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