Humacao Weather in September
In Humacao, September brings very high daytime temperatures around 30°C (86°F), with nights cooling to 25°C (77°F). It is the wettest month of the year, so expect more rainfall than usual.
Rainfall in Humacao in September
This month experiences the most intense rain of the year, with heavy showers. Be prepared with a poncho to stay dry. Typically, you can expect about 18 days of rain this month, with 192 mm (7.6 in) on average. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Humacao in September
September in Humacao brings typical temperatures with highs around 30°C (86°F) and lows of 25°C (77°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. With overnight lows of 25°C (77°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Humacao in September
Enjoy a sunny month with about 236 hours of sunshine, the clear skies make Humacao even more beautiful.September in Humacao can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, 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 Humacao's climate page.
Humacao Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Chance of Rain
60%
Precipitation
192 mm (7.6 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 Humacao typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°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 Humacao in September
Browse day-by-day weather records for Humacao spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Humacao historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Humacao.
- The warmest day in September was on September 28, 2025, with a maximum of 34°C (93°F).
- On September 26, 1997, Humacao saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The lowest overnight temperature recorded in September was 21°C (70°F) (September 28, 1981).
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
What to Wear in Humacao in September
Warm but pleasant conditions in Humacao in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Humacao 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 Humacao's climate page.
Temperature Rainfall Sunshine Humidity
See the full Humacao climate overview or explore weather in Puerto Rico.
