S
M
T
W
T
F
S
30
90°
76°
31
89°
76°
1
88°
75°
2
90°
76°
3
87°
75°
4
85°
75°
5
85°
74°
6
86°
73°
7
85°
71°
8
85°
73°
9
86°
75°
10
85°
75°
11
85°
74°
12
86°
75°
13
87°
74°
14
87°
71°
15
88°
74°
16
88°
74°
17
89°
73°
18
88°
70°
19
87°
71°
20
85°
71°
21
84°
70°
22
85°
70°
23
84°
69°
24
87°
72°
25
86°
71°
26
84°
70°
27
84°
69°
28
85°
70°
29
83°
71°
30
83°
71°
1
84°
70°
2
83°
71°
3
83°
69°
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 90°, with overnight lows between 69° and 76°. The average high for September is 86° 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. See also: October | November | December.
