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5-day forecast / Richardson, TX

SundayPartly Sunny96° / 76° 14%
MondayChance Showers And Thunderstorms92° / 75° 41%
TuesdayMostly Sunny93° / 74° 14%
WednesdayMostly Sunny94° / 74° 8%
ThursdayPartly Sunny93° / 72° 2%

Heat Index Hits 99 in Richardson as Afternoon Warmth Persists - Sep 20, 2 PM

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

Richardson residents face a heat index of 99 today with highs near 96F. Showers and thunderstorms are possible tonight and tomorrow, bringing slight relief from the intense warmth.

Reese Janssen

September 20, 20261 min read

National Weather Service radar for North Texas (KFWS)

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

Current Heat and Conditions

Richardson is experiencing very hot conditions this Sunday afternoon. The air temperature stands at 93F, but the heat index makes it feel like 96F. Relative humidity is at 41% with a dew point of 66F. Winds are blowing from the south at 15 mph, though gusts are reported at 11 mph. The sky remains partly cloudy as the day progresses.

Today and Tonight Forecast

Temperatures will climb to a high near 96F today, with heat index values reaching as high as 99. The sky will be partly sunny. South winds will shift to between 5 and 10 mph. There is a slight chance of precipitation at 14%, with new rainfall amounts less than a tenth of an inch possible.

As evening approaches, conditions will change. Tonight will be mostly cloudy with a low around 76F. Southeast winds will drop to around 5 mph. The chance of precipitation rises to 40%. Showers and thunderstorms are likely between 7pm and 10pm, followed by another chance for storms between 10pm and 4am. Rainfall amounts could range between a tenth and a quarter of an inch.

Tomorrow Outlook

Tomorrow will see a high near 92F, offering a slight decrease from today's peak heat. The sky will be mostly sunny with southwest winds around 5 mph. There is a 41% chance of showers and thunderstorms throughout the day. New rainfall amounts are expected to be less than a tenth of an inch.

Safety Reminder

With temperatures and heat indices remaining high, it is important to stay hydrated and limit midday exertion. Check on neighbors who may be vulnerable to extreme heat. As storms become possible tonight and tomorrow, monitor local updates for any changes in timing or intensity.

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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Reese Janssen

Reese Janssen covers weather, storms, and seasonal life around Richardson.

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