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Today | Weather | Sunday, March 15, 2026
Active Weather Warnings

Weather in McAllen, Texas

02:50 PM
Now
Cloudy Weather
99° F
Feels Like 100°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 5
Humidity 27 %
Today
Cloudy Weather
Day 106°
Night 57°
Precipitation 4 %
Wind 14 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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.

McAllen Weather Forecast Updated

38 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 15, 2025)
Sunny Weather

Day

93°

Night

59°

Wind

14 mph

UV Index

8

Precipitation

1 %

Air Quality in McAllen

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 9.82 µg/m³
PM10 14.18 µg/m³
O3 0.049 ppm
NO2 0.2 ppb
SO2 0.4 ppb
CO 0.11 ppm
NH3 0.85 µg/m³
NO 0.06 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)
PM2.5 – 9.82 µg/m³
PM10 – 14.18 µg/m³
O3 – 95.43 µg/m³
NO2 – 0.39 µg/m³
SO2 – 1.1 µg/m³
CO – 126.34 µg/m³
NH3 – 0.85 µg/m³
NO – 0.06 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for McAllen

Severe Past Observed

Fire Weather Watch

The Fire Weather Watch has been replaced. Please see the latest information from NWS Brownsville TX on this developing situation.
Mar 15, 10:00 PM → Mar 16, 7:00 PM
The Fire Weather Watch has been replaced. Please see the latest information from NWS Brownsville TX on this developing situation.
+ Read More
A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
Updated: Mar 15, 2:12 PM Source: NWS Alert
Severe Expected Likely

Red Flag Warning

Red Flag Warning issued March 15 at 11:36AM CDT until March 16 at 7:00PM CDT by NWS Brownsville TX
Mar 15, 10:00 PM → Mar 16, 7:00 PM
...ELEVATED TO CRITICAL FIRE WEATHER RISK SUNDAY NIGHT THROUGH
MONDAY AFTERNOON...

.A strong cold front arriving Sunday night brings strong
northerly winds and crashing relative humidity values, leading to
elevated to critical fire weather conditions across all of Deep
South Texas, minus the barrier islands, through Monday afternoon.
Fire weather concerns are further heightened by the fact that
cured fuels remain abundant across our region, which is in an
ongoing D2 to D4 (Severe to Exceptional) Drought.

* WINDS...Northerly at 20 to 30 mph, gusting as high as 35 to 45
mph.

* RELATIVE HUMIDITY...As low as 10-30 percent.

IMPACTS: Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
+ Read More
A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
Updated: Mar 15, 2:12 PM Source: NWS Alert
Moderate Expected Likely

Wind Advisory

Wind Advisory issued March 15 at 11:31AM CDT until March 16 at 1:00PM CDT by NWS Brownsville TX
Mar 15, 10:00 PM → Mar 16, 1:00 PM
WHAT: North winds 20 to 30 mph with gusts up to 45 mph expected.

WHERE: A portion of Deep South Texas.

WHEN: From 10 PM this evening to 1 PM CDT Monday.

IMPACTS: Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.
+ Read More
Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Gusty winds will blow around unsecured objects, such as garbage cans, outdoor furniture, and trampolines. If there is time, trim or remove dead tree limbs.
Updated: Mar 15, 2:12 PM Source: NWS Alert