S
M
T
W
T
F
S
30
87°
75°
31
86°
77°
1
86°
77°
2
87°
76°
3
87°
76°
4
86°
74°
5
88°
75°
6
89°
74°
7
86°
73°
8
87°
74°
9
88°
75°
10
87°
74°
11
90°
74°
12
89°
76°
13
89°
74°
14
88°
74°
15
89°
75°
16
88°
74°
17
87°
75°
18
84°
75°
19
85°
75°
20
84°
74°
21
85°
75°
22
85°
74°
23
86°
74°
24
86°
73°
25
85°
75°
26
86°
74°
27
86°
74°
28
87°
73°
29
82°
72°
30
83°
72°
1
81°
73°
2
82°
72°
3
83°
71°
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 81° to 90°, with overnight lows between 71° 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.
