S
M
T
W
T
F
S
30
89°
73°
31
87°
72°
1
88°
70°
2
87°
70°
3
87°
70°
4
88°
72°
5
88°
71°
6
89°
71°
7
88°
70°
8
87°
71°
9
88°
71°
10
88°
70°
11
88°
72°
12
88°
71°
13
89°
72°
14
91°
70°
15
91°
72°
16
92°
71°
17
91°
71°
18
90°
70°
19
91°
71°
20
90°
72°
21
91°
72°
22
92°
71°
23
92°
71°
24
91°
70°
25
91°
71°
26
90°
71°
27
92°
70°
28
91°
71°
29
90°
71°
30
91°
69°
1
92°
70°
2
91°
71°
3
90°
70°
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 87° to 92°, with overnight lows between 69° and 73°. The average high for September is 90° with an average low of 71°. 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.
