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

Hazardous Weather Conditions

Current conditions at

Witham Field Airport (KSUA)

Lat: 27.18°NLon: 80.23°WElev: 13ft.

Fair

84°F

29°C

Humidity 74%
Wind Speed SW 6 mph
Barometer 30.06 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 18 Aug 12:35 am EDT
Extended Forecast for

Port St. Lucie FL

Heat Advisory August 18, 10:00am until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Clear, with a low around 76. Calm wind.

    Low: 76 °F

    Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Sunny and hot, with a high near 96. Heat index values as high as 107. West northwest wind around 5 mph.

    High: 96 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 76. Calm wind.

    Low: 76 °F

    Chance
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of showers, then showers and thunderstorms likely after 11am. Mostly sunny and hot, with a high near 95. Heat index values as high as 107. West wind around 5 mph becoming north in the afternoon. Chance of precipitation is 60%.

    High: 95 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 76. Calm wind. Chance of precipitation is 60%.

    Low: 76 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 94 °F

    Sunny then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 75. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 75 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Friday

    Friday: Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 93. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 93 °F

    Mostly Sunny
    then T-storms
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 75. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 75 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

Detailed Forecast

Overnight
Clear, with a low around 76. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Sunny and hot, with a high near 96. Heat index values as high as 107. West northwest wind around 5 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 76. Calm wind.
Wednesday
A slight chance of showers, then showers and thunderstorms likely after 11am. Mostly sunny and hot, with a high near 95. Heat index values as high as 107. West wind around 5 mph becoming north in the afternoon. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 76. Calm wind. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 75. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Friday
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 93. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 75. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 93. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Saturday Night
Showers and thunderstorms likely. Partly cloudy, with a low around 75. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Sunday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 93. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southeast wind around 5 mph becoming calm in the evening.
Monday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Port St. Lucie FL
 27.27°N 80.34°W (Elev. 7 ft)
Last Update:
12:39 am EDT Aug 18, 2026
Forecast Valid:
12am EDT Aug 18, 2026-6pm EDT Aug 24, 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