San Juan weather in September (North Puerto Rico, Puerto Rico)
What can you expect from the weather in San Juan during September? Here's what the weather might have in store during this month.
In September, San Juan generally has
very high temperatures
and high rainfall.
Anticipate daytime temperatures around 31°C,
while night temperatures can drop to 25°C.
Keep in mind that while these are the average temperatures, there can be days that are even hotter. It's essential to be prepared for such heat. Wearing light, breathable fabrics and protecting yourself from the sun's intensity with hats or shades can make a difference. Hydration is key, so remember to drink plenty of water, especially if you find yourself outdoors for extended periods.
San Juan in September usually receives high rainfall, averaging around 159 mm for the month. It records the year's peak rainfall, often coming down quite heavily. We recommend bringing a poncho, which will keep you dry. When we look at the climate data from the last 30 years, we can expect around 18 days of rain.
With around 236 hours of sunshine, the days are mostly sunny. It gives a pleasant and vibrant feel to the area.
If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit San Juan. January, February, March and December generally stand out with the best circumstances. While May, July, August, September, October and November tend to showcase less optimal conditions.
For an in-depth look at the yearly conditions, visit our specialized San Juan climate page with graphs.
San Juan, monthly averages in September
Min Temperature
25°C
Max Temperature
31°C
Water Temperature
29°C
Chance of Rain
60%
Precipitation
159 mm
Rainy days
18 days
Humidity
76%
Windspeed
11 km/h
Sunshine
236 hours
Percentage Sunshine
64%
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.
perfect weather
pleasant
tolerable
unpleasant
poor
So, what should you wear in San Juan in September?
It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case. With a water temperature of around 29°C 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.
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 every country 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 recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.
