National Weather Service Forecast for: Alpharetta GA
Issued by: National Weather Service Peachtree City, GA
Updated: 10:47 pm EDT Jun 18, 2026
 
Tonight

Tonight: Showers and possibly a thunderstorm before 3am, then a chance of showers and thunderstorms, mainly between 3am and 4am. Some of the storms could produce heavy rainfall. Low around 69. Southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Heavy Rain

 Juneteenth

Juneteenth: A slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny, with a high near 85. Northwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Partly Sunny
then Slight
Chance
T-storms
 Friday
Night
Friday Night: A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 64. Northwest wind around 5 mph becoming calm in the evening.
Slight Chance
T-storms then
Partly Cloudy
 Saturday

Saturday: Partly sunny, with a high near 86. Calm wind becoming southeast around 5 mph.
Partly Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 68. Calm wind.
Partly Cloudy

 Sunday

Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 87. Chance of precipitation is 50%.
Slight Chance
T-storms then
Chance
T-storms
 Sunday
Night
Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
 Monday

Monday: Showers likely and possibly a thunderstorm before 8am, then showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.
Showers
Likely then
T-storms
Likely
 Monday
Night
Monday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
T-storms
Likely then
Showers
Likely
Lo 69 °F Hi 85 °F Lo 64 °F Hi 86 °F Lo 68 °F Hi 87 °F Lo 71 °F Hi 87 °F Lo 70 °F

Flood Watch
Hazardous Weather Outlook
Wind Advisory
 

Tonight
 
 Showers and possibly a thunderstorm before 3am, then a chance of showers and thunderstorms, mainly between 3am and 4am. Some of the storms could produce heavy rainfall. Low around 69. Southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Juneteenth
 
 A slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny, with a high near 85. Northwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Friday Night
 
 A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 64. Northwest wind around 5 mph becoming calm in the evening.
Saturday
 
 Partly sunny, with a high near 86. Calm wind becoming southeast around 5 mph.
Saturday Night
 
 Partly cloudy, with a low around 68. Calm wind.
Sunday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 87. Chance of precipitation is 50%.
Sunday Night
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Monday
 
 Showers likely and possibly a thunderstorm before 8am, then showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.
Monday Night
 
 Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Tuesday
 
 A chance of showers, with thunderstorms also possible after 8am. Partly sunny, with a high near 85. Chance of precipitation is 40%.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Wednesday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Wednesday Night
 
 A slight chance of thunderstorms. Partly cloudy, with a low around 67. Chance of precipitation is 10%.
Thursday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Alpharetta GA.