S
M
T
W
T
F
S
30
88°
75°
31
87°
75°
1
87°
76°
2
88°
74°
3
90°
73°
4
90°
74°
5
89°
75°
6
90°
74°
7
88°
75°
8
87°
74°
9
88°
72°
10
86°
75°
11
84°
75°
12
85°
73°
13
85°
74°
14
86°
73°
15
86°
73°
16
86°
71°
17
86°
75°
18
87°
75°
19
88°
74°
20
88°
75°
21
87°
75°
22
88°
74°
23
87°
75°
24
85°
74°
25
83°
74°
26
84°
73°
27
83°
74°
28
83°
74°
29
84°
73°
30
84°
73°
1
83°
71°
2
86°
72°
3
87°
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 83° to 90°, with overnight lows between 71° and 76°. The average high for September is 86° 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.
