Today | Weather | Wednesday, May 20, 2026

Weather in Alpharetta, Georgia

05:53 PM
Now
Stormy Weather
84° F
Feels Like 84°
Precipitation 51 %
Wind 6 mph
UV Index (0 - 11+) 0
Humidity 58 %
Today
Sunny with a Chance of Thunderstorms
Day 90°
Night 64°
Precipitation 58 %
Wind 5 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Alpharetta Weather Forecast Updated

Last updated on

Air Quality in Alpharetta

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.43 µg/m³
PM10 4.01 µg/m³
O3 0.039 ppm
NO2 0.7 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 1.42 µg/m³
NO 0.13 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.52.43 µg/m³
PM104.01 µg/m³
O377 µg/m³
NO21.24 µg/m³
SO20.14 µg/m³
CO112.05 µg/m³
NH31.42 µg/m³
NO0.13 µg/m³