S
M
T
W
T
F
S
30
89°
71°
31
89°
72°
1
90°
72°
2
88°
73°
3
89°
74°
4
87°
73°
5
87°
72°
6
88°
72°
7
90°
74°
8
90°
73°
9
89°
72°
10
90°
73°
11
90°
73°
12
89°
72°
13
89°
73°
14
88°
74°
15
89°
73°
16
87°
73°
17
89°
74°
18
87°
73°
19
86°
73°
20
88°
74°
21
89°
73°
22
85°
74°
23
87°
74°
24
86°
72°
25
87°
72°
26
87°
72°
27
85°
72°
28
86°
72°
29
87°
72°
30
Hist. Avg.
85°
71°
1
Hist. Avg.
85°
71°
2
Hist. Avg.
85°
71°
3
Hist. Avg.
85°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. Augustine
St. Augustine's September 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 71° and 74°. The average high for September is 88° 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.
