Marine Weather and Tide Forecast for San Antonio, TX

FXUS64 KEWX 192348 AFDEWX

Area Forecast Discussion National Weather Service Austin/San Antonio TX 648 PM CDT Thu Jun 19 2025

New AVIATION

DISCUSSION
(Tonight through Thursday)
Issued at 127 PM CDT Thu Jun 19 2025

Key messages:

- Seasonable temperatures continue

- Low (10-30%) rain/storm chances for Today/Friday and again for middle of next week, focused in southern and eastern portions of the region

Mid-level ridging is on the move but currently is centered across New Mexico and the Texas panhandle. Otherwise, the far outer upper level cloud pattern from Hurricane Erick was able to extend into South Texas. Latest satellite imagery shows cumulus cloud streaks over our region, resulting in a partly sunny to partly cloudy sky.
Within these cloud streaks, some isolated low topped showers have been able to establish for locations mainly along and to the south of the I-10 and US highway 90 corridor. Mesoanalysis indicates the PWATs were a tad higher than short term guidance had previously forecast for entering this morning. The sea breeze later today may help spark some additional activity as well. There could be a few lightning strikes with the afternoon heating. Any activity then declines after sunset. With all of this said, most locations will still remain dry and rain free.

Friday looks to trend similar as today with isolated activity that favors our southern and eastern most areas with streamer showers and sea breeze development. Most locations again will stay rain free. The weekend into Monday looks to trend as the driest stretch through the period as a little more concentrated plume of Saharan Dust arrives and brings in lower PWATs over the region. The middle of next week will see the rain/storm chances gradually rise over areas along and east of the I-35 corridor as the PWATs do rise slightly once that plume of Saharan Dust disperses.

Little variation in the temperature department is expected through the upcoming week with seasonable conditions. The afternoon highs are to remain in the low to mid 90s across most locations while overnight lows stay in the low to mid 70s. Portions of the Rio Grande could occasionally near or top 100 degrees through the week ahead. Heat indices will generally peak each afternoon in the mid 90s to around 105 degrees. Winds will feature light to moderate southeast to east-southeasterly breezes through the period.
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