Fajardo Weather in September
In Fajardo, September brings very high daytime temperatures around 30°C (86°F), with nights cooling to 26°C (79°F). It is the wettest month of the year, so expect more rainfall than usual.
Rainfall in Fajardo in September
Expect frequent, heavy rain this month, marking the peak rainfall period. A poncho will help protect you from getting soaked. Based on our climate data of the past 30 years, about 18 days of rain are anticipated, with 177 mm (7 in) on average. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Fajardo in September
In September, expect very high temperatures in Fajardo, with highs of 30°C (86°F) and lows of 26°C (79°F) at night. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights remain warm at around 26°C (79°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference. Note that these temperatures are average, but some days may be hotter. Dress in cool, breathable fabrics to stay comfortable in the heat.
Sunshine in Fajardo in September
There are approximately 236 hours of sunshine this month, resulting in mostly clear days.September in Fajardo has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Puerto Rico, check out our Fajardo's climate page.
Fajardo Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Chance of Rain
61%
Precipitation
177 mm (7 in)
Rainy days
18 days
Humidity
76% *
Sunshine
236 hours *
Percentage Sunshine
64% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Fajardo typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Fajardo in September
Browse day-by-day weather records for Fajardo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Fajardo historical weather extremes in September
Based on weather observations in Fajardo between 1976 and 2025, these are the recorded extremes during September.
- On September 24, 2017, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- Fajardo experienced its chilliest September day on September 26, 1997, reaching only 25°C (77°F).
- Nighttime temperatures dropped to 21°C (70°F) on September 28, 1981, marking the coldest September night on record.
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
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tolerable
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What to Wear in Fajardo 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. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Fajardo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Puerto Rico, check out our Fajardo's climate page.
Temperature Rainfall Sunshine Humidity
See the full Fajardo climate overview or explore weather in Puerto Rico.
