S
M
T
W
T
F
S
30
87°
74°
31
89°
73°
1
88°
75°
2
89°
74°
3
88°
74°
4
88°
73°
5
90°
72°
6
90°
74°
7
89°
75°
8
90°
74°
9
89°
74°
10
89°
74°
11
87°
73°
12
86°
73°
13
87°
72°
14
88°
73°
15
88°
74°
16
89°
74°
17
90°
73°
18
89°
74°
19
88°
73°
20
89°
74°
21
88°
73°
22
87°
74°
23
89°
72°
24
88°
72°
25
84°
73°
26
84°
71°
27
86°
72°
28
85°
70°
29
84°
72°
30
84°
72°
1
85°
69°
2
84°
67°
3
83°
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 83° to 90°, with overnight lows between 67° 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. See also: October | November | December.
