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