textproduct: Austin/San Antonio

KEY MESSAGES

- Cooler across the Hill Country this afternoon in the wake of the cold front

- Dry and warmer at least through next Saturday

SHORT TERM

(Tonight through Monday night) Issued at 1241 PM CST Sun Dec 21 2025

The frontal boundary that entered the Hill Country during the overnight hours is now across the Coastal Plains as of 12 PM CST. There are mostly cloudy to cloudy skies to the southeast of the Interstate 35 and Coastal Plains areas. Also, as a surface low pressure system wraps around over east Texas, low level moisture is pushing from north to south over the Hill Country providing a mix of clouds. Both of these clouds deck are forecast to break some this afternoon, however, can't rule out locations that may see little sunlight for the rest of today. With that said, opted to lower temperatures across these areas 2 to 3 degrees from NBM guidance. High temperatures are forecast to range from the 60s across the Hill Country (some clouds) to the upper 70s across the Rio Grande (mostly sunny to sunny skies).

Increased moisture returns this evening into Monday with low clouds taking over the local area through the period as the frontal boundary remains stationary across the Coastal Plains. Clouds quickly over spread the local area after midnight with the shallow cool air remaining in place to bring lows to the 40s and 50s. Also, there is the opportunity for patchy to areas and even widespread fog across the Coastal Plains in addition to drizzle.

Clouds take some time to dissipate on Monday morning, however, they finally scatter out for the most part mid to late afternoon as the front washes out. A warming trend is in store for most of the week with Monday's highs in the mid to upper 70s as southerly flow prevails.

LONG TERM

(Tuesday through next Sunday) Issued at 1241 PM CST Sun Dec 21 2025

Dry and above normal temperatures are forecast from Tuesday through at least next Saturday. Forecast highs range from mid to upper 70s and lower 80s for most places with overnight lows in the upper 50s to lower 60s. No rain forecast through the long term period.

AVIATION

(00Z TAFS) Issued at 527 PM CST Sun Dec 21 2025

TAFs are busy for this evening update. A front that is washing away over the area is doing so slightly faster than projected, leading to lighter winds and recovering low level moisture that could setup lots of low ceiling periods over the next 24-30 hours. The first 2-4 hours over I-35 should be VFR, as the late afternoon sun cooked away the ceilings to east of Luling and Bastrop. Dew point temps around 50 along I-35 means that saturation should only take a few hours of daytime cooling under clear skies. The first reformation of cigs could be around 1000-2000 ft while areas not under a CIG may see a few pockets of light fog in the late evening. After midnight conditions should drop off more quickly with several hours of IFR or lower conditions and at least a few hours of LIFR to VLIFR as we get closer to daybreak. There's a possibility this forecast is still to optimistic, but already our leanings are ahead of most of the model trends. The layer of low moisture will remain shallow for Monday, so there could be a wide variability in the timing of any mixing to VFR. For now, we think the an MVFR sky will be the case for most hours between 18Z Monday and 03Z Tuesday.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 54 74 63 79 / 0 0 0 0 Austin Bergstrom Intl Airport 52 75 63 80 / 0 0 0 0 New Braunfels Muni Airport 52 74 61 77 / 0 0 0 0 Burnet Muni Airport 48 74 61 77 / 0 0 0 0 Del Rio Intl Airport 48 76 58 79 / 0 0 0 0 Georgetown Muni Airport 52 76 62 79 / 0 0 0 0 Hondo Muni Airport 49 75 61 79 / 0 0 0 0 San Marcos Muni Airport 51 75 62 80 / 0 0 0 0 La Grange - Fayette Regional 55 76 63 80 / 0 0 0 0 San Antonio Intl Airport 53 74 63 78 / 0 0 0 0 Stinson Muni Airport 54 76 64 79 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.