Alpharetta (GA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Alpharetta.
Climate overview of Alpharetta
The climate in Alpharetta, Georgia, United States of America, is marked by large temperature swings across the seasons, ranging from 31°C (88°F) in July to 10°C (50°F) in January.
With around 1245 mm (49 in) of annual rain/snowfall, Alpharetta has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has very warm summers and cold winters. The wettest month is December. May is the sunniest month, averaging 9.6 hours of sunshine per day.
Alpharetta Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Alpharetta - and find the best time to visit.
Monthly Temperature in Alpharetta
In Alpharetta, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a very warm 31°C (88°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 10°C (50°F).
At night, temperatures range from around 20°C (68°F) in July to -1°C (30°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Alpharetta
Alpharetta experiences significant rain/snowfall throughout the year, averaging 1245 mm (49 in) of precipitation annually. Alpharetta experiences moderate seasonal variation in rainfall, with monthly averages ranging from 144 mm (5.7 in) in December, the wettest month, and 78 mm (3.1 in) in June, the driest month. For more details, please visit our Alpharetta Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Alpharetta
Alpharetta can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 9.6 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 5.5 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Alpharetta by Month
The relative humidity is high throughout the year in Alpharetta.
The city experiences its highest humidity in August, reaching 75%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Alpharetta
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, September and October
- Warmest weather: June, July and August
- Most sunshine: May and June
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -1°C (30°F).
Frequently asked questions about the climate in Alpharetta
What is the best time to visit Alpharetta?
April, May, September and October typically offer the most optimal weather in Alpharetta. In contrast, January, February and December tend to have less optimal conditions. Alpharetta has very warm summers and cold winters.
What temperatures can I expect in Alpharetta?
Daytime highs range from 10°C (50°F) in January to 31°C (88°F) in July. Nighttime lows range from -1°C (30°F) to 20°C (68°F). Temperatures vary considerably through the year.
How much rain does Alpharetta get?
Annual rainfall is around 1245 mm (49 in). December is the wettest month with 144 mm (5.7 in), while June is the driest with 78 mm (3.1 in).
How sunny is Alpharetta?
Alpharetta receives around 2,733 hours of sunshine per year. May is the sunniest month with 288 hours, while January is the cloudiest with just 164 hours. Overall, Alpharetta enjoys abundant sunshine.
Alpharetta 3-Day Forecast
Alpharetta (GA) 3-Day Forecast
Alpharetta on the map
Alpharetta is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.