Alpharetta, Georgia Weather
Alpharetta weather this week
Over the next 7 days in Alpharetta, daytime highs range from 13°C to 21°C and night-time lows from 0°C to 9°C. The warmest afternoon is likely on Friday at 21°C, while the coolest night is expected tonight at 0°C. Temperatures trend warmer through the week, rising by about 6°C. Expect a wide gap of around 14°C between afternoon and early-morning temperatures, so mornings will feel noticeably cooler.
No significant rain is expected in Alpharetta this week. The highest rain chance is just 1%, on Saturday.
Winds stay mostly light this week, peaking at about 18 km/h tomorrow. UV levels stay moderate or lower, peaking at 4. Average humidity is a comfortable 44% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Sunday) | Overcast | 13° / 0° | 0% | 0.0 mm | 9 km/h |
| Tomorrow (Monday) | Mainly clear | 13° / 2° | 0% | 0.0 mm | 18 km/h |
| Tuesday | Clear sky | 15° / 5° | 0% | 0.0 mm | 13 km/h |
| Wednesday | Partly cloudy | 17° / 6° | 0% | 0.0 mm | 14 km/h |
| Thursday | Overcast | 19° / 7° | 0% | 0.0 mm | 10 km/h |
| Friday | Mainly clear | 21° / 8° | 0% | 0.0 mm | 6 km/h |
| Saturday | Mainly clear | 20° / 9° | 1% | 0.0 mm | 11 km/h |
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Today's outlook for Alpharetta
At 00:00 local time it is 3°C in Alpharetta under clear skies, feeling like -1°C. Today's forecast high is 13°C and the low is 0°C, and the day overall looks overcast. Rain is unlikely today (0% chance). Winds are blowing at about 7 km/h from the north-west. Humidity is 68%.
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Climate of Alpharetta: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Alpharetta, with average daytime highs around 32°C. January is the coolest, when nights typically fall to about -1°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 33°C, so the seasons feel very different from each other.
The area receives about 1290 mm of rain in a typical year. Most of it falls from December to August (around 78% of the yearly total), and December is the wettest month at roughly 133 mm.
For outdoor plans and travel, September to October usually offer the most comfortable weather in Alpharetta, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 10° | -1° | 107 mm | 82% |
| Feb | 13° | 1° | 118 mm | 82% |
| Mar | 17° | 5° | 119 mm | 80% |
| Apr | 22° | 10° | 100 mm | 78% |
| May | 26° | 15° | 102 mm | 76% |
| Jun | 30° | 19° | 109 mm | 73% |
| Jul | 32° | 21° | 121 mm | 71% |
| Aug | 32° | 20° | 101 mm | 70% |
| Sep | 29° | 17° | 95 mm | 70% |
| Oct | 23° | 10° | 88 mm | 71% |
| Nov | 17° | 4° | 99 mm | 74% |
| Dec | 12° | 1° | 133 mm | 82% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Alpharetta. Values describe typical conditions, not a forecast.
About Alpharetta weather
Alpharetta lies in Georgia's humid subtropical climate, from the coastal plain to the Appalachian foothills — about 37 km north of Atlanta. Expect hot, humid summers (June–August) with highs often above 33°C. Winter brings mild winters (December–February). This page shows live, auto-refreshing weather for Alpharetta: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/New_York.
Frequently asked questions
Alpharetta is about 37 km north of Atlanta, in Georgia.
Alpharetta sees mild winters (December–February).
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Alpharetta's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Alpharetta, with average daytime highs of about 32°C and nights around 21°C.
The coldest nights come in January, when the average low is about -1°C and daytime highs reach around 10°C. Frost is possible on clear, calm nights.
Alpharetta receives about 1290 mm of rain in a typical year. December is the wettest month at roughly 133 mm, and the main rainy period is December to August.
September to October usually offer the most comfortable weather in Alpharetta, with mild daytime temperatures and little rain.
In November Alpharetta typically sees daytime highs near 17°C and lows near 4°C, with about 99 mm of rain over the month and average humidity around 74%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Alpharetta updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Alpharetta's day-to-day weather follows the broader pattern of Georgia described above. See the hourly weather forecast or the air quality index for more detail.