National Weather Service Forecast for: Port St. Lucie FL
Issued by: National Weather Service Melbourne, FL
Updated: 6:15 pm EDT Jun 19, 2026
 
Tonight

Tonight: A 50 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 76. South southeast wind 5 to 10 mph becoming light and variable in the evening. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Mostly Cloudy
 Saturday

Saturday: Showers and thunderstorms likely, mainly after 4pm. Mostly sunny, with a high near 91. Heat index values as high as 103. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Mostly Sunny
then T-storms
Likely
 Saturday
Night
Saturday Night: Showers and thunderstorms likely, mainly before 10pm. Mostly cloudy, with a low around 74. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
T-storms
Likely then
Mostly Cloudy
 Sunday

Sunday: Showers and thunderstorms likely, mainly between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly sunny, with a high near 92. Heat index values as high as 103. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Slight Chance
T-storms then
T-storms
Likely
 Sunday
Night
Sunday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm. Chance of precipitation is 60%.
Showers
Likely then
Partly Cloudy
 Monday

Monday: A 50 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 93. Calm wind becoming south southeast around 5 mph in the afternoon.
Sunny then
Chance
T-storms
 Monday
Night
Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming calm.
Chance
T-storms

 Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.
Mostly Sunny
then Chance
T-storms
 Tuesday
Night
Tuesday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm.
Chance
T-storms then
Partly Cloudy
Lo 76 °F Hi 91 °F Lo 74 °F Hi 92 °F Lo 76 °F Hi 93 °F Lo 77 °F Hi 93 °F Lo 76 °F

Heat Advisory
Special Marine Warning
 

Tonight
 
 A 50 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 76. South southeast wind 5 to 10 mph becoming light and variable in the evening. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
 
 Showers and thunderstorms likely, mainly after 4pm. Mostly sunny, with a high near 91. Heat index values as high as 103. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
 
 Showers and thunderstorms likely, mainly before 10pm. Mostly cloudy, with a low around 74. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
 
 Showers and thunderstorms likely, mainly between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly sunny, with a high near 92. Heat index values as high as 103. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Sunday Night
 
 Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm. Chance of precipitation is 60%.
Monday
 
 A 50 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 93. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming calm.
Tuesday
 
 A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm.
Wednesday
 
 A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the afternoon.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm in the evening.
Thursday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Light and variable wind becoming southeast 5 to 10 mph in the afternoon.
Thursday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm in the evening.
Friday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the afternoon.

 

Forecast from NOAA-NWS for Port St. Lucie FL.