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Get ready for a 50° temperature drop! We’ll go from 90s on Sunday to 40s by Monday AM

Gusts up to 50 mph are possible Sunday night

San Antonio will see temperatures in the 90s on Sunday fall to near 40 by Monday morning. (Copyright KSAT-12 2026 - All Rights Reserved)

FORECAST HIGHLIGHTS

  • SUNDAY: Hot. Low-90s. High fire danger
  • SUNDAY NIGHT: Strong cold front. 40-50 mph wind gusts.
  • MONDAY: Near 40° at sunrise. Highs in the 50s. High fire danger
  • TUESDAY MORNING: 30s. Above freezing for San Antonio. Light freeze in Hill Country

FORECAST

SUNDAY

After a brief round of morning clouds, temperatures will skyrocket on Sunday. Dry air will help to push temperatures to the low-90s — potentially breaking a record that’s stood since 1908. Meanwhile, the fire danger will be very high through the evening.

Highs on Sunday will likely reach record levels. (Copyright KSAT-12 2026 - All Rights Reserved)

DINNERTIME COLD FRONT

A strong cold front moves through Sunday between 5 and 7pm. As soon as it arrives, gusty north winds will kick in. Gusts of up to 40-50 mph are possible through midnight.

Winds may gust 40-50 mph Sunday night. (Copyright KSAT-12 2026 - All Rights Reserved)

MONDAY

As we head back to work and school, temps will plummet by Monday morning. San Antonio will dip to near 40, while wind chill values will be in 20s and 30s (see below). After the chilly start, temperatures will struggle to get out of the 50s Monday afternoon.

Forecast wind chill for Monday morning at 7am (Copyright KSAT-12 2026 - All Rights Reserved)

NEAR FREEZING TUESDAY MORNING

Monday night will be cold, and by Tuesday morning, many of us will be in the 30s. While we expect temperatures to stay just above freezing in San Antonio, outlying areas may briefly touch freezing.

Lows Tuesday morning will be near-freezing (Copyright KSAT-12 2026 - All Rights Reserved)

EXTENDED FORECAST

Despite the big temperature swings, no rain is expected for the next 7 to 10 days.

Extended Forecast (Copyright KSAT-12 2026 - All Rights Reserved)

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