San Juan weather in September (North Puerto Rico, Puerto Rico)

This month is known as a warm month. The average maximum daytime temperature in San Juan in September lies at 31.3°C (88.34°F). The average minimum temperature goes down to around 23.8°C (74.84°F) (often the minimum temperature is noted at night).

September is part of the rainy season with an average precipitation of 272mm (10.7 inches). This makes it the wettest month of the year. There are generally around 16 rainy days. If you enjoy blue skies and sunshine, then this is a great time to go to San Juan with 236 hours of sun during the entire month.

 

San Juan, monthly averages in September

Show in Celsius

Min Temperature 74 °F  

Max Temperature 88 °F  

Water Temperature 84 °F *  

Chance of Rain 56%  

Precipitation 11 in  

Rainy days 17 days  

Humidity 76% *  

Sunshine 236 hrs *  

Percentage Sunshine 64% *  

Where to stay in San Juan

Where to go in Puerto Rico in September

Find out more about the weather in Puerto Rico in September and which places have the best weather conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20-29ºC / 68-84ºF and not too much precipitation (less than 90mm / 3.5inches a month).

So what to wear in September? Visitors traveling to San Juan should plan on bringing a totally waterproof coat since it will often be raining. However, also bring your summer cloths because it can be very warm or even hot. With a water temperature of around 29.0°C (84.2°F), this is a great month to swim so bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in September.

Swimming

8/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in San Juan.

Our site offers climate and forecast data for almost all countries in the world. Are you going to Puerto Rico? On this website you can find historical weather averages for many cities in Puerto Rico. Not sure yet where to go? We now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.