Port St Lucie Weather Forecast
- 73
- 89
Rain Showers Likely
- 73
- 87
Thunderstorms Likely
- 74
- 88
Thunderstorms Likely
- 73
- 87
Chance Thunderstorms
- 70
- 86
Chance Rain Showers
- 70
- 85
Slight Chance Thunderstorms
Today 22 Sep Coastal St. Lucie
Partly sunny late in the morning then becoming mostly cloudy. A chance of Thunderstorms. A chance of Showers late in the Morning, then Showers likely late in the afternoon and towards Sunset. Highs in the upper 80s. South Winds 5 to 10 Mph becoming southeast late in the afternoon and towards Sunset. Chance of rain 60 percent.
Tonight 22 Sep Coastal St. Lucie
Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the mid 70s. Southwest Winds around 5 Mph. Chance of rain 20 percent.
Port St Lucie Temperature Statistics
September Temperature
Witham Field Airport (9.9 miles)
Lowest 7 September, 2026
73.4 °FAverage September
80.9 °FHighest 5 September, 2026
93.2 °F
Climate (2021–2026)
Witham Field Airport (9.9 miles)
Average Low 2021–2026
69.4 °FAverage 2021–2026
74.6 °FAverage High 2021–2026
83.1 °F