S
M
T
W
T
F
S
30
87°
75°
31
86°
77°
1
86°
77°
2
86°
77°
3
84°
77°
4
87°
74°
5
90°
75°
6
90°
75°
7
86°
74°
8
87°
79°
9
87°
79°
10
89°
76°
11
88°
75°
12
89°
75°
13
92°
75°
14
89°
76°
15
87°
78°
16
87°
77°
17
83°
75°
18
87°
74°
19
86°
73°
20
86°
72°
21
87°
74°
22
86°
75°
23
86°
73°
24
84°
74°
25
85°
71°
26
84°
74°
27
83°
73°
28
83°
73°
29
83°
72°
30
84°
73°
1
84°
72°
2
83°
71°
3
84°
72°
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 83° to 89°, with overnight lows between 71° and 78°. The average high for September is 85° 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.
