Climate averages 1991–2020
Mayagüez weather
in September.
A hot, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Mayagüez: daytime highs average 30.6°C and nights cool to about 25.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 98 mm of rain on roughly 17 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 15 min on an average September day.
The nearest other city in this atlas is Arecibo (54 km away). In September its highs average 31.2°C, 0.6°C warmer than Mayagüez, with 154 mm of rain.
Among the 7 cities listed in Puerto Rico, Mayagüez ranks 5th of 7 for the warmest September highs and 1st of 7 for the driest September (rainfall, lowest first). The mean September high of those 7 cities is 30.7°C; Mayagüez is 0.1°C cooler than that mean.
From September to October, average highs fall by 0.6°C to 29.9°C, and monthly rainfall falls from 98 mm to 71 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mayagüez climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.8°C22.8°C | 22.8°C | 16 | 4.9 | 11.211 h |
| February | 28.9°C22.6°C | 22.6°C | 19 | 6.4 | 11.512 h |
| March | 29.0°C22.7°C | 22.7°C | 28 | 9.1 | 12.012 h |
| April | 29.3°C23.5°C | 23.5°C | 36 | 10.5 | 12.513 h |
| May | 29.8°C24.5°C | 24.5°C | 70 | 14.7 | 13.013 h |
| June | 31.0°C25.4°C | 25.4°C | 47 | 13.2 | 13.213 h |
| July | 31.5°C25.7°C | 25.7°C | 51 | 14.4 | 13.113 h |
| August | 31.3°C25.8°C | 25.8°C | 67 | 16.7 | 12.713 h |
| September, selected | 30.6°C25.6°C | 25.6°C | 98 | 17.4 | 12.312 h |
| October | 29.9°C25.2°C | 25.2°C | 71 | 15.6 | 11.712 h |
| November | 29.2°C24.4°C | 24.4°C | 54 | 10.3 | 11.311 h |
| December | 29.0°C23.5°C | 23.5°C | 18 | 4.5 | 11.111 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Arecibo in SeptemberPuerto Rico · 54 kmHigh 31.2°C · Low 24.4°C · 154 mm rain
- Ponce in SeptemberPuerto Rico · 58 kmHigh 29.7°C · Low 24.5°C · 124 mm rain
- Bayamón in SeptemberPuerto Rico · 106 kmHigh 31.1°C · Low 24.6°C · 122 mm rain
- San Juan in SeptemberPuerto Rico · 113 kmHigh 31.2°C · Low 24.5°C · 131 mm rain
- Caguas in SeptemberPuerto Rico · 115 kmHigh 30.1°C · Low 24.6°C · 168 mm rain
- Carolina in SeptemberPuerto Rico · 126 kmHigh 30.9°C · Low 24.6°C · 131 mm rain
- Punta Cana in SeptemberDominican Republic · 140 kmHigh 28.9°C · Low 26.0°C · 121 mm rain
- Salvaleón de Higüey in SeptemberDominican Republic · 172 kmHigh 30.2°C · Low 24.2°C · 107 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mayagüez) is explained once on the Mayagüez year overview and on the Sources, method and limits page.