National Weather Service Forecast for: Fort Mill SC
Issued by: National Weather Service Greenville-Spartanburg, SC
Updated: 9:30 pm EDT Jun 18, 2026
 
Tonight

Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Some of the storms could produce heavy rainfall. Patchy fog after 4am. Low around 69. South southwest wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
and Patchy
Fog
 Juneteenth

Juneteenth: Showers before 11am, then a slight chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rainfall. High near 86. West northwest wind around 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Heavy Rain
then Slight
Chance
T-storms
 Friday
Night
Friday Night: Partly cloudy, with a low around 63. North wind 3 to 5 mph.
Partly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 85. Light and variable wind.
Mostly Sunny

 Saturday
Night
Saturday Night: Mostly clear, with a low around 65. Calm wind.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 90.
Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 70.
Partly Cloudy

 Monday

Monday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
 Monday
Night
Monday Night: A 40 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71.
Chance
T-storms
Lo 69 °F Hi 86 °F Lo 63 °F Hi 85 °F Lo 65 °F Hi 90 °F Lo 70 °F Hi 88 °F Lo 71 °F

 

Tonight
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Some of the storms could produce heavy rainfall. Patchy fog after 4am. Low around 69. South southwest wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Juneteenth
 
 Showers before 11am, then a slight chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rainfall. High near 86. West northwest wind around 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
 
 Partly cloudy, with a low around 63. North wind 3 to 5 mph.
Saturday
 
 Mostly sunny, with a high near 85. Light and variable wind.
Saturday Night
 
 Mostly clear, with a low around 65. Calm wind.
Sunday
 
 Sunny, with a high near 90.
Sunday Night
 
 Partly cloudy, with a low around 70.
Monday
 
 A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 50%.
Monday Night
 
 A 40 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71.
Tuesday
 
 A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Wednesday
 
 Mostly sunny, with a high near 86.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Thursday
 
 Mostly sunny, with a high near 88.

 

Forecast from NOAA-NWS for Fort Mill SC.