News Headlines
- New: September-November 2026 Outlook - Warmer Than Normal Conditions Favored; Precipitation A Toss-Up, But Could Trend Wetter Later This Fall; Heat Risk, Drought, Fire Weather, And Water Supply Issues Remain In Focus
- 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.
- 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.
Fair
81°F
27°C
| Humidity | 83% |
| Wind Speed | SE 6 mph |
| Barometer | 29.93 in |
| Dewpoint | 76°F (24°C) |
| Visibility | 10.00 mi |
| Heat Index | 87°F (31°C) |
| Last update | 31 Aug 6:35 am CDT |
Extended Forecast for
Mercedes TX
Today

High: 102 °F
Hot
Tonight

Low: 78 °F
Mostly Clear
Tuesday

High: 102 °F
Hot
Tuesday Night

Low: 79 °F
Mostly Clear
Wednesday

High: 102 °F
Hot
Wednesday Night

Low: 79 °F
Mostly Clear
Thursday

High: 101 °F
Hot
Thursday Night

Low: 79 °F
Mostly Clear
Friday

High: 102 °F
Hot
Detailed Forecast
Today
Sunny and hot, with a high near 102. Heat index values as high as 108. Southeast wind 6 to 14 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 78. East southeast wind 7 to 15 mph, with gusts as high as 26 mph.
Tuesday
Sunny and hot, with a high near 102. Heat index values as high as 109. Southeast wind 6 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 79. Southeast wind 9 to 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny and hot, with a high near 102. South southeast wind 7 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
Mostly clear, with a low around 79. Southeast wind 9 to 16 mph, with gusts as high as 28 mph.
Thursday
Sunny and hot, with a high near 101. South southeast wind 8 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 79. South southeast wind 8 to 16 mph, with gusts as high as 29 mph.
Friday
Sunny and hot, with a high near 102. Southeast wind 7 to 15 mph, with gusts as high as 24 mph.
Friday Night
Mostly clear, with a low around 79. Southeast wind 5 to 15 mph, with gusts as high as 26 mph.
Saturday
A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 101. Light southeast wind becoming east southeast 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Saturday Night
Mostly clear, with a low around 78.
Sunday
A 40 percent chance of showers and thunderstorms. Sunny and hot, with a high near 100.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Mercedes TX
26.14°N 97.93°W
26.14°N 97.93°W
6:45 am CDT Aug 31, 2026
6am CDT Aug 31, 2026-6pm CDT Sep 6, 2026



