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5-day forecast / Allen, TX

TuesdaySunny102° / 81°
WednesdaySunny101° / 82° 1%
ThursdayMostly Sunny101° / 82° 2%
FridayMostly Sunny102° / 82° 6%
SaturdaySunny100° / 77° 8%

Extreme Heat Warning and Air Quality Alert in Effect for Allen - Jul 21, 4 PM

Allen weather, updated every four hours — local forecasts you can trust.

Allen residents face dangerous heat with a heat index of 112F and an active air quality alert. Conditions remain sunny and hot through tomorrow.

Zane Lowery

July 21, 20262 min read

National Weather Service radar for North Texas (KFWS)
National Weather Service radar for North Texas (KFWS)

*As of Jul 21, 4 PM local time.*

Dangerous Heat and Air Quality Concerns

Allen is currently under the influence of an Extreme Heat Warning and an Air Quality Alert. The National Weather Service in Fort Worth has issued these alerts due to the severe heat conditions and poor air quality affecting the region. The heat warning is in effect until July 22 at 8:00PM CDT, while the air quality alert was issued on July 21 at 2:42PM CDT.

Current conditions in Allen reflect the intensity of this heat event. The air temperature stands at 100F, but the heat index makes it feel like 112F. Humidity levels are notable, with a relative humidity of 42% and a dew point of 73F. Winds are light, blowing from the north at 8 mph with gusts reaching 10 mph, under a mostly clear sky.

Forecast for Today and Tomorrow

Today will be sunny with a high near 104F. The heat index is expected to reach as high as 112. Overnight, skies will clear, and temperatures will drop to a low near 83F, though they may rise to around 85F later in the night. The heat index will remain high at 111, with southeast winds between 0 and 5 mph.

Tomorrow remains sunny with a high near 102F. The heat index could climb to 113. Winds will shift to the northeast at 5 to 10 mph.

Temperatures will fall to a low near 79F tomorrow night, potentially rising to 81F overnight. The heat index will drop slightly to 108, with east northeast winds at 5 to 10 mph. The chance of precipitation is minimal, at 0% today and 2% tomorrow.

Safety Reminders

Given the severe heat warning, it is critical to stay hydrated and limit midday exertion. Check on neighbors, especially the elderly and those without air conditioning. Due to the air quality alert, individuals with respiratory conditions should consider limiting outdoor activities. Stay indoors during the hottest parts of the day and seek air-conditioned spaces when possible.

National Weather Service radar for North Texas (KFWS)

Sources

https://radar.weather.gov

https://api.weather.gov

https://open-meteo.com

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Zane Lowery

Zane Lowery covers weather, storms, and seasonal life around Allen.

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