S
M
T
W
T
F
S
30
90°
74°
31
88°
73°
1
87°
74°
2
87°
74°
3
86°
73°
4
87°
72°
5
88°
72°
6
89°
73°
7
90°
74°
8
89°
73°
9
90°
74°
10
90°
73°
11
89°
73°
12
90°
72°
13
89°
74°
14
89°
74°
15
87°
73°
16
88°
73°
17
86°
72°
18
86°
71°
19
85°
73°
20
85°
73°
21
86°
70°
22
86°
72°
23
87°
72°
24
86°
70°
25
87°
69°
26
86°
71°
27
86°
73°
28
87°
72°
29
85°
71°
30
87°
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
September Weather in St. Augustine South
St. Augustine South's September 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 69° and 74°. The average high for September is 87° with an average low of 72°. 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 South. See also: October | November | December.
