National Weather Service

News Headlines

WE ARE HIRING: NWS Brownsville/Rio Grande Valley is officially hiring a GS-5/7/9 Meteorologist. Apply today at USAJobs!
New: October-December2026 Outlook - After a brutally hot and dry September, October brings the pattern change to wetter and less hot, with above average rainfall to close out 2026; flash flooding, water supply, & hazardous marine conditions in focus

Current conditions at

Mid Valley Airport (KTXW)

Lat: 26.18°NLon: 97.97°WElev: 70ft.

Fair

74°F

23°C

Humidity	44%
Wind Speed	N 7 mph
Barometer	30.22 in
Dewpoint	51°F (11°C)
Visibility	10.00 mi
Last update	18 Oct 6:15 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Mercedes TX

Tonight
Low: 66 °F
Mostly Cloudy
Monday
High: 84 °F
Partly Sunny
Monday Night
Low: 71 °F
Slight Chance
Showers then
Mostly Clear
Tuesday
High: 88 °F
Mostly Sunny
Tuesday Night
Low: 71 °F
Mostly Clear
Wednesday
High: 88 °F
Chance
Showers then
Showers
Likely
Wednesday Night
Low: 70 °F
Mostly Clear
Thursday
High: 88 °F
Sunny
Thursday Night
Low: 67 °F
Clear

Detailed Forecast

Tonight

Mostly cloudy, with a low around 66. North northeast wind 5 to 9 mph becoming light north.

Monday

Partly sunny, with a high near 84. North northeast wind 6 to 10 mph, with gusts as high as 20 mph.

Monday Night

A 20 percent chance of showers before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 71. Northeast wind 5 to 10 mph becoming light north northeast. Winds could gust as high as 20 mph.

Tuesday

Mostly sunny, with a high near 88. Northeast wind 6 to 13 mph, with gusts as high as 23 mph.

Tuesday Night

Mostly clear, with a low around 71. Northeast wind 6 to 11 mph becoming light. Winds could gust as high as 21 mph.

Wednesday

A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. North wind 6 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 60%.

Wednesday Night

Mostly clear, with a low around 70. East northeast wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.

Thursday

Sunny, with a high near 88. Light north northeast wind becoming east northeast 5 to 10 mph in the morning. Winds could gust as high as 21 mph.

Thursday Night

Clear, with a low around 67. East wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.

Friday

Sunny, with a high near 89. Light east northeast wind becoming east southeast 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph.

Friday Night

Mostly clear, with a low around 70. East southeast wind 5 to 13 mph, with gusts as high as 22 mph.

Saturday

Mostly sunny, with a high near 90.