South Texas Weather Forecast
Weather forecast for August 18, 2017
August 18 – 20, 2017
Daily Weather Forecast
South Texas Weather Modification Association

Weather Discussion:
Skies are mostly cloudy over hill country this morning, otherwise mostly clear across the rest of
south Texas.  A strong ridge of high pressure continues across the region with partly cloudy
skies this afternoon.  High temperatures in the upper 90’s, lower 100’s with slightly cooler temps
over hill country.  High heat index values likely this afternoon and evening.  Partly cloudy
overnight with mostly cloudy skies over hill country.  Overnight low temps in the upper 70’s,
lower 80’s with cooler temps over hill country.

The persistent ridge of high pressure continues over the region on Saturday, with partly cloudy
skies and no rain with high temps in the upper 90’s, lower 100’s.  Partly cloudy to mostly clear
across south TX overnight Saturday with low temps in the upper 70’s, lower 80’s with cooler
temps over hill country.  Partly cloudy skies are again likely on Sunday, with highs in the upper
90’s, lower 100’s.  Some moisture looks to begin moving from the Gulf into south TX early next
week, with isolated rain possible along the coast Monday and Tuesday.

Daily normal (F): high 96, low 75

Pilots (STWMA): no cloud seeding today.  

Today: Partly cloudy with mostly cloudy skies over hill country in the early morning.  High Heat
Index values likely in the afternoon and evening.  High temps in the upper 90’s, lower 100’s with
slightly cooler temps over hill country.  Southeasterly winds 0 – 10 mph then 5 – 15 mph later
this afternoon.

Tonight: Partly cloudy.  Low temps in the upper 70’s, lower 80’s with cooler temps over hill
country.  Southeasterly winds 5 – 15 mph in the evening then decreasing overnight.

Saturday: Partly cloudy.  Highs in the upper 90’s, lower 100’s.  Mostly clear overnight.  Overnight
low temps in the upper 70’s, lower 80’s with cooler temps over hill country.  Southeasterly winds
5 – 15 mph.

Sunday: Partly cloudy.  High temps in the upper 90’s, lower 100’s.  Mostly clear overnight.  
Overnight lows in the upper 70’s, lower 80’s with cooler temps over hill country.  Southeasterly
winds 5 – 15 mph.

Extended: Partly cloudy with isolated rain possible along the coast both Monday and Tuesday
(August 22).


Forecast Notes:
Temperatures are in Fahrenheit (F)
Wind speeds are in miles per hour (mph)
Rainfall amounts in inches (in.)
Visibility in miles

Rain chance terminology from lowest to highest chance: isolated, scattered, widespread.
South Texas Weather Modification Association