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Alton, TX Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Alton, a city in Hidalgo County, Texas.

This Afternoon
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 106. East wind 6 to 9 mph.

7-day forecast for Alton

WhenTempForecastWindPrecip
This Afternoon 98°F Sunny 6 to 9 mph E 8%
Tonight 76°F Mostly Clear 1 to 13 mph SE 3%
Sunday 99°F Mostly Sunny 1 to 8 mph E 2%
Sunday Night 78°F Partly Cloudy 1 to 12 mph ESE 0%
Monday 99°F Sunny then Slight Chance Showers And Thunderstorms 0 to 12 mph E 23%
Monday Night 77°F Slight Chance Showers And Thunderstorms then Mostly Clear 0 to 13 mph E 23%
Tuesday 97°F Sunny then Chance Showers And Thunderstorms 0 to 12 mph ENE 43%
Tuesday Night 78°F Chance Showers And Thunderstorms then Mostly Clear 0 to 12 mph NE 43%
Wednesday 96°F Chance Rain Showers then Chance Showers And Thunderstorms 1 to 13 mph ENE 51%
Wednesday Night 78°F Chance Showers And Thunderstorms 0 to 13 mph NE 51%
Thursday 95°F Chance Rain Showers then Chance Showers And Thunderstorms 2 to 10 mph ENE 48%
Thursday Night 77°F Chance Showers And Thunderstorms 1 to 12 mph ENE 48%
Friday 95°F Chance Rain Showers then Chance Showers And Thunderstorms 2 to 10 mph NE 45%
Friday Night 77°F Chance Showers And Thunderstorms 0 to 12 mph ENE 45%

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 20, 2026.