Today | Weather | Tuesday, August 25, 2026
Active Weather Warnings

Weather in Lewisville, Texas

07:30 AM
Now
Cloudy Weather
84° F
Feels Like 84°
Precipitation 29 %
Wind 8 mph
UV Index (0 - 11+) 1
Humidity 54 %
Today
Cloudy Weather
Day 106°
Night 84°
Precipitation 55 %
Wind 13 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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.

Lewisville Weather Forecast Updated

8 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 25, 2025)
Cloudy Night

Day

99°

Night

73°

Wind

9 mph

Precipitation

19 %

Air Quality in Lewisville

NOW
22 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.68 µg/m³
PM10 3 µg/m³
O3 0.024 ppm
NO2 1 ppb
SO2 0.2 ppb
CO 0.09 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)
PM2.51.68 µg/m³
PM103 µg/m³
O347.35 µg/m³
NO21.91 µg/m³
SO20.54 µg/m³
CO97.4 µg/m³
NH31.07 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Lewisville

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued August 25 at 12:51AM CDT until August 25 at 9:00PM CDT by NWS Fort Worth TX
Aug 25, 12:51 AM Aug 25, 9:00 PM
WHAT: Dangerously hot conditions with high temperatures up to 109.

WHERE: Portions of North and Central Texas.

WHEN: Until 9 PM CDT this evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.
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Take extra precautions when outside by staying hydrated, wearing lightweight and loose fitting clothing, and limiting strenuous activities to the early morning or evening. Check up on relatives and neighbors. Never leave young children or pets in an enclosed vehicle, even for a short time, as temperatures can quickly rise to life-threatening levels. Know the signs and symptoms of heat exhaustion and heat stroke. To reduce risk when outdoors, the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 911 ASAP if you or someone you know is exhibiting signs of heat stroke. Extreme heat is dangerous, especially for those without reliable shelter. Limit time outdoors during the hottest time of the day, typically from 2 to 7 PM, rest in the shade when possible, and drink plenty of water. Locate nearby cooling centers through local resources or dial 2-1-1 in Texas.
Updated: Aug 25, 7:22 AM Source: NWS Alert