S
M
T
W
T
F
S
30
86°
75°
31
89°
76°
1
86°
76°
2
86°
75°
3
87°
75°
4
86°
74°
5
85°
74°
6
85°
73°
7
86°
75°
8
86°
75°
9
85°
74°
10
85°
75°
11
86°
75°
12
85°
74°
13
86°
75°
14
86°
75°
15
85°
74°
16
85°
74°
17
84°
71°
18
84°
73°
19
85°
72°
20
84°
72°
21
84°
74°
22
85°
73°
23
82°
72°
24
83°
73°
25
84°
74°
26
85°
74°
27
84°
72°
28
86°
70°
29
86°
70°
30
87°
72°
1
88°
71°
2
87°
66°
3
84°
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 82° to 89°, with overnight lows between 66° and 76°. The average high for September is 85° 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.
