Mercedes, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercedes, a city in Hidalgo County, Texas.
Today
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 108. South southeast wind 9 to 18 mph, with gusts as high as 29 mph.
7-day forecast for Mercedes
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 9 to 18 mph SSE | 1% |
| Tonight | 80°F | Mostly Clear | 9 to 17 mph SE | 2% |
| Wednesday | 100°F | Mostly Sunny | 9 to 16 mph SE | 2% |
| Wednesday Night | 79°F | Mostly Clear | 7 to 16 mph SE | 0% |
| Thursday | 100°F | Sunny | 7 to 16 mph SE | 9% |
| Thursday Night | 79°F | Clear | 5 to 16 mph SE | 9% |
| Friday | 99°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 15 mph SE | 20% |
| Friday Night | 77°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 to 15 mph SE | 20% |
| Saturday | 98°F | Sunny | 2 to 13 mph ESE | 12% |
| Saturday Night | 77°F | Mostly Clear | 3 to 13 mph SE | 12% |
| Sunday | 98°F | Sunny | 2 to 13 mph SE | 11% |
| Sunday Night | 78°F | Mostly Clear | 7 to 14 mph SE | 11% |
| Monday | 99°F | Sunny | 7 to 17 mph SSE | 3% |
| Monday Night | 79°F | Mostly Clear | 10 to 17 mph SE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Mercedes (26.154, -97.913). Updated through the day.
Growing snapshot for Mercedes
Last spring frost
Jan 8
First fall frost
Dec 31
Growing season
365 days
Hardiness zone
10a
More local growing data for Mercedes: nearby ZIP 78570 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, Weslaco, Tx (3.7 mi from Mercedes). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.