News Headlines
- WE ARE HIRING: NWS Brownsville/Rio Grande Valley is officially hiring a GS-5/7/9 Meteorologist. Apply today at USAJobs!
- Rapid-Onset (Flash) Drought Continues to Increase Across the RGV/Deep S. Texas Ranchlands. Click Here for Details.
- 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
- 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
Current conditions at
Mid Valley Airport (KTXW)
Lat: 26.18°NLon: 97.97°WElev: 70ft.
Fair
98°F
37°C
| Humidity | 36% |
| Wind Speed | SE 15 G 26 mph |
| Barometer | 29.88 in |
| Dewpoint | 66°F (19°C) |
| Visibility | 10.00 mi |
| Heat Index | 102°F (39°C) |
| Last update | 27 Aug 5:55 pm CDT |
Extended Forecast for
Mercedes TX
Tonight
Low: 78 °F
Clear
Friday
High: 102 °F
Hot
Friday Night
Low: 78 °F
Clear
Saturday
High: 101 °F
Sunny then
Slight Chance
T-stormsSaturday Night
Low: 78 °F
Mostly Clear
Sunday
High: 101 °F
Hot
Sunday Night
Low: 79 °F
Mostly Clear
Monday
High: 101 °F
Hot
Monday Night
Low: 79 °F
Mostly Clear
Detailed Forecast
Tonight
Clear, with a low around 78. South wind 7 to 14 mph, with gusts as high as 23 mph.
Friday
Sunny and hot, with a high near 102. Heat index values as high as 109. East southeast wind 5 to 11 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 78. Southeast wind 8 to 13 mph becoming light south southeast after midnight. Winds could gust as high as 22 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 101. Heat index values as high as 108. Light east southeast wind increasing to 6 to 11 mph in the morning.
Saturday Night
Mostly clear, with a low around 78. South southeast wind 6 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny and hot, with a high near 101. Southeast wind 5 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 79. South southeast wind 9 to 15 mph, with gusts as high as 25 mph.
Monday
Sunny and hot, with a high near 101. South southeast wind 8 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 79. Southeast wind 8 to 16 mph, with gusts as high as 28 mph.
Tuesday
Sunny and hot, with a high near 101. Southeast wind 7 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 79. Southeast wind 7 to 15 mph, with gusts as high as 26 mph.
Wednesday
Sunny and hot, with a high near 100.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 100.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Mercedes TX
26.14°N 97.93°W
26.14°N 97.93°W
6:00 pm CDT Aug 27, 2026
6pm CDT Aug 27, 2026-6pm CDT Sep 3, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
