Today | Weather | Monday, September 14, 2026

Active Weather Warnings

Heat Advisory

Weather in Round Rock, Texas

09:29 AM

Now

82° F

Feels Like 95°

Precipitation 7 %

Wind 8 mph

UV Index (0 - 11+) 2

Humidity 81 %

Today

Day 99°

Night 79°

Precipitation 25 %

Wind 9 mph

UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Round Rock Weather Forecast Updated

Last updated on September 14, 2026 at 8:25 AM

Weather Forecast History

Last Year's Weather on This Day (September 14, 2025)

Day

93°

Night

72°

Wind

7 mph

UV Index

Precipitation

1 %

Air Quality in Round Rock

NOW

13 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 2.18 µg/m³

PM₁₀ 6.36 µg/m³

O₃ 0.014 ppm

NO₂ 2.4 ppb

SO₂ 0.5 ppb

CO 0.12 ppm

NH₃ 0.4 µg/m³

NO 0.77 µg/m³

PM_2.5 – 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)

PM_2.5 – 2.18 µg/m³

PM₁₀ – 6.36 µg/m³

O₃ – 28.29 µg/m³

NO₂ – 4.47 µg/m³

SO₂ – 1.38 µg/m³

CO – 140.84 µg/m³

NH₃ – 0.4 µg/m³

NO – 0.77 µg/m³

View Hourly Air Quality Forecast

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.

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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, 8:25 AM Source: NWS Alert