S
M
T
W
T
F
S
30
86°
73°
31
86°
74°
1
87°
73°
2
87°
74°
3
88°
74°
4
87°
73°
5
87°
73°
6
88°
74°
7
88°
72°
8
89°
73°
9
90°
72°
10
86°
71°
11
86°
71°
12
87°
73°
13
86°
72°
14
87°
73°
15
88°
72°
16
88°
73°
17
89°
73°
18
88°
70°
19
89°
71°
20
85°
73°
21
88°
71°
22
88°
73°
23
89°
74°
24
88°
73°
25
87°
74°
26
88°
73°
27
88°
73°
28
87°
72°
29
88°
73°
30
87°
71°
1
86°
72°
2
87°
68°
3
84°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Augustine
St. Augustine's September 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 67° and 74°. 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. See also: October | November | December.
