Sunnyvale, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sunnyvale, a town in Dallas County, Texas.
Today
102°F
Sunny
Sunny. High near 102, with temperatures falling to around 100 in the afternoon. Heat index values as high as 105. South wind 5 to 10 mph.
7-day forecast for Sunnyvale
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 102°F | Sunny | 5 to 10 mph S | 0% |
| Tonight | 77°F | Mostly Clear | 5 to 10 mph S | 0% |
| Wednesday | 101°F | Sunny | 5 to 10 mph S | 0% |
| Wednesday Night | 77°F | Mostly Clear | 5 to 10 mph S | 0% |
| Thursday | 100°F | Sunny | 5 to 10 mph S | 1% |
| Thursday Night | 77°F | Mostly Clear | 5 to 10 mph SSE | 1% |
| Friday | 97°F | Sunny | 5 to 10 mph S | 9% |
| Friday Night | 76°F | Mostly Clear | 5 to 10 mph SSE | 9% |
| Saturday | 97°F | Sunny | 5 to 10 mph S | 9% |
| Saturday Night | 76°F | Mostly Clear | 5 to 10 mph SSE | 9% |
| Sunday | 97°F | Sunny | 5 to 10 mph S | 5% |
| Sunday Night | 76°F | Mostly Clear | 10 mph SSE | 5% |
| Monday | 97°F | Sunny | 10 mph S | 6% |
| Monday Night | 76°F | Mostly Clear | 10 mph S | 6% |
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
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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 Aug 4, 2026.