S
M
T
W
T
F
S
30
88°
78°
31
88°
78°
1
88°
80°
2
88°
80°
3
85°
81°
4
91°
81°
5
92°
75°
6
92°
78°
7
87°
78°
8
87°
77°
9
88°
79°
10
90°
81°
11
89°
80°
12
90°
76°
13
89°
76°
14
89°
78°
15
91°
80°
16
88°
79°
17
88°
77°
18
87°
77°
19
88°
77°
20
87°
74°
21
88°
73°
22
89°
73°
23
88°
75°
24
87°
74°
25
89°
73°
26
87°
73°
27
87°
72°
28
88°
74°
29
86°
75°
30
87°
74°
1
85°
75°
2
86°
69°
3
85°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Merritt Island
Merritt Island's September 2026 forecast shows daily high temperatures ranging from 85° to 89°, with overnight lows between 69° and 75°. The average high for September is 87° 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 Merritt Island. See also: October | November | December.
