Today | Weather | Tuesday, December 9, 2025

Weather in Round Rock, Texas

07:19 PM
Now
Night
57° F
Feels Like 54°
Precipitation 0 %
Wind 8 mph
Humidity 38 %
Today
Sunny Weather
Day 66°
Night 48°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 3

Round Rock Weather Forecast Updated

22 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 9, 2024)
Night

Day

81°

Night

50°

Wind

6 mph

Precipitation

1 %

Air Quality in Round Rock

NOW
41 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.74 µg/m³
PM10 12.26 µg/m³
O3 0.033 ppm
NO2 8.3 ppb
SO2 0.9 ppb
CO 0.21 ppm
NH3 1.5 µg/m³
NO 0 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)
PM2.59.74 µg/m³
PM1012.26 µg/m³
O365.73 µg/m³
NO215.64 µg/m³
SO22.27 µg/m³
CO238.14 µg/m³
NH31.5 µg/m³
NO0 µg/m³