Historical weather data, all-time temperature records, and monthly climate averages for Alpharetta, GA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Alpharetta typically lands right in that sweet spot of spring — highs around 66° and lows near 46°. There's a 43% chance of rain, so the day leans more damp than dry. The date's wild range tells the real story though: it's hit 86° as recently as 2025 and dipped to 34° back in 1951.
Alpharetta's weather has real teeth at the extremes — from a scorching 102° in July 1952 to a brutal -4° in January 1963, a swing of 106 degrees. The wettest single day on record dumped 4.45 inches in October 1962, and a February snowstorm in 1952 dropped 4 inches, a rare feat this far south.
Alpharetta summers are legitimately hot — average highs peak at 90° in late July and early August, with July also being the wettest stretch of the year at over an inch of precip per week. Winter is mild by most standards, with December highs hovering around 49–53°, making the coldest months more grey than brutal. If you're planning a visit, April through early June offers the most comfortable window before the heat and humidity take over.