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Jarealito Weather in September
Jarealito in September sees very high daytime temperatures of 31°C (88°F) and nighttime lows of 25°C (77°F). Rainfall is fairly high this month at around 168 mm (6.6 in), so pack a rain jacket to stay dry.
Rainfall in Jarealito in September
Historically, approximately 17 days this month are expected to have rain, averaging 168 mm (6.6 in). Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Jarealito in September
Temperatures in Jarealito in September top out at 31°C (88°F) and drop to 25°C (77°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Jarealito in September
With approximately 236 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.September in Jarealito has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Jarealito Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
58%
Precipitation
168 mm (6.6 in)
Rainy days
17 days
Humidity
76% *
Sunshine
236 hours *
Percentage Sunshine
64% *
* Data from: San Juan, Puerto Rico (73 KM, 45 Miles).
Jarealito Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Jarealito - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Jarealito typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather records for Jarealito in September
Browse day-by-day weather records for Jarealito spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Jarealito historical weather extremes in September
Based on weather observations in Jarealito between 1976 and 2026, these are the recorded extremes during September.
- The warmest day in September was on September 14, 1999, with a maximum of 37°C (99°F).
- Jarealito experienced its chilliest September day on September 13, 1985, reaching only 26°C (79°F).
- The coldest night in September in Jarealito was on September 27, 1991, with a minimum of 21°C (70°F).
Best Places in Puerto Rico in September
Find out more about the weather in Puerto Rico and which places have the best travel conditions in this month. See all of Puerto Rico in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Jarealito in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Jarealito in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming8/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Jarealito 3-Day Forecast
More climate data for Jarealito
Temperature Rainfall Sunshine Humidity
See the full Jarealito climate overview or explore weather in Puerto Rico.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Juan
31°C (88°F) Fajardo30°C (86°F) Luquillo30°C (86°F) Aguada
30°C (86°F) Rincon
30°C (86°F) Rio Grande31°C (88°F) Culebra30°C (86°F) Vieques30°C (86°F) Bucket list
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