S
M
T
W
T
F
S
30
67°
53°
31
70°
51°
1
69°
49°
2
88°
53°
3
65°
49°
4
68°
48°
5
68°
49°
6
67°
46°
7
63°
46°
8
68°
45°
9
88°
75°
10
95°
74°
11
91°
75°
12
92°
74°
13
93°
76°
14
91°
75°
15
87°
73°
16
90°
75°
17
91°
76°
18
89°
75°
19
94°
80°
20
94°
82°
21
95°
80°
22
88°
77°
23
87°
77°
24
87°
76°
25
85°
76°
26
85°
77°
27
86°
76°
28
87°
74°
29
87°
74°
30
88°
75°
1
87°
76°
2
87°
76°
3
88°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Puerto Rico
Puerto Rico's September 2026 forecast shows daily high temperatures ranging from 85° to 95°, with overnight lows between 73° and 82°. The average high for September is 89° with an average low of 76°. 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 Puerto Rico. See also: October | November | December.
