S
M
T
W
T
F
S
30
90°
76°
31
89°
76°
1
88°
75°
2
90°
76°
3
87°
75°
4
85°
75°
5
85°
74°
6
86°
73°
7
85°
71°
8
85°
73°
9
86°
75°
10
85°
75°
11
85°
74°
12
86°
75°
13
87°
74°
14
87°
71°
15
88°
74°
16
88°
74°
17
89°
73°
18
90°
73°
19
89°
73°
20
88°
71°
21
87°
72°
22
88°
73°
23
87°
72°
24
88°
73°
25
86°
72°
26
86°
72°
27
88°
71°
28
87°
72°
29
87°
72°
30
86°
71°
1
87°
72°
2
88°
68°
3
86°
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 85° to 90°, with overnight lows between 67° and 76°. 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.
