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