Climate averages 1991–2020
Port Saint Lucie 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 Port Saint Lucie: daytime highs average 29.6°C and nights cool to about 24.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 139 mm of rain on roughly 20 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 20 min on an average September day.
The nearest other city in this atlas is West Palm Beach (71 km away). In September its highs average 29.3°C, about as warm as Port Saint Lucie, with 179 mm of rain.
Among the 498 cities listed in the United States, Port Saint Lucie ranks joint 145th of 498 for the warmest September highs and joint 470th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Port Saint Lucie is 2.7°C warmer than that mean.
From September to October, average highs fall by 1.9°C to 27.7°C, and monthly rainfall falls from 139 mm to 102 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
Port Saint Lucie climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 22.1°C14.8°C | 14.8°C | 51 | 7.0 | 10.611 h |
| February | 23.5°C15.7°C | 15.7°C | 46 | 6.5 | 11.211 h |
| March | 25.1°C17.2°C | 17.2°C | 57 | 7.0 | 12.012 h |
| April | 27.2°C19.4°C | 19.4°C | 56 | 7.1 | 12.813 h |
| May | 29.2°C21.8°C | 21.8°C | 74 | 9.9 | 13.513 h |
| June | 30.3°C23.9°C | 23.9°C | 121 | 17.6 | 13.814 h |
| July | 31.0°C24.7°C | 24.7°C | 92 | 18.1 | 13.714 h |
| August | 30.9°C24.9°C | 24.9°C | 123 | 21.0 | 13.113 h |
| September, selected | 29.6°C24.3°C | 24.3°C | 139 | 19.7 | 12.312 h |
| October | 27.7°C22.2°C | 22.2°C | 102 | 12.2 | 11.512 h |
| November | 25.1°C19.1°C | 19.1°C | 55 | 8.7 | 10.811 h |
| December | 23.2°C16.6°C | 16.6°C | 41 | 7.3 | 10.510 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
- West Palm Beach in SeptemberUnited States · 71 kmHigh 29.3°C · Low 24.8°C · 179 mm rain
- Palm Bay in SeptemberUnited States · 86 kmHigh 29.0°C · Low 24.4°C · 149 mm rain
- Boynton Beach in SeptemberUnited States · 90 kmHigh 29.5°C · Low 24.8°C · 173 mm rain
- Melbourne, United States in SeptemberUnited States · 91 kmHigh 28.9°C · Low 24.5°C · 149 mm rain
- Boca Raton in SeptemberUnited States · 107 kmHigh 29.6°C · Low 24.6°C · 158 mm rain
- Deerfield Beach in SeptemberUnited States · 111 kmHigh 29.7°C · Low 24.6°C · 158 mm rain
- Coral Springs in SeptemberUnited States · 114 kmHigh 30.1°C · Low 24.1°C · 176 mm rain
- Pompano Beach in SeptemberUnited States · 120 kmHigh 29.6°C · Low 24.8°C · 158 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 Port Saint Lucie) is explained once on the Port Saint Lucie year overview and on the Sources, method and limits page.