Puerto Rico in september: average Weather, Temperature and Climate, Where to go?
Weather in Puerto Rico in september 2025
Below, you have access to the weather forecast for the month of september for most popular cities in Puerto Rico. These forecasts are probabilities for the month of september from weather reports for over 10 years. The percentage indicates the possibility of having the weather mentioned.
Average weather in september in San Juan
good weather UV index: 7
Weather at 6am
83°F
Partly Cloudy
44% of time
35%
18%
3%
Weather at 12pm
86°F
Clear/Sunny
54% of time
24%
17%
4%
Weather at 6pm
83°F
Clear/Sunny
46% of time
38%
13%
2%
Weather at 3am
81°F
40%
36%
21%
3%
Where to go in Puerto Rico in september?
Where to go in Puerto Rico in september: destination map
perfect weather
good
tolerable
bad
very bad
Where should you go in Puerto Rico in september when it comes to the weather?
Remember:
The climate in Puerto Rico in september ranges from good to tolerable depending on the region and city.
September is not the best month to go to in Puerto Rico. The weather everywhere is OK but just acceptable: in Arecibo, Caguas, Mayagüez, Bayamón, Ponce and San Juan. The sun is not there all the time and you may be faced the rain frequently. However, if you don't plan a beach and sun trip but rather nature excursions, this climate may be good enough for you. In addition, there are definitely fewer tourists at this time of year.
Climate in Puerto Rico in september
Climate in San Juan in september
In the month of september, the mean temperature in San Juan is 85°F (maximum temperature is 86°F and minimum temperature is 83°F). The climate is very warm around this city in this month. With 4in over 5 days, rainfall can happen for your journey. But this is rather reasonably and you will not be too bothered by it.
With a correct climate, the month of september is okay (but not the best month) for traveling in San Juan.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 83°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 4in | ||
| Number of days with rainfall | 5 day(s) (17%) | ||
| Humidity | 81% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 29% | ||
| Length of day | 12:14 | ||
| Our opinion at whereandwhen.net | good |
Climate in Mayagüez in september
In the month of september, maximum temperature is 88°F and minimum temperature is 83°F (for an average temperature of 85°F). The climate is very hot here in this month. With 10.2in over 15 days, you will experience some showers for your stay. But this is reasonably and it is only of temporary showers.
With a correct climate, september is okay (but not good time) for traveling in this locality in Puerto Rico.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 83°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 10.2in | ||
| Number of days with rainfall | 15 day(s) (49%) | ||
| Humidity | 80% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 23% | ||
| Length of day | 12:14 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Caguas in september
In september, the mean temperature in Caguas is 85°F (maximum temperature is 86°F and minimum temperature is 81°F). The climate is burning around this city in september. With 7.8in over 10 days, you risk getting wet slightly throughout your trip. But this is moderate and it will not be continuous.
With proper weather, september is okay (but not the best month) for traveling in this locality in Puerto Rico.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 81°F | ||
| Rainfall | 7.8in | ||
| Number of days with rainfall | 10 day(s) (34%) | ||
| Humidity | 83% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 34% | ||
| Length of day | 12:14 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Arecibo in september
In the month of september, the mean temperature in Arecibo is 85°F (maximum temperature is 86°F and minimum temperature is 81°F). The climate is burning in this location in september. With 9.1in over 12 days, you risk getting wet slightly for your vacations. But this is rather moderate and it is only of temporary showers.
With a correct climate, september is okay (but not the best time) for traveling there in Puerto Rico.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 81°F | ||
| Sea temperature | 86°F | ||
| Rainfall | 9.1in | ||
| Number of days with rainfall | 12 day(s) (40%) | ||
| Humidity | 81% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 26% | ||
| Length of day | 12:14 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Bayamón in september
In the month of september, the mean temperature in Bayamón is 85°F (maximum temperature is 88°F and minimum temperature is 83°F). The climate is very hot in this location in september. With 4.8in over 5 days, rain may occur for your trip. But this is rather moderate and it is only of temporary showers.
With a correct weather, the month of september is okay (but not good month) for traveling in this locality in Puerto Rico.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 83°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 4.8in | ||
| Number of days with rainfall | 5 day(s) (18%) | ||
| Humidity | 82% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 30% | ||
| Length of day | 12:14 | ||
| Our opinion at whereandwhen.net | good |
All cities in Puerto Rico in september
| San Juan in september | good weather |
| Mayagüez in september | tolerable weather |
| Caguas in september | tolerable weather |
| Arecibo in september | tolerable weather |
| Bayamón in september | good weather |
| Culebra in september | tolerable weather |
| Isla De Mona in september | tolerable weather |
| Ponce in september | tolerable weather |
| Vieques in september | good weather |
| Adjuntas in september | tolerable weather |
| Aguadilla in september | tolerable weather |
| Aibonito in september | tolerable weather |
| Anasco in september | tolerable weather |
| Arroyo in september | tolerable weather |
| Boqueron in september | tolerable weather |
| Cabo Rojo in september | tolerable weather |
| Carolina in september | good weather |
| Cayey in september | tolerable weather |
| Ceiba in september | good weather |
| Cidra in september | tolerable weather |
| Coamo in september | tolerable weather |
| Comerio in september | tolerable weather |
| Dorado in september | tolerable weather |
| Fajardo in september | good weather |
| Florida in september | tolerable weather |
| Guanica in september | tolerable weather |
| Guayama in september | tolerable weather |
| Hatillo in september | tolerable weather |
| Hormigueros in september | tolerable weather |
| Humacao in september | tolerable weather |
| Isabela in september | tolerable weather |
| Luquillo in september | good weather |
| Manati in september | tolerable weather |
| Maunabo in september | tolerable weather |
| Punta Santiago in september | tolerable weather |
| Quebradillas in september | tolerable weather |
| Rincon in september | tolerable weather |
| Salinas in september | tolerable weather |
| San German in september | tolerable weather |
| San Sebastian in september | tolerable weather |
| Santa Isabel in september | tolerable weather |
| Utuado in september | tolerable weather |
| Vega Alta in september | tolerable weather |
| Yauco in september | tolerable weather |
Weather data for Puerto Rico in september:
Weather data for Puerto Rico in september is derived from an average of the weather forecast since 2009 in Puerto Rico. There is a margin of error and these forecasts are to be considered as general information only. The weather in Puerto Rico can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Puerto Rico.