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