Sinton, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sinton, a city in San Patricio County, Texas.
This Afternoon
92°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5pm. Mostly sunny, with a high near 92. Heat index values as high as 100. East wind around 13 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Sinton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 92°F | Chance Showers And Thunderstorms | 13 mph E | 29% |
| Tonight | 77°F | Mostly Clear | 2 to 13 mph E | 4% |
| Saturday | 93°F | Sunny | 2 to 12 mph ENE | 11% |
| Saturday Night | 76°F | Mostly Clear | 2 to 13 mph SE | 0% |
| Sunday | 94°F | Sunny | 2 to 12 mph E | 4% |
| Sunday Night | 78°F | Partly Cloudy | 3 to 12 mph SE | 4% |
| Monday | 95°F | Sunny then Slight Chance Showers And Thunderstorms | 2 to 12 mph SE | 22% |
| Monday Night | 78°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 to 12 mph SE | 22% |
| Tuesday | 96°F | Slight Chance Showers And Thunderstorms | 2 to 13 mph ENE | 19% |
| Tuesday Night | 78°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 to 13 mph E | 19% |
| Wednesday | 96°F | Sunny then Slight Chance Showers And Thunderstorms | 3 to 13 mph ENE | 15% |
| Wednesday Night | 79°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 to 14 mph E | 15% |
| Thursday | 95°F | Chance Showers And Thunderstorms | 6 to 14 mph ENE | 25% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 5 to 14 mph E | 25% |
Forecast source: National Weather Service (api.weather.gov) for Sinton (28.038, -97.511). Updated through the day.
Growing snapshot for Sinton
Last spring frost
Feb 1
First fall frost
Dec 17
Growing season
324 days
Hardiness zone
9b
More local growing data for Sinton: nearby ZIP 78387 weather · frost dates · planting calendar · Texas frost dates
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Tradewinds
Climate data from the nearest NOAA station, Sinton, Tx (2.7 mi from Sinton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.