textproduct: Austin/San Antonio

KEY MESSAGES

- Fog likely overnight tonight; dense fog possible again.

- Unseasonably warm weather continues through the week.

- Cooler temperatures start of next week.

SHORT TERM

(Tonight through Wednesday night) Issued at 1257 PM CST Tue Dec 23 2025

High pressure will continue to dominate over Texas through the short term period. The next few days will feel more like mid- October than late December. Low temperatures will be mostly in the middle to upper 60s, and highs will be from the middle 70s to lower 80s. The warm, moist air will result in fog developing tonight after midnight. Dense fog will be possible again Wednesday morning, but we are not confident enough about the location to issue an advisory at this time. Temperatures may approach records, both warm lows and highs. Record warm lows are more likely in the short term.

LONG TERM

(Thursday through next Tuesday) Issued at 1257 PM CST Tue Dec 23 2025

The strong upper ridge will remain, but gradually weaken over the first few days of the long term. Unseasonably warm temperatures will continue through the rest of the week. Record highs for Christmas are significantly higher than the 24th or 26th (see the table below) and are safe for this year. However, Friday and Saturday our forecast is close to the records. Sunday a cold front will move through our CWA bringing relief from the "heat". Unfortunately, it won't bring much relief to the drought. There will only be about a 20% chance for any rain, and this will be confined to the Coastal Plains and Rio Grande regions. High temperatures behind the front Sunday will be 5-10 degrees cooler than Saturday. Low temperatures Monday will be around 20 degrees cooler than Sunday and back to near normal. Highs Monday will also be near normal mostly in the 50s. Tuesday morning freezing temperatures are likely over the Hill Country and possible for the I-35 Corridor.

AVIATION

(00Z TAFS) Issued at 553 PM CST Tue Dec 23 2025

Isolated SHRA activity east of SAT and south of AUS is forecast to dissipate over the next hour. Otherwise, VFR conditions through the evening hours across South-Central Texas. HREF probabilities are very high that low stratus will gradually re- develop 05Z-09Z across the Coastal Plains, I-35 corridor, and Hill Country, spreading westward to the Rio Grande 09Z-12Z Wednesday. Ceilings should gradually lower into IFR through this time frame, and HREF is indicating a 70-100% chance of LIFR ceilings across the region by around 12Z, including at AUS and SAT. HREF is indicating the highest probabilities of seeing 1/2SM visibility or less through portions of the central and western Hill Country, although SAT, AUS, and DRT will need to be watched closely, where probabilities are around 50-60%. Conditions are forecast to slowly improve 15Z-19Z Wednesday.

CLIMATE

Issued at 1257 PM CST Tue Dec 23 2025

Record High Temperatures

12-24 12-25 12-26 12-27 Austin Bergstrom 82 (1977/1964) 91 (1955) 85 (2016) 82 (2024) Austin Camp Mabry 82 (1964/1955) 90 (1955) 84 (2016) 79 (2021/1954) San Antonio 83 (1964) 90 (1955) 83 (2016/2008) 82 (2005) Del Rio 89 (1955) 87 (1955) 80 (2024) 84 (2005)

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 64 78 64 79 / 0 0 0 0 Austin Bergstrom Intl Airport 65 80 63 79 / 0 0 0 0 New Braunfels Muni Airport 64 78 62 78 / 0 0 0 0 Burnet Muni Airport 63 77 63 78 / 0 0 0 0 Del Rio Intl Airport 64 77 61 81 / 0 0 0 0 Georgetown Muni Airport 64 79 63 79 / 0 0 0 0 Hondo Muni Airport 63 80 62 80 / 10 0 0 0 San Marcos Muni Airport 63 80 62 79 / 0 0 0 0 La Grange - Fayette Regional 65 79 63 79 / 0 0 0 0 San Antonio Intl Airport 66 78 65 78 / 10 0 0 0 Stinson Muni Airport 66 80 65 80 / 10 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.