September in Puerto Rico is characterized by heavy rainfall and a heightened chance of seeing severe tropical weather. Travelers can rest assured that their vacations will not be ruined as daily storms are generally short lived and occur in the late afternoon.
Typical Weather in September
During September the temperatures in Puerto Rico typically vary between a daily high of about 89.0 degrees and a daily low of approximately 76.0 degrees
| Monthly Averages | | High | Low | Rainfall
(inches) | No. of Days
with Rain |
| 89.0° F |
76.0° F |
5.3 |
N.A. |
|
On any given day during September in Puerto Rico, you can expect early morning temperatures to be around 80.7 degrees.
In September, temperatures typically rise to around 86.5 degrees by early afternoon.
By the early evening hours in September the temperature will generally fall to somewhere in the vicinity of 80.9 degrees.
For the month of September as a whole, temperatures in Puerto Rico average around 81.6 degrees.
| Early Morning | Late Morning | Early Afternoon | Late Afternoon | Early Evening | Overall |
| 80.7° F |
86.3° F |
86.5° F |
84.3° F |
80.9° F |
81.6° F |
|
Rain
During September, rain is most likely to occur around 2:00 PM, and least likely to occur around 5:00 AM.
In Puerto Rico during September, thunderstorms -- when they occur -- are most likely sometime around 2:00 PM.
| Percent Frequencies of Hourly Observations | | Hour | Rain
and/or
Drizzle | Thunder-
storms |
| 2:00 AM |
6.6 % |
1.1 % |
| 5:00 AM |
5.1 % |
1.1 % |
| 8:00 AM |
5.4 % |
0.6 % |
| 11:00 AM |
6 % |
0.7 % |
| 2:00 PM |
9.3 % |
6.3 % |
| 5:00 PM |
6.9 % |
2.8 % |
| 8:00 PM |
5.7 % |
2.1 % |
| 11:00 PM |
6.4 % |
0.7 % |
| ALL |
6.4 % |
1.9 % |
|
