Mercedes, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercedes, a city in Hidalgo County, Texas.
This Afternoon
96°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5pm. Mostly sunny, with a high near 96. Heat index values as high as 107. East northeast wind around 12 mph. Chance of precipitation is 30%.
7-day forecast for Mercedes
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 96°F | Chance Showers And Thunderstorms | 12 mph ENE | 26% |
| Tonight | 77°F | Mostly Clear | 0 to 12 mph ENE | 4% |
| Saturday | 99°F | Sunny | 1 to 12 mph ENE | 13% |
| Saturday Night | 76°F | Mostly Clear | 2 to 13 mph ESE | 0% |
| Sunday | 100°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 12 mph ESE | 17% |
| Sunday Night | 77°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 13 mph SE | 17% |
| Monday | 100°F | Sunny then Slight Chance Showers And Thunderstorms | 2 to 13 mph ESE | 24% |
| Monday Night | 77°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 1 to 13 mph ESE | 24% |
| Tuesday | 98°F | Sunny then Chance Showers And Thunderstorms | 1 to 13 mph E | 42% |
| Tuesday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 13 mph ENE | 42% |
| Wednesday | 97°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 14 mph ENE | 44% |
| Wednesday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 1 to 14 mph ENE | 44% |
| Thursday | 97°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 13 mph NE | 44% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms | 2 to 13 mph ENE | 44% |
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 Sep 19, 2026.