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°
76°
16
87°
75°
17
87°
79°
18
86°
75°
19
86°
72°
20
86°
75°
21
86°
74°
22
86°
74°
23
85°
75°
24
79°
68°
25
74°
65°
26
78°
61°
27
83°
63°
28
87°
68°
29
85°
72°
30
84°
71°
1
86°
75°
2
87°
73°
3
86°
75°
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 78° to 87°, with overnight lows between 61° and 75°. The average high for September is 85° with an average low of 70°. 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.
