McKinney Heat Advisory: Dangerous Heat Index Expected Through Evening - Sep 16, 2 PM

*As of Sep 16, 2 PM local time.*

Dangerous Heat Conditions

A Heat Advisory is currently in effect for McKinney, signaling dangerous heat conditions for the afternoon and early evening. The air temperature has reached 97F, but the combination of heat and humidity means it feels like 104F. This high heat index value is the primary concern for residents spending time outdoors.

The sky is currently clear, and winds are blowing from the south southeast at 9 mph with gusts up to 11 mph. Relative humidity stands at 42%, with a dew point of 70F, contributing to the muggy feel despite the moderate humidity percentage.

Today and Tonight Outlook

The day will remain sunny with a high near 100F. Temperatures are expected to fall to around 98F in the afternoon, but heat index values will remain as high as 104F. The chance of precipitation is very low at 5%.

As evening approaches, the sky will be mostly clear. Lows will hover around 78F, though temperatures may rise to around 80F overnight. Heat index values could reach 102F during the night, with winds shifting to 5-10 mph from the south southeast.

Tomorrow's Forecast

Tomorrow will bring mostly sunny skies with a high near 99F. Temperatures are expected to dip to around 97F in the afternoon, but the heat index will climb to a maximum of 105F. Winds will be lighter, ranging from 0 to 5 mph from the south southeast.

The chance of precipitation increases slightly to 13%, but rain is not a major factor. Overnight lows will be around 77F, with temperatures potentially rising to 79F. Heat index values may reach 101F.

Given the sustained high heat indices across both days, it is crucial to stay hydrated, limit midday exertion, and check on vulnerable neighbors or pets who may be sensitive to the heat.

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Sources

National Weather Service radar

National Weather Service forecast data

Open-Meteo weather data