Today | Weather | Monday, July 27, 2026
Active Weather Warnings

Weather in McKinney, Texas

08:06 AM
Now
Sunny Weather
81° F
Feels Like 88°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 2
Humidity 71 %
Today
Cloudy Weather
Day 99°
Night 79°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

McKinney Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 27, 2025)
Cloudy Night

Day

95°

Night

75°

Wind

8 mph

Precipitation

7 %

Air Quality in McKinney

NOW
19 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.54 µg/m³
PM10 3.32 µg/m³
O3 0.021 ppm
NO2 1.6 ppb
SO2 0.2 ppb
CO 0.07 ppm
NH3 1.67 µg/m³
NO 0.16 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)
PM2.51.54 µg/m³
PM103.32 µg/m³
O340.36 µg/m³
NO23.06 µg/m³
SO20.4 µg/m³
CO85.58 µg/m³
NH31.67 µg/m³
NO0.16 µg/m³

Weather Alerts and Warnings for McKinney

Moderate Expected Likely

Heat Advisory

Heat Advisory issued July 26 at 11:31PM CDT until July 27 at 8:00PM CDT by NWS Fort Worth TX
Jul 26, 11:31 PM Jul 27, 8:00 PM
WHAT: Heat index values around 106 degrees.

WHERE: Portions of North Texas and eastern Central Texas.

WHEN: Until 8 PM CDT Monday.

IMPACTS: Hot temperatures and high humidity will increase the
risk for heat-related illnesses to occur, particularly for
those working or participating in outdoor activities.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, 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 9 1 1.
Updated: Jul 27, 6:59 AM Source: NWS Alert