S
M
T
W
T
F
S
30
97°
75°
31
97°
75°
1
96°
74°
2
97°
75°
3
96°
73°
4
93°
71°
5
94°
72°
6
93°
72°
7
94°
74°
8
95°
75°
9
95°
75°
10
94°
74°
11
95°
75°
12
95°
74°
13
94°
74°
14
95°
73°
15
95°
74°
16
93°
74°
17
94°
73°
18
94°
73°
19
93°
72°
20
93°
71°
21
92°
72°
22
94°
72°
23
93°
71°
24
93°
72°
25
94°
67°
26
Hist. Avg.
91°
71°
27
Hist. Avg.
91°
71°
28
Hist. Avg.
90°
70°
29
Hist. Avg.
90°
70°
30
Hist. Avg.
90°
70°
1
Hist. Avg.
90°
70°
2
Hist. Avg.
90°
70°
3
Hist. Avg.
90°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Sebastian
Sebastian's September 2026 forecast shows daily high temperatures ranging from 92° to 97°, with overnight lows between 67° and 75°. The average high for September is 94° with an average low of 73°. 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 Sebastian. See also: October | November | December.
