Today | Weather | Tuesday, March 17, 2026
Active Weather Warnings

Weather in Round Rock, Texas

02:25 AM
Now
Cloudy Night
36° F
Feels Like 36°
Precipitation 0 %
Wind 5 mph
Humidity 44 %
Today
Cloudy Weather
Day 68°
Night 46°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 7

Round Rock Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 17, 2025)
Sunny Weather

Day

86°

Night

57°

Wind

12 mph

UV Index

7

Precipitation

0 %

Air Quality in Round Rock

NOW
48 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.77 µg/m³
PM10 1.84 µg/m³
O3 0.052 ppm
NO2 2.1 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 3.62 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)
PM2.50.77 µg/m³
PM101.84 µg/m³
O3101.19 µg/m³
NO23.92 µg/m³
SO20.97 µg/m³
CO154.25 µg/m³
NH33.62 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Round Rock

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued March 16 at 3:59PM CDT by NWS Austin/San Antonio TX
Mar 16, 3:59 PM Mar 17, 9:00 AM
A light freeze with low temperatures mainly between 30 and 32
degrees is forecast Tuesday morning for most of the Hill Country,
as well as portions of the I-35 corridor and Coastal Plains, with
the aid of light winds and clearing skies. A few of the lowest
lying areas may briefly see temperatures of 27 to 30 degrees.
Freezing temperatures may set in after midnight before all areas
warm above freezing by about 9 AM Tuesday morning.

This cold episode could bring challenges as the growing season may
have started over portions of the region. Therefore, we recommend
to protect Plants, People, and Pets. After Tuesday morning, expect
warmer temperatures to prevail through the rest of the week.
Updated: Mar 17, 1:22 AM Source: NWS Alert