Humidity Peaks in McKinney as Showers Pass, Heat Builds Tomorrow - Jul 13, 12 PM

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

McKinney residents face high humidity with a dew point of 73F today. Showers and thunderstorms are likely this afternoon, followed by a significant warm-up and heat index reaching 101F tomorrow.

*As of Jul 13, 12 PM local time.*

Current Conditions and Humidity

The air in McKinney is currently quite heavy with moisture. The temperature stands at 81F, but the heat index makes it feel like 85F. This discrepancy is driven by a dew point of 73F and a relative humidity of 79%, creating a muggy atmosphere that can feel oppressive even at moderate temperatures.

Winds are light, blowing from the east southeast at 5 mph with gusts reaching 2 mph. The sky remains mostly cloudy, blocking direct sunlight but trapping heat near the surface.

Today and Tonight Forecast

Showers and thunderstorms are likely to develop throughout the day. The high will reach near 85F before temperatures drop to a low near 72F tonight. There is a 72% chance of precipitation today, with new rainfall amounts between a quarter and half of an inch possible.

As evening sets in, the chance for rain drops to a slight chance before 10pm. Skies will become partly cloudy overnight, and winds will remain light from the east southeast at 0 to 5 mph. Less than a tenth of an inch of new rainfall is expected during this period.

Tomorrow and Safety Notes

Conditions will shift significantly by tomorrow. The high will climb to near 92F, accompanied by heat index values as high as 101F. The sky will be partly sunny, transitioning to a slight chance of showers and thunderstorms after 1pm.

Winds will pick up slightly from the east at 0 to 10 mph. The chance of precipitation is 24%, with less than a tenth of an inch of new rainfall possible. Temperatures will settle to a low near 71F, with heat index values around 98 overnight.

Given the high humidity today and the rising heat index tomorrow, it is important to stay hydrated. Limit midday exertion when possible, especially as temperatures approach the low 90s. Keep an eye on the sky for any developing storms, though no active National Weather Service or NOAA alerts are currently in effect for this area.

Sources

National Weather Service radar

National Weather Service forecast data

Open-Meteo weather data

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