National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Witham Field Airport (KSUA)

Lat: 27.18°NLon: 80.23°WElev: 13ft.

Fair

82°F

28°C

Humidity 89%
Wind Speed NA
Barometer 29.98 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 4 Sep 10:15 pm EDT
Extended Forecast for

Port St. Lucie FL

  • Tonight

    Tonight: Partly cloudy, with a low around 75. Calm wind.

    Low: 75 °F

    Partly Cloudy

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 91. Heat index values as high as 103. Calm wind becoming southwest around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 91 °F

    Mostly Sunny
    then T-storms
    Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 74. Calm wind.

    Low: 74 °F

    Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 91. Calm wind becoming west southwest around 5 mph. Chance of precipitation is 70%.

    High: 91 °F

    Mostly Sunny
    then T-storms
    Likely

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 74. Calm wind. Chance of precipitation is 60%.

    Low: 74 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Labor Day

    Labor Day: A chance of showers and thunderstorms between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 91. Calm wind becoming west around 5 mph. Chance of precipitation is 80%.

    High: 91 °F

    Chance
    T-storms then
    T-storms

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms, mainly between 8pm and 2am. Low around 74. Calm wind. Chance of precipitation is 80%.

    Low: 74 °F

    T-storms then
    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 90. Calm wind becoming east southeast around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 90 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 2am, then a slight chance of showers. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 60%.

    Low: 75 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 75. Calm wind.
Saturday
Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 91. Heat index values as high as 103. Calm wind becoming southwest around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 74. Calm wind.
Sunday
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 91. Calm wind becoming west southwest around 5 mph. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 74. Calm wind. Chance of precipitation is 60%.
Labor Day
A chance of showers and thunderstorms between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 91. Calm wind becoming west around 5 mph. Chance of precipitation is 80%.
Monday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms, mainly between 8pm and 2am. Low around 74. Calm wind. Chance of precipitation is 80%.
Tuesday
Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 90. Calm wind becoming east southeast around 5 mph in the afternoon. Chance of precipitation is 70%.
Tuesday Night
Showers and thunderstorms likely before 2am, then a slight chance of showers. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 60%.
Wednesday
A chance of showers, then showers and thunderstorms likely after 8am. Mostly sunny, with a high near 90. Light east wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 60%.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming east around 5 mph in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Calm wind.
Friday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.
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ABOUT THIS FORECAST

 
Point Forecast:
Port St. Lucie FL
 27.29°N 80.36°W (Elev. 13 ft)
Last Update:
7:29 pm EDT Sep 4, 2026
Forecast Valid:
10pm EDT Sep 4, 2026-6pm EDT Sep 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation