Today | Weather | Monday, January 19, 2026

Weather in Round Rock, Texas

12:51 AM
Now
Night
41° F
Feels Like 37°
Precipitation 0 %
Wind 6 mph
Humidity 38 %
Today
Cloudy Weather
Day 66°
Night 43°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 4

Round Rock Weather Forecast Updated

14 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 19, 2025)
Sunny Weather

Day

39°

Night

21°

Wind

15 mph

UV Index

4

Precipitation

1 %

Air Quality in Round Rock

NOW
32 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.88 µg/m³
PM10 6.72 µg/m³
O3 0.035 ppm
NO2 3.1 ppb
SO2 0.2 ppb
CO 0.14 ppm
NH3 1.07 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)
PM2.53.88 µg/m³
PM106.72 µg/m³
O367.88 µg/m³
NO25.86 µg/m³
SO20.6 µg/m³
CO165.64 µg/m³
NH31.07 µg/m³
NO0 µg/m³