Back to Weather

5-day forecast / Denison, TX

SundayPartly Sunny95° / 73° 8%
MondayChance Showers And Thunderstorms91° / 72° 36%
TuesdayMostly Sunny91° / 71° 13%
WednesdayMostly Sunny92° / 70° 6%
ThursdayPartly Sunny92° / 69° 2%

Denison Heat Index Reaches 100 Degrees as Storms Approach Tonight - Sep 20, 2 PM

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

Denison residents face dangerous heat with a feels-like temperature of 100F this afternoon. While today remains mostly dry, showers and thunderstorms are likely to develop tonight, bringing some relief to the high temperatures.

Briar Iverson

September 20, 20262 min read

National Weather Service radar for North Texas (KFWS)

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

Dangerous Heat Conditions

It is currently Sunday this afternoon in Denison, and the primary concern is the intense heat. The air temperature stands at 95F, but the combination of humidity and heat creates a feels-like temperature of 100F. This level of heat index is considered dangerous, particularly for those spending time outdoors.

The sky is currently overcast, and winds are blowing from the south southwest at 9 mph. Relative humidity is at 42%, with a dew point of 68F. Although the chance of precipitation today is only 8%, the heat remains the dominant factor for the rest of the day.

Temperatures are expected to fall to around 91F in the afternoon, but heat index values will remain as high as 97F. Residents should limit midday exertion and ensure they are well-hydrated to manage the physical stress of the high temperatures.

Tonight’s Storms and Tomorrow’s Outlook

The weather pattern shifts significantly as night falls. A chance of showers and thunderstorms is expected between 7pm and 10pm. These storms are likely to become more frequent between 10pm and 4am, with a 60% chance of precipitation.

New rainfall amounts between a quarter and half of an inch are possible, which may provide some relief from the daytime heat. The low temperature tonight will be around 73F, with southeast winds slowing to 0 to 5 mph. The sky will remain mostly cloudy throughout the night.

Tomorrow brings a cooler high near 91F, with temperatures falling to around 88F in the afternoon. The chance of showers and thunderstorms is 40%, with mostly sunny conditions expected. North winds will be light, ranging from 0 to 5 mph.

Rainfall amounts are expected to be lighter, between a tenth and quarter of an inch. There are no active National Weather Service alerts in effect for the area, but the combination of heat and evening storms requires standard caution. Stay hydrated, monitor the sky for lightning, and avoid driving through standing water if storms develop.

National Weather Service radar for North Texas (KFWS)

Sources

National Weather Service radar

National Weather Service forecast data

Open-Meteo weather data

Share

Briar Iverson

Briar Iverson covers weather, storms, and seasonal life around Denison.

Related Stories

Denison Weather: Steady Heat and Clear Skies - Sep 19, 2 PM

Denison is enjoying a clear, warm afternoon with temperatures near 88F. Today's high will reach 99F, similar to yesterday. Expect mostly sunny conditions with little rain, while tomorrow brings a chance of afternoon storms.

Briar IversonSeptember 19, 20261 min read

More in Sport