News Headlines
- WE ARE HIRING: NWS Brownsville/Rio Grande Valley is officially hiring a GS-5/7/9 Meteorologist. Apply today at USAJobs!
- New: August-October 2026 Outlook - Hotter Than Normal And Mainly Dry Conditions Are Expected To Continue; Could Turn Wetter Towards The Fall; Heat Risk, Drought, Fire Weather, And Water Supply Issues Remain In Focus
- Notice: Rio Grande City NOAA Weather Radio Remains Out of Service Until Further Notice
- Check Out the 2026 Rio Grande Valley/Deep South Texas Hurricane Guide
- Guia de Huracanes 2026 del Valle del Rio Grande/Extremo Sur de Texas
Hazardous Weather Conditions
Current conditions at
Mid Valley Airport (KTXW)
Lat: 26.18°NLon: 97.97°WElev: 70ft.
Mostly Cloudy
92°F
33°C
| Humidity | 58% |
| Wind Speed | S 12 mph |
| Barometer | 30.03 in |
| Dewpoint | 75°F (24°C) |
| Visibility | 10.00 mi |
| Heat Index | 103°F (39°C) |
| Last update | 6 Aug 11:15 am CDT |
Extended Forecast for
Mercedes TX
Today
High: 100 °F
Hot
Tonight
Low: 78 °F
Mostly Clear
Friday
High: 98 °F
Sunny then
Slight Chance
T-stormsFriday Night
Low: 76 °F
Mostly Clear
Saturday
High: 98 °F
Sunny then
Chance
T-stormsSaturday Night
Low: 77 °F
Mostly Clear
Sunday
High: 98 °F
Mostly Sunny
then Slight
Chance
T-stormsSunday Night
Low: 78 °F
Mostly Clear
Monday
High: 99 °F
Sunny
Detailed Forecast
Today
Sunny and hot, with a high near 100. Heat index values as high as 109. South southeast wind 11 to 15 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 78. Southeast wind 6 to 16 mph, with gusts as high as 26 mph.
Friday
A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 98. Heat index values as high as 108. Southeast wind 5 to 14 mph, with gusts as high as 21 mph.
Friday Night
Mostly clear, with a low around 76. East southeast wind 9 to 14 mph becoming light southeast after midnight. Winds could gust as high as 23 mph.
Saturday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 98. Light east wind increasing to 6 to 11 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 77. East wind 8 to 13 mph becoming light southeast after midnight. Winds could gust as high as 21 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Light east wind becoming east southeast 5 to 10 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 78. East southeast wind 6 to 13 mph, with gusts as high as 22 mph.
Monday
Sunny, with a high near 99. South southeast wind 5 to 15 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 79. Southeast wind 9 to 16 mph, with gusts as high as 26 mph.
Tuesday
Sunny and hot, with a high near 100. Southeast wind 9 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 79.
Wednesday
Sunny and hot, with a high near 100. Breezy.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Mercedes TX
26.16°N 97.93°W
26.16°N 97.93°W
11:18 am CDT Aug 6, 2026
11am CDT Aug 6, 2026-6pm CDT Aug 12, 2026
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