Sunnyvale, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sunnyvale, a town in Dallas County, Texas.
This Afternoon
99°F
Sunny
Sunny. High near 99, with temperatures falling to around 97 in the afternoon. Heat index values as high as 102. South southeast wind around 5 mph.
7-day forecast for Sunnyvale
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Sunny | 5 mph SSE | 0% |
| Tonight | 73°F | Clear | 5 mph SSE | 0% |
| Saturday | 99°F | Sunny | 5 to 10 mph S | 0% |
| Saturday Night | 74°F | Mostly Clear | 5 to 10 mph S | 0% |
| Sunday | 99°F | Mostly Sunny | 5 mph S | 5% |
| Sunday Night | 74°F | Chance Showers And Thunderstorms | 5 mph S | 38% |
| Monday | 95°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SW | 38% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph NE | 18% |
| Tuesday | 94°F | Mostly Sunny | 5 to 10 mph NNE | 12% |
| Tuesday Night | 71°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 94°F | Mostly Sunny | 5 to 10 mph NE | 8% |
| Wednesday Night | 71°F | Partly Cloudy | 5 to 10 mph ENE | 5% |
| Thursday | 94°F | Mostly Sunny | 5 mph ENE | 4% |
| Thursday Night | 70°F | Partly Cloudy | 5 mph ENE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Sunnyvale (32.800, -96.559). Updated through the day.
Growing snapshot for Sunnyvale
Last spring frost
Mar 10
First fall frost
Nov 19
Growing season
254 days
Hardiness zone
8b
More local growing data for Sunnyvale: nearby ZIP 75182 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
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Duncanville
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Glenn Heights
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Wilmer
Climate data from the nearest NOAA station, Lavon Dam, Tx (16.6 mi from Sunnyvale). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.