National Weather Service Forecast for: Alpharetta GA
Issued by: National Weather Service Peachtree City, GA
Updated: 2:26 am EDT Jun 30, 2026
 
Overnight

Overnight: Mostly clear, with a low around 77. Calm wind.
Mostly Clear

 Tuesday

Tuesday: Mostly sunny, with a high near 95. Heat index values as high as 104. Northeast wind around 5 mph.
Mostly Sunny

 Tuesday
Night
Tuesday Night: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 76. East wind around 5 mph becoming calm.
Slight Chance
T-storms then
Mostly Clear
 Wednesday

Wednesday: A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunny then
Slight Chance
T-storms
 Wednesday
Night
Wednesday Night: A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 76. Calm wind.
Slight Chance
T-storms then
Mostly Clear
 Thursday

Thursday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 96.
Sunny then
Slight Chance
T-storms
 Thursday
Night
Thursday Night: A 10 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75.
Slight Chance
T-storms then
Mostly Clear
 Friday

Friday: Sunny, with a high near 96.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 74.
Mostly Clear
Lo 77 °F Hi 95 °F Lo 76 °F Hi 95 °F Lo 76 °F Hi 96 °F Lo 75 °F Hi 96 °F Lo 74 °F

Hazardous Weather Outlook
Heat Advisory
 

Overnight
 
 Mostly clear, with a low around 77. Calm wind.
Tuesday
 
 Mostly sunny, with a high near 95. Heat index values as high as 104. Northeast wind around 5 mph.
Tuesday Night
 
 A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 76. East wind around 5 mph becoming calm.
Wednesday
 
 A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Wednesday Night
 
 A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 76. Calm wind.
Thursday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 96.
Thursday Night
 
 A 10 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75.
Friday
 
 Sunny, with a high near 96.
Friday Night
 
 Mostly clear, with a low around 74.
Independence Day
 
 A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 94.
Saturday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
 
 A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night
 
 A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Monday
 
 Showers and thunderstorms likely. Mostly sunny, with a high near 91. Chance of precipitation is 60%.

 

Forecast from NOAA-NWS for Alpharetta GA.