McKinney Heat Advisory in Effect as Temperatures Climb to 100F - Jul 20, 4 AM

*As of Jul 20, 4 AM local time.*

Current Conditions and Alert Status

A Heat Advisory is currently in effect for McKinney, Texas, signaling moderate severity and expected urgency. The National Weather Service has issued this alert to warn residents of dangerously hot conditions. Right now, the air temperature sits at 81F, but the combination of heat and moisture makes it feel like 85F.

The relative humidity is at 79%, with a dew point of 73F, creating a muggy atmosphere. Winds are light at 5 mph with gusts up to 9 mph, and the sky remains clear.

Today and Tonight Forecast

Today will be sunny with a high near 100F. The heat index is expected to reach as high as 108F, making it feel significantly hotter than the actual air temperature. Southwest winds will hover around 5 mph. The chance of precipitation is minimal at just 1%.

As the day transitions to tonight, skies will remain clear. Temperatures will drop to a low near 78F, though they may rise slightly to around 80F during the overnight hours. The heat index will remain elevated, with values as high as 106F. South southwest winds will continue at around 5 mph. Residents should note that the Heat Advisory remains in place through the evening.

Tomorrow Outlook

Tomorrow will also be sunny, with temperatures climbing to a high near 103F. The heat index is forecast to reach 108F again. Winds will shift to the west southwest at 0 to 5 mph.

There is no chance of precipitation, with the probability at 0%. Overnight, conditions will clear with a low near 81F, potentially rising to around 83F. South winds will be light at 0 to 5 mph.

Safety Reminders

Given the active Heat Advisory and extreme heat index values, it is crucial to stay hydrated and limit midday exertion. Check on elderly neighbors and ensure pets have access to cool water and shade. Avoid prolonged exposure to the sun, especially during peak heat hours. If you must be outside, seek air-conditioned spaces frequently and wear lightweight, light-colored clothing.

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Sources

National Weather Service radar

National Weather Service forecast data

Open-Meteo weather data