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5-day forecast / Prosper, TX

ThursdayShowers And Thunderstorms81° / 73° 91%
FridayChance Showers And Thunderstorms80° / 66° 52%
SaturdayChance Showers And Thunderstorms78° / 65° 53%
SundayChance Rain Showers81° / 63° 29%
MondayMostly Sunny81° / 61° 5%

Dangerous Heat Index Hits 104 in Prosper as Storms Loom - Sep 20, 2 PM

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

Prosper residents face a heat index of 104F this afternoon. While skies clear now, showers and thunderstorms are expected tonight and tomorrow with high humidity.

Opal Fields

September 20, 20262 min read

National Weather Service radar for North Texas (KFWS)

*As of Sep 20, 2 PM local time.*

Dangerous Heat Conditions

The sun is beating down on Prosper, TX, creating hazardous conditions for anyone outside. Current air temperatures have reached 97F, but the heat index makes it feel like a dangerous 104F. This intense warmth is compounded by significant moisture in the air; with a dew point of 70F and relative humidity at 42%, the atmosphere feels heavy and stifling.

Winds are currently blowing from the southwest at 14 mph, with gusts reaching up to 20 mph, offering little relief from the oppressive heat.

Forecast for Today and Tonight

Looking ahead, conditions will remain hot but slightly less intense than the current peak. Highs today are expected to settle near 95F, though temperatures may dip to around 92F in the afternoon as the heat index stays high at approximately 98. Skies will be partly sunny with a low chance of precipitation at just 11%.

Winds will shift to the southwest at 5 to 10 mph.

As evening approaches, the weather pattern begins to change. Tonight brings a notable risk for severe weather. Between 7pm and 4am, there is a strong chance for showers and thunderstorms.

The sky will become mostly cloudy with lows near 74F. Winds will ease to an east southeast direction at around 5 mph. Residents should anticipate rainfall amounts between a tenth and a quarter of an inch during this period.

Tomorrow's Outlook

Tomorrow, the threat of storms continues. Highs will reach near 93F, with afternoon temperatures falling to about 91F. The heat index is projected to be as high as 97F.

While skies will turn mostly sunny, there is a 40% chance for showers and thunderstorms throughout the day. Light northwest winds of 0 to 5 mph are expected. Rainfall totals should remain light, likely less than a tenth of an inch.

Safety Reminders

Given the extreme heat index values today and tomorrow, it is critical to stay hydrated and limit midday exertion. Check on elderly neighbors or those without air conditioning. As storms move in tonight and tomorrow, be prepared for sudden changes in weather and potential lightning.

National Weather Service radar for North Texas (KFWS)

Sources

National Weather Service radar

National Weather Service forecast data

Open-Meteo weather data

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Opal Fields

Opal Fields covers weather, storms, and seasonal life around Prosper.

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