Harman US

Sunnyvale, TX Weather & Growing Conditions

Today
100°F
Sunny
Sunny, with a high near 100. Heat index values as high as 104. South wind 5 to 10 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 100°F Sunny 5 to 10 mph S 0%
Tonight 74°F Mostly Clear 5 to 10 mph SSE 0%
Sunday 100°F Mostly Sunny 5 to 10 mph S 8%
Sunday Night 74°F Mostly Cloudy then Chance Showers And Thunderstorms 5 mph SSE 39%
Monday 97°F Chance Showers And Thunderstorms 5 mph W 39%
Monday Night 72°F Slight Chance Showers And Thunderstorms then Partly Cloudy 5 mph NNE 20%
Tuesday 94°F Mostly Sunny 5 to 10 mph NNE 10%
Tuesday Night 70°F Partly Cloudy 5 to 10 mph NE 10%
Wednesday 94°F Mostly Sunny 5 to 10 mph ENE 7%
Wednesday Night 69°F Partly Cloudy 5 mph ENE 3%
Thursday 93°F Mostly Sunny 5 mph E 2%
Thursday Night 69°F Partly Cloudy 5 mph E 1%
Friday 93°F Mostly Sunny 5 mph E 3%
Friday Night 69°F Partly Cloudy 5 mph E 2%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Sunnyvale, TX

Last spring frost
Mar 10
First fall frost
Nov 19
Growing season
254 days
Hardiness zone
8b

Explore more for Sunnyvale, TX: full frost dates · planting calendar · Texas frost dates

Climate data from the nearest NOAA station, Lavon Dam, Tx (16.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.