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Mayaguez Weather in September
During September, Mayaguez experiences very high daytime temperatures of 31°C (88°F) and cooler nights around 26°C (79°F). As the wettest month of the year, expect frequent rainfall.
Rainfall in Mayaguez in September
Being the wettest month, having an umbrella on standby can help you avoid getting caught in the rain. Based on our climate data of the past 30 years, about 17 days of rain are anticipated, with 126 mm (5 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 Mayaguez in September
If you're visiting Mayaguez in September, expect highs of 31°C (88°F) and overnight lows around 26°C (79°F). Mornings and evenings are often more comfortable than the peak afternoon hours. With lows around 26°C (79°F), the nights are warm enough that a sheet is usually all you need for bedding.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, November and December typically offer the best weather for Mayaguez.
Mayaguez Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
56%
Precipitation
126 mm (5 in)
Rainy days
17 days
Mayaguez Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mayaguez - and find the best time to visit.
Daily Historical Temperatures
48-year average (1977-2025)
Based on our historical records, temperatures in Mayaguez 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 Mayaguez in September
Browse day-by-day weather records for Mayaguez spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mayaguez historical weather extremes in September
Based on 26 years of weather observations (1999-2025), these are the most extreme conditions recorded in Mayaguez.
- The hottest September day on record in Mayaguez reached 39°C (102°F) (September 26, 2012).
- Mayaguez experienced its chilliest September day on September 18, 2004, reaching only 26°C (79°F).
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 30, 2014).
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 Mayaguez in September
Warm but pleasant conditions in Mayaguez 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. Expect heavy rainfall, so bring good rain protection and waterproof bags.
What To Do in Mayaguez in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Mayaguez 3-Day Forecast
More climate data for Mayaguez
See the full Mayaguez climate overview or explore weather in Puerto Rico.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Juan
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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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