Alpharetta Weather

Located in Georgia, Alpharetta enjoys a typical humid subtropical climate, which means humid, hot summers and mild to cool winters. The city receives around 50 inches of rain annually, which is almost 2X the national average rainfall of 29 inches for the United States!  In the summer temperatures range from an average high of 80-90 degrees and an average low of 65-70 degrees during the months of June-July. The Alpharetta weather in the Fall is slightly warm with cooler temperatures transitioning into the beginning winter months, experiencing average highs of 55-85 degrees and average lows of 40-65 degrees from September to November. Once it’s winter, Alpharetta weather is mild to cool with an average high temperature range of 50-60° F and average lows of 30-40° F. 

During the summer in Alpharetta, you can expect high temperatures averaging around 80° F with some days peaking in the mid to high 90’s. Alpharetta weather is also relatively humid during the summer months with humidity levels ranging from 70-80% humidity. The hot summer weather in Alpharetta lasts around 4 months from mid-May to mid-September with the hottest month being July. Alpharetta weather after around September 16th cools down and transitions into the Fall season. 

The Fall season begins around the second/third week of September and lasts until early November with temperatures settling down around the mid-60’s. You can expect beautiful leaves and fall activities, events, and festivals in Alpharetta so you can enjoy the true Fall experience! If you’re seeking a more dramatic fall experience, you’re in luck, because Alpharetta is a little over an hour drive to the Blue Ridge Mountains where you can find more fall festivities and see the beautiful colors of the leaves changing. 

Transitioning to Winter, Alpharetta weather begins to cool down around mid/late November with average temperatures falling to the mid 50’s by the end of November. Alpharetta weather enters its cold season in early December with average temperatures around the upper 40’s to low 50’s and lows commonly dipping below 32° F. The winter weather in Alpharetta lasts from early/mid December to late February with the coldest month being January. 

Just like Fall, Spring weather in Alpharetta is full of vibrant colors as trees and other vegetation sprout again, filling the area with lush greenery once again! Spring begins in early March and Alpharetta weather warms up slightly to an average temperature of around 60 degrees, creeping up to the high 60’s by the time April rolls around. 

Fun Facts

1. The hottest temperature ever recorded in Alpharetta was 105° F in July during the Summer of 1980! 
2. The coldest temperature ever recorded in Alpharetta was -10° F in January during the Winter of 1985!