°
74°
13
89°
73°
14
85°
73°
15
Hist. Avg.
88°
73°
16
Hist. Avg.
88°
73°
17
Hist. Avg.
87°
73°
18
Hist. Avg.
87°
73°
19
Hist. Avg.
87°
73°
20
Hist. Avg.
87°
73°
21
Hist. Avg.
87°
73°
22
Hist. Avg.
87°
73°
23
Hist. Avg.
87°
72°
24
Hist. Avg.
86°
72°
25
Hist. Avg.
86°
72°
26
Hist. Avg.
86°
72°
27
Hist. Avg.
86°
72°
28
Hist. Avg.
86°
72°
29
Hist. Avg.
86°
71°
30
Hist. Avg.
85°
71°
1
Hist. Avg.
85°
71°
2
Hist. Avg.
85°
71°
3
Hist. Avg.
85°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. Augustine Beach
St. Augustine Beach's September 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 71° and 74°. The average high for September is 88° 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.
