Climate averages 1991–2020
Port Saint Lucie weather
in December.
A warm, moderately wet month: the 11th warmest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Port Saint Lucie: daytime highs average 23.2°C and nights cool to about 16.6°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 41 mm of rain on roughly 7 days, which makes December a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 10 h 27 min on an average December day.
The nearest other city in this atlas is West Palm Beach (71 km away). In December its highs average 23.6°C, about as warm as Port Saint Lucie, with 42 mm of rain.
Among the 498 cities listed in the United States, Port Saint Lucie ranks 20th of 498 for the warmest December highs and joint 82nd of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Port Saint Lucie is 12.7°C warmer than that mean.
From December to January, average highs fall by 1.1°C to 22.1°C, and monthly rainfall rises from 41 mm to 51 mm.
The annual picture
December 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 | 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, selected | 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
December in nearby cities
- West Palm Beach in DecemberUnited States · 71 kmHigh 23.6°C · Low 18.0°C · 42 mm rain
- Palm Bay in DecemberUnited States · 86 kmHigh 22.2°C · Low 16.4°C · 45 mm rain
- Boynton Beach in DecemberUnited States · 90 kmHigh 23.9°C · Low 18.0°C · 42 mm rain
- Melbourne, United States in DecemberUnited States · 91 kmHigh 22.0°C · Low 16.3°C · 45 mm rain
- Boca Raton in DecemberUnited States · 107 kmHigh 24.0°C · Low 18.0°C · 43 mm rain
- Deerfield Beach in DecemberUnited States · 111 kmHigh 24.2°C · Low 18.0°C · 43 mm rain
- Coral Springs in DecemberUnited States · 114 kmHigh 24.4°C · Low 17.2°C · 34 mm rain
- Pompano Beach in DecemberUnited States · 120 kmHigh 24.1°C · Low 18.5°C · 43 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.