National Weather Service Forecast for: Bel Air South MD
Issued by: National Weather Service Baltimore, MD/Washington, D.C.
Updated: 2:22 am EDT Aug 20, 2026
 
Today

Today: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 82. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Scattered
Showers then
Showers

 Tonight

Tonight: Showers and thunderstorms likely, mainly before 8pm. Patchy fog between 9pm and 2am. Otherwise, mostly cloudy, with a low around 64. North wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely and
Patchy Fog
then Patchy
Fog
 Friday

Friday: Mostly sunny, with a high near 80. North wind around 6 mph becoming east in the afternoon.
Mostly Sunny


 Friday
Night
Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Increasing clouds, with a low around 67. Light east wind. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely

 Saturday

Saturday: Showers likely before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 81. East wind 3 to 5 mph. Chance of precipitation is 70%.
Showers
Likely

 Saturday
Night
Saturday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Showers
Likely

 Sunday

Sunday: A slight chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Chance
Showers

 Sunday
Night
Sunday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
Chance
Showers then
Mostly Clear

 Monday

Monday: Sunny, with a high near 80.
Sunny
Hi 82 °F Lo 64 °F Hi 80 °F Lo 67 °F Hi 81 °F Lo 67 °F Hi 83 °F Lo 63 °F Hi 80 °F

Hazardous Weather Outlook
 

Today
 
 Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 82. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
 
 Showers and thunderstorms likely, mainly before 8pm. Patchy fog between 9pm and 2am. Otherwise, mostly cloudy, with a low around 64. North wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
 
 Mostly sunny, with a high near 80. North wind around 6 mph becoming east in the afternoon.
Friday Night
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Increasing clouds, with a low around 67. Light east wind. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
 
 Showers likely before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 81. East wind 3 to 5 mph. Chance of precipitation is 70%.
Saturday Night
 
 Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Sunday
 
 A slight chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Sunday Night
 
 A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
Monday
 
 Sunny, with a high near 80.
Monday Night
 
 Mostly clear, with a low around 62.
Tuesday
 
 Sunny, with a high near 80.
Tuesday Night
 
 Partly cloudy, with a low around 64.
Wednesday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 82. Chance of precipitation is 40%.

 

Forecast from NOAA-NWS for Bel Air South MD.