Arecibo Weather in September
Thinking of visiting Arecibo in September? Expect very high temperatures reaching 31°C (88°F) during the day, dropping to 25°C (77°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Arecibo in September
Rain is expected on roughly 17 days, totalling around 170 mm (6.7 in) for the month. 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 Arecibo in September
Temperatures in Arecibo in September top out at 31°C (88°F) and drop to 25°C (77°F) overnight. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Arecibo. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Arecibo's climate page.
Arecibo Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
58%
Precipitation
170 mm (6.7 in)
Rainy days
17 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Arecibo 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 for Arecibo in September
Browse day-by-day weather records for Arecibo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Arecibo historical weather extremes in September
According to our 49 years of weather records for Arecibo, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in Arecibo reached 38°C (100°F) (September 14, 1999).
- On September 13, 1985, Arecibo saw its coldest September day with temperatures maxing out at 26°C (79°F).
- The coldest night in September in Arecibo 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 →
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What to Wear in Arecibo in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything!What To Do in Arecibo 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 Arecibo's climate page.
See the full Arecibo climate overview or explore weather in Puerto Rico.
