Hourly Weather Forecast for Alpharetta, Georgia

Hourly Weather | Today › Wednesday, March 18, 2026

Active Weather Warnings

Freeze Warning

Alpharetta, Georgia

10 AM

36°

Feels Like 39°

Humidity: 46%

UV Index: 2

Wind: 5 mph

11 AM

41°

Feels Like 46°

Humidity: 37%

UV Index: 2

Wind: 5 mph

12 PM

45°

Feels Like 54°

Humidity: 31%

UV Index: 3

Wind: 4 mph

1 PM

48°

Feels Like 54°

Humidity: 29%

UV Index: 2

Wind: 4 mph

2 PM

50°

Feels Like 55°

Humidity: 28%

UV Index: 2

Wind: 4 mph

3 PM

52°

Feels Like 55°

Humidity: 27%

UV Index: 2

Wind: 4 mph

4 PM

54°

Feels Like 55°

Humidity: 27%

UV Index: 1

Wind: 5 mph

5 PM

54°

Feels Like 54°

Humidity: 29%

UV Index: 1

Wind: 6 mph

6 PM

54°

Feels Like 54°

Humidity: 31%

UV Index: 1

Wind: 5 mph

7 PM

52°

Feels Like 52°

Humidity: 34%

UV Index: 0

Wind: 4 mph

8 PM

48°

Feels Like 50°

Humidity: 41%

UV Index: 0

Wind: 4 mph

9 PM

46°

Feels Like 46°

Humidity: 47%

UV Index: 0

Wind: 4 mph

10 PM

43°

Feels Like 45°

Humidity: 53%

UV Index: 0

Wind: 4 mph

11 PM

39°

Feels Like 41°

Humidity: 59%

UV Index: 0

Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

10 AM

42 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 6.06 µg/m³
PM₁₀: 9.53 µg/m³
O₃: 0.046 ppm
NO₂: 4 ppb
SO₂: 1.4 ppb
CO: 0.15 ppm

Health Recommendations:

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

11 AM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.91 µg/m³
PM₁₀: 9.23 µg/m³
O₃: 0.047 ppm
NO₂: 3.6 ppb
SO₂: 1.4 ppb
CO: 0.15 ppm

Health Recommendations:

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

12 PM

52 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.04 µg/m³
PM₁₀: 6.11 µg/m³
O₃: 0.055 ppm
NO₂: 2 ppb
SO₂: 1.2 ppb
CO: 0.13 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

1 PM

61 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.47 µg/m³
PM₁₀: 5.09 µg/m³
O₃: 0.058 ppm
NO₂: 1.3 ppb
SO₂: 1.1 ppb
CO: 0.13 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

2 PM

66 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.77 µg/m³
PM₁₀: 5.38 µg/m³
O₃: 0.059 ppm
NO₂: 1 ppb
SO₂: 1 ppb
CO: 0.13 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

3 PM

74 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.7 µg/m³
PM₁₀: 5.28 µg/m³
O₃: 0.062 ppm
NO₂: 0.8 ppb
SO₂: 0.9 ppb
CO: 0.13 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 PM

78 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.94 µg/m³
PM₁₀: 4.42 µg/m³
O₃: 0.063 ppm
NO₂: 0.6 ppb
SO₂: 0.8 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 PM

77 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.73 µg/m³
PM₁₀: 4.22 µg/m³
O₃: 0.063 ppm
NO₂: 0.6 ppb
SO₂: 0.7 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 PM

62 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.85 µg/m³
PM₁₀: 5.2 µg/m³
O₃: 0.058 ppm
NO₂: 1.2 ppb
SO₂: 0.7 ppb
CO: 0.13 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 PM

46 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.11 µg/m³
PM₁₀: 6.78 µg/m³
O₃: 0.050 ppm
NO₂: 2.6 ppb
SO₂: 0.5 ppb
CO: 0.14 ppm

Health Recommendations:

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

8 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.41 µg/m³
PM₁₀: 7.96 µg/m³
O₃: 0.043 ppm
NO₂: 4.2 ppb
SO₂: 0.4 ppb
CO: 0.15 ppm

Health Recommendations:

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

9 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.7 µg/m³
PM₁₀: 8.7 µg/m³
O₃: 0.039 ppm
NO₂: 4.9 ppb
SO₂: 0.4 ppb
CO: 0.16 ppm

Health Recommendations:

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

10 PM

33 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.99 µg/m³
PM₁₀: 9.35 µg/m³
O₃: 0.036 ppm
NO₂: 5.1 ppb
SO₂: 0.3 ppb
CO: 0.17 ppm

Health Recommendations:

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

11 PM

31 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.29 µg/m³
PM₁₀: 9.95 µg/m³
O₃: 0.033 ppm
NO₂: 5 ppb
SO₂: 0.2 ppb
CO: 0.18 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Alpharetta

Moderate Expected Likely

Freeze Warning

Freeze Warning issued March 17 at 8:57PM EDT until March 18 at 10:00AM EDT by NWS Peachtree City GA

Mar 17, 11:00 PM → Mar 18, 10:00 AM

WHAT: Sub-freezing temperatures as low as 22 expected.

WHERE: Portions of central, east central, north central,
northeast, northwest, southeast, and west central Georgia.

WHEN: Until 10 AM EDT Wednesday.

IMPACTS: Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

+ Read More

Take steps now to protect tender plants from the cold. To prevent water pipes from freezing; wrap or drain or allow them to drip slowly.

Updated: Mar 18, 8:37 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Alpharetta

Freeze Warning

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