Alton, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alton, a city in Hidalgo County, Texas.
Today
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 106. East wind 0 to 9 mph.
7-day forecast for Alton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 0 to 9 mph E | 6% |
| Tonight | 77°F | Mostly Clear | 1 to 13 mph ESE | 3% |
| Sunday | 99°F | Mostly Sunny | 1 to 8 mph ESE | 3% |
| Sunday Night | 78°F | Partly Cloudy | 1 to 13 mph ESE | 3% |
| Monday | 99°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 9 mph ESE | 19% |
| Monday Night | 77°F | Slight Chance Showers And Thunderstorms then Clear | 0 to 12 mph ESE | 19% |
| Tuesday | 97°F | Sunny then Chance Showers And Thunderstorms | 1 to 12 mph ENE | 37% |
| Tuesday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph NE | 37% |
| Wednesday | 96°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 12 mph NE | 46% |
| Wednesday Night | 78°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph ENE | 46% |
| Thursday | 95°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 10 mph NE | 51% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms | 1 to 10 mph ENE | 51% |
| Friday | 95°F | Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 10 mph NE | 35% |
| Friday Night | 76°F | Chance Showers And Thunderstorms | 1 to 12 mph ENE | 35% |
Forecast source: National Weather Service (api.weather.gov) for Alton (26.288, -98.309). Updated through the day.
Growing snapshot for Alton
Last spring frost
Jan 23
First fall frost
Dec 28
Growing season
340 days
Hardiness zone
10a
More local growing data for Alton: nearby ZIP 78573 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, La Joya, Tx (2.4 mi from Alton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.