Today | Weather | Thursday, November 20, 2025

Active Weather Warnings

Weather in Lewisville, Texas

12:59 PM

Now

73° F

Feels Like 73°

Precipitation 49 %

Wind 15 mph

UV Index (0 - 11+) 1

Humidity 81 %

Today

Day 73°

Night 63°

Precipitation 99 %

Wind 12 mph

UV Index (0 - 11+) 1

Lewisville Weather Forecast Updated

Last updated on November 20, 2025 at 10:57 AM

Weather Forecast History

Last Year's Weather on This Day (November 20, 2024)

Day

64°

Night

41°

Wind

4 mph

Precipitation

0 %

Air Quality in Lewisville

NOW

23 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 0.83 µg/m³

PM₁₀ 1.15 µg/m³

O₃ 0.025 ppm

NO₂ 1.3 ppb

SO₂ 0.1 ppb

CO 0.09 ppm

NH₃ 0.16 µg/m³

NO 0.07 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 – 0.83 µg/m³

PM₁₀ – 1.15 µg/m³

O₃ – 49.51 µg/m³

NO₂ – 2.4 µg/m³

SO₂ – 0.26 µg/m³

CO – 105.39 µg/m³

NH₃ – 0.16 µg/m³

NO – 0.07 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Lewisville

Severe Immediate Likely

Flash Flood Warning

Flash Flood Warning issued November 20 at 10:34AM CST until November 20 at 1:30PM CST by NWS Fort Worth TX

Nov 20, 10:34 AM → Nov 20, 1:30 PM

FFWFWD

The National Weather Service in Fort Worth has issued a

* Flash Flood Warning for...
Southern Denton County in north central Texas...
Tarrant County in north central Texas...

* Until 130 PM CST.

* At 1034 AM CST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1.5 and 2.5 inches of rain fell early this morning, and an
additional inch of rain has fallen within the last half hour.
Additional rainfall amounts of 1 to 2 inches are forecast over the
next hour or two. Flash flooding is ongoing or expected to begin
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
poor drainage and low lying areas.

* Some locations that will experience flash flooding include...
Dallas, Fort Worth, Arlington, Plano, Irving, Grand Prairie,
Carrollton, Frisco, Denton, Lewisville, Flower Mound, Mansfield,
Euless, Bedford, Grapevine, Haltom City, Keller, Coppell, Hurst
and Burleson.

+ Read More

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Updated: Nov 20, 10:57 AM Source: NWS Alert

Severe Future Possible

Flood Watch

Flood Watch issued November 20 at 2:17AM CST until November 21 at 6:00AM CST by NWS Fort Worth TX

Nov 20, 2:17 AM → Nov 21, 6:00 AM

Two rounds of heavy rain are forecast to move across the watch
area, one continuing through this morning and another this afternoon
and night. The main threat through this morning will be urban
flooding and minor flooding of flood prone locations. The flash
flood threat will be higher this afternoon and night when additional
heavy rain moves over already water loaded soils.

WHAT: Flooding caused by excessive rainfall continues to be
possible.

WHERE: A portion of north central Texas, including the following
counties, Collin, Dallas, Denton, Ellis, Erath, Hill, Hood, Hunt,
Johnson, Kaufman, Navarro, Parker, Rockwall, Somervell, Tarrant
and Wise.

WHEN: Through late tonight.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor-drainage and urban areas.

ADDITIONAL DETAILS:
- Rainfall totals of 1 to 2 inches, with isolated higher
amounts up to 4 inches.

+ Read More

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Updated: Nov 20, 10:57 AM Source: NWS Alert