Rio Grande Valley/ Weather & Environment

McAllen Sizzles Into Halloween Weekend as Summer Heat Haunts Rio Grande Valley

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Published on October 27, 2026
McAllen Sizzles Into Halloween Weekend as Summer Heat Haunts Rio Grande ValleySource: City of McAllen TX Government

McAllen is starting Tuesday with partly sunny skies and temperatures in the low 70s, but the Rio Grande Valley is headed for a hot afternoon. The high should reach about 90 degrees, with only a slight chance of showers or thunderstorms in the afternoon. The bigger weather story arrives later this week, when temperatures climb into the low 90s for Halloween weekend.

Afternoon Rain Chance Stays Spotty

Tuesday will be partly sunny with calm winds becoming east-southeast at 5 to 7 mph, and the chance of rain is about 20%. Any showers or thunderstorms should be isolated rather than a region-wide washout, according to the National Weather Service.

Wednesday looks mostly sunny with a high near 90 and another slight chance of rain after 1 p.m. Thursday stays warm near 88, though east-southeast winds could gust as high as 22 mph.

Halloween Weekend Brings More Heat

Rain chances fade Friday as partly sunny skies return and temperatures reach around 90 degrees. Saturday is forecast to be sunny with a high near 92, while Sunday is forecast to be sunny with a high near 88, followed by another mostly sunny day Monday with a high near 94.

That makes for a warm stretch for outdoor plans, including Halloween activities, with little rain expected after Thursday. Even with autumn officially in full swing, McAllen's forecast is still serving up plenty of summer leftovers.

Coastal Flood Statement Covers Lower Texas Beaches

A Coastal Flood Statement is in effect from 3 p.m. to midnight Monday for the Lower Texas Coast beaches. The statement does not cover inland McAllen, but residents heading toward South Padre Island or other beach areas should be alert for minor coastal flooding and water pushing toward the dunes around high tide.

Marine conditions are also expected to remain somewhat rough through the week, with easterly swells and occasional stronger afternoon winds. The latest update follows Hoodline's Monday forecast, adding the coastal advisory and extending the warmer trend into early next week.