S
M
T
W
T
F
S
30
90°
76°
31
90°
75°
1
89°
76°
2
90°
76°
3
88°
75°
4
89°
76°
5
88°
75°
6
89°
76°
7
90°
76°
8
89°
75°
9
86°
75°
10
89°
76°
11
89°
76°
12
90°
75°
13
89°
75°
14
88°
74°
15
84°
75°
16
83°
75°
17
85°
74°
18
84°
75°
19
83°
74°
20
85°
75°
21
85°
69°
22
84°
70°
23
86°
69°
24
87°
70°
25
85°
71°
26
86°
69°
27
85°
72°
28
87°
73°
29
87°
72°
30
85°
72°
1
85°
71°
2
83°
72°
3
82°
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 82° to 90°, 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.
