S
M
T
W
T
F
S
30
86°
75°
31
87°
74°
1
86°
74°
2
86°
73°
3
87°
74°
4
86°
75°
5
86°
76°
6
87°
76°
7
87°
75°
8
88°
74°
9
87°
75°
10
88°
76°
11
89°
76°
12
88°
75°
13
86°
75°
14
87°
74°
15
86°
75°
16
89°
75°
17
89°
74°
18
88°
75°
19
88°
75°
20
84°
74°
21
84°
73°
22
85°
72°
23
88°
74°
24
87°
73°
25
85°
73°
26
85°
71°
27
87°
70°
28
86°
69°
29
86°
72°
30
87°
71°
1
88°
72°
2
87°
72°
3
84°
71°
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 89°, with overnight lows between 69° and 76°. The average high for September is 87° with an average low of 74°. 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.
