S
M
T
W
T
F
S
30
90°
77°
31
88°
75°
1
88°
76°
2
88°
77°
3
90°
79°
4
88°
75°
5
90°
78°
6
90°
78°
7
88°
77°
8
90°
75°
9
90°
78°
10
90°
79°
11
90°
79°
12
90°
75°
13
88°
79°
14
88°
77°
15
88°
77°
16
88°
77°
17
90°
75°
18
88°
77°
19
88°
77°
20
85°
76°
21
90°
76°
22
90°
76°
23
91°
76°
24
90°
76°
25
91°
74°
26
89°
77°
27
93°
74°
28
93°
73°
29
92°
74°
30
88°
71°
1
89°
70°
2
88°
71°
3
88°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Arecibo
Arecibo's September 2026 forecast shows daily high temperatures ranging from 85° to 93°, with overnight lows between 70° and 77°. 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 Arecibo. See also: October | November | December.
