San Juan, TX Weather & Growing Conditions

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

Today

98°F

Sunny

Sunny, with a high near 98. Heat index values as high as 107. Southeast wind 9 to 16 mph, with gusts as high as 28 mph.

7-day forecast for San Juan

When	Temp	Forecast	Wind	Precip
Today	98°F	Sunny	9 to 16 mph SE	1%
Tonight	80°F	Mostly Clear	9 to 16 mph SE	2%
Wednesday	99°F	Mostly Sunny	9 to 14 mph SE	2%
Wednesday Night	80°F	Mostly Clear	7 to 15 mph SE	0%
Thursday	99°F	Sunny	7 to 15 mph SE	7%
Thursday Night	79°F	Mostly Clear	6 to 15 mph SE	7%
Friday	98°F	Sunny then Slight Chance Showers And Thunderstorms	6 to 13 mph SE	16%
Friday Night	78°F	Slight Chance Showers And Thunderstorms then Mostly Clear	3 to 14 mph SE	16%
Saturday	98°F	Sunny	3 to 13 mph ESE	7%
Saturday Night	78°F	Mostly Clear	3 to 13 mph SE	7%
Sunday	98°F	Sunny	2 to 13 mph SE	8%
Sunday Night	79°F	Mostly Clear	7 to 14 mph SE	8%
Monday	99°F	Sunny	7 to 16 mph SE	2%
Monday Night	80°F	Mostly Clear	12 to 16 mph SE	2%

Forecast source: National Weather Service (api.weather.gov) for San Juan (26.190, -98.152). Updated through the day.

Growing snapshot for San Juan

Last spring frost

Jan 9

First fall frost

Jan 3

Growing season

365 days

Hardiness zone

10a

More local growing data for San Juan: nearby ZIP 78589 weather · frost dates · planting calendar · Texas frost dates

Nearby towns & communities

Abram Alamo Alton César Chávez Citrus City Cuevitas Doffing Donna Doolittle Edcouch Edinburg Elias-Fela Solis Elsa Granjeno Harding Gill Tract Hargill Havana Heidelberg Hidalgo Indian Hills La Blanca La Coma Heights La Homa La Joya La Villa Laguna Seca Linn Llano Grande Lopezville Los Ebanos

All Texas locations ›

Climate data from the nearest NOAA station, Mcallen Miller Intl Ap, Tx (6.3 mi from San Juan). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.