78009 Weather (Castroville, TX)

Weather forecast for: Castroville TX

Last Update: 1:28 pm CDT Sep 12, 2026

This Afternoon: A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 101. Heat index values as high as 106. Southeast wind around 10 mph.

Tonight: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 9pm. Mostly clear, with a low around 76. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

Sunday: Mostly sunny and hot, with a high near 100. Heat index values as high as 104. South southeast wind 5 to 10 mph.

Sunday Night: Mostly clear, with a low around 76. Southeast wind around 10 mph, with gusts as high as 20 mph.

Monday: Mostly sunny and hot, with a high near 99. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Monday Night: Mostly clear, with a low around 75. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

Tuesday: Sunny and hot, with a high near 100. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Tuesday Night: Mostly clear, with a low around 74. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.

Wednesday: Mostly sunny and hot, with a high near 99. East southeast wind 5 to 10 mph.

Wednesday Night: Partly cloudy, with a low around 74.

Thursday: A 20 percent chance of showers. Mostly sunny, with a high near 97.

Thursday Night: Partly cloudy, with a low around 73.

Friday: Mostly sunny, with a high near 96.