S
M
T
W
T
F
S
30
90°
72°
31
92°
73°
1
92°
74°
2
90°
75°
3
91°
76°
4
89°
75°
5
89°
74°
6
90°
72°
7
92°
74°
8
92°
72°
9
91°
74°
10
92°
73°
11
91°
74°
12
91°
74°
13
90°
73°
14
90°
74°
15
89°
73°
16
89°
74°
17
92°
74°
18
90°
73°
19
88°
73°
20
90°
74°
21
91°
73°
22
89°
74°
23
88°
74°
24
89°
72°
25
89°
72°
26
89°
73°
27
Hist. Avg.
88°
73°
28
Hist. Avg.
88°
73°
29
Hist. Avg.
88°
72°
30
Hist. Avg.
88°
72°
1
Hist. Avg.
88°
72°
2
Hist. Avg.
87°
72°
3
Hist. Avg.
87°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Altamonte Springs
Altamonte Springs's September 2026 forecast shows daily high temperatures ranging from 88° to 92°, with overnight lows between 72° and 76°. The average high for September is 90° 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 Altamonte Springs. See also: October | November | December.
