S
M
T
W
T
F
S
30
87°
73°
31
87°
74°
1
88°
72°
2
88°
72°
3
87°
73°
4
88°
72°
5
88°
74°
6
89°
74°
7
87°
73°
8
87°
75°
9
90°
73°
10
89°
72°
11
90°
73°
12
89°
74°
13
88°
72°
14
89°
71°
15
88°
72°
16
87°
73°
17
87°
73°
18
Hist. Avg.
87°
73°
19
Hist. Avg.
87°
73°
20
Hist. Avg.
87°
73°
21
Hist. Avg.
87°
73°
22
Hist. Avg.
87°
73°
23
Hist. Avg.
87°
72°
24
Hist. Avg.
86°
72°
25
Hist. Avg.
86°
72°
26
Hist. Avg.
86°
72°
27
Hist. Avg.
86°
72°
28
Hist. Avg.
86°
72°
29
Hist. Avg.
86°
71°
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 87° to 90°, with overnight lows between 71° and 75°. 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.
