Hourly Weather Forecast for Round Rock, Texas

Hourly Weather | Today › Monday, September 14, 2026

Active Weather Warnings

Heat Advisory

Round Rock, Texas

11 AM

90°

Feels Like 100°

Humidity: 64%

UV Index: 5

Wind: 9 mph

12 PM

91°

Feels Like 104°

Humidity: 55%

UV Index: 7

Wind: 9 mph

1 PM

93°

Feels Like 106°

Humidity: 48%

UV Index: 8

Wind: 9 mph

2 PM

97°

Feels Like 106°

Humidity: 43%

UV Index: 7

Wind: 9 mph

3 PM

99°

Feels Like 104°

Humidity: 40%

UV Index: 5

Wind: 9 mph

4 PM

99°

Feels Like 102°

Humidity: 38%

UV Index: 4

Wind: 9 mph

5 PM

99°

Feels Like 100°

Humidity: 39%

UV Index: 2

Wind: 9 mph

6 PM

97°

Feels Like 99°

Humidity: 42%

UV Index: 1

Wind: 10 mph

7 PM

93°

Feels Like 93°

Humidity: 46%

UV Index: 0

Wind: 10 mph

8 PM

91°

Feels Like 93°

Humidity: 51%

UV Index: 0

Wind: 9 mph

9 PM

88°

Feels Like 91°

Humidity: 57%

UV Index: 0

Wind: 9 mph

10 PM

86°

Feels Like 90°

Humidity: 62%

UV Index: 0

Wind: 9 mph

11 PM

84°

Feels Like 90°

Humidity: 68%

UV Index: 0

Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

11 AM

21 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.6 µg/m³
PM₁₀: 4.16 µg/m³
O₃: 0.022 ppm
NO₂: 0.7 ppb
SO₂: 0.5 ppb
CO: 0.11 ppm

Health Recommendations:

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

12 PM

23 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.18 µg/m³
PM₁₀: 2.86 µg/m³
O₃: 0.025 ppm
NO₂: 0.4 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

1 PM

24 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.06 µg/m³
PM₁₀: 2.41 µg/m³
O₃: 0.026 ppm
NO₂: 0.4 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

2 PM

26 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.99 µg/m³
PM₁₀: 2.1 µg/m³
O₃: 0.028 ppm
NO₂: 0.4 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

3 PM

28 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.82 µg/m³
PM₁₀: 1.65 µg/m³
O₃: 0.030 ppm
NO₂: 0.4 ppb
SO₂: 0.2 ppb
CO: 0.10 ppm

Health Recommendations:

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

4 PM

28 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.69 µg/m³
PM₁₀: 1.33 µg/m³
O₃: 0.030 ppm
NO₂: 0.5 ppb
SO₂: 0.2 ppb
CO: 0.09 ppm

Health Recommendations:

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

5 PM

28 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.62 µg/m³
PM₁₀: 1.16 µg/m³
O₃: 0.030 ppm
NO₂: 0.6 ppb
SO₂: 0.2 ppb
CO: 0.10 ppm

Health Recommendations:

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

6 PM

26 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.59 µg/m³
PM₁₀: 1.11 µg/m³
O₃: 0.028 ppm
NO₂: 0.9 ppb
SO₂: 0.2 ppb
CO: 0.10 ppm

Health Recommendations:

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

7 PM

23 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.64 µg/m³
PM₁₀: 1.2 µg/m³
O₃: 0.025 ppm
NO₂: 1.1 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

8 PM

20 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.82 µg/m³
PM₁₀: 1.64 µg/m³
O₃: 0.022 ppm
NO₂: 1.2 ppb
SO₂: 0.3 ppb
CO: 0.11 ppm

Health Recommendations:

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

9 PM

19 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.16 µg/m³
PM₁₀: 2.43 µg/m³
O₃: 0.020 ppm
NO₂: 1.2 ppb
SO₂: 0.3 ppb
CO: 0.11 ppm

Health Recommendations:

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

10 PM

18 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.44 µg/m³
PM₁₀: 3.14 µg/m³
O₃: 0.019 ppm
NO₂: 1.3 ppb
SO₂: 0.3 ppb
CO: 0.11 ppm

Health Recommendations:

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

11 PM

17 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.54 µg/m³
PM₁₀: 3.47 µg/m³
O₃: 0.018 ppm
NO₂: 1.2 ppb
SO₂: 0.3 ppb
CO: 0.11 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 Round Rock

Moderate Expected Likely

Heat Advisory

Heat Advisory issued September 13 at 7:56PM CDT until September 14 at 7:00PM CDT by NWS Austin/San Antonio TX

Sep 14, 12:00 PM → Sep 14, 7:00 PM

WHAT: Heat index values up to 111 expected.

WHERE: The I-35 corridor and Coastal Plains.

WHEN: From noon to 7 PM CDT Monday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Updated: Sep 14, 9:57 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Round Rock

Heat Advisory

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