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