San Marcos, Texas Weather Conditions

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Current Conditions

  • 84°
  • Clear
  • Wind: South 14 mph
  • Humidity: 66%
  • Visibility: 10.0 miles
  • Dew Point: 72°
  • Pressure: 29.98 in. -
  • Heat Index: 90

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Next 12 Hours

11  pm
2  am
5  am
8  am
11  am
Clear
Clear
Clear
Clear
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Clear
Clear
85°
81°
79°
79°
89°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Partly Cloudy
  • High: 101 °
  • Low: 76 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 102 °
  • Low: 75 °
  • Partly Cloudy
  • Friday
  • Clear
  • High: 102 °
  • Low: 75 °
  • Clear
  • Saturday
  • Partly Cloudy
  • High: 103 °
  • Low: 75 °
  • Partly Cloudy
  • Sunday
  • Clear
  • High: 103 °
  • Low: 75 °
  • Clear

Forecast for San Marcos, Texas

Updated: 2:22 PM CDT on August 4, 2015

  • Tonight

    Partly cloudy until early morning then becoming mostly cloudy. Lows in the mid 70s. South winds 10 to 15 mph.

  • Wednesday

    Partly cloudy in the morning then clearing. Highs in the upper 90s. South winds 10 to 15 mph. Highest heat index readings around 107.

  • Wednesday Night

    Partly cloudy. Lows in the mid 70s. South winds 10 to 15 mph.

  • Thursday

    Mostly sunny. Highs in the upper 90s. South winds 10 to 15 mph. Highest heat index readings around 106.

  • Thursday Night

    Mostly clear. Lows in the mid 70s. South winds 10 to 15 mph.

  • Friday through Monday Night

    Mostly clear. Highs around 100. Lows in the mid 70s.

  • Tuesday

    Mostly sunny. Highs around 100.

Severe Weather Alert Descriptions

 Special Statement  Statement as of 10:51 PM CDT on August 4, 2015


... Elevated heat index values for the remainder of this week into
this weekend...

Elevated heat index values will continue through at least
Saturday as high pressure builds back over south central Texas.
Heat index values will approach but remain below heat advisory
criteria of 108 in the coastal plains and 110 in the Rio Grande
plains. Elsewhere... heat index values will be in the 100 to 105
range... except lower in parts of The Hill Country. The highest
threat day for heat advisories is Saturday. The highest threat
area is near the coastal plains. Humidities will decrease Sunday
into early next week bringing lower heat index values.

In addition to high heat index values... direct exposure to
sunlight can also contribute to dehydration and an increased
likelihood of heat related illness. Take extra precautions if you
plan to be outside. When possible... reschedule strenuous afternoon
activities for the early morning or evening hours. Know the signs
and symptoms of heat exhaustion and heat stroke.

If you are outdoors... drink plenty of water... wear light weight
and light colored clothing... and take frequent breaks from the
heat. Never leave a child or pet unattended in a vehicle... as
interiors will reach lethal temperatures in a matter of minutes
after turning off the air conditioning. Beat the heat... check the
back seat!


1051 PM CDT Tue Aug 4 2015

... Elevated heat index values for the remainder of this week into
this weekend...

Elevated heat index values will continue through at least
Saturday as high pressure builds back over south central Texas.
Heat index values will approach but remain below heat advisory
criteria of 108 in the coastal plains and 110 in the Rio Grande
plains. Elsewhere... heat index values will be in the 100 to 105
range... except lower in parts of The Hill Country. The highest
threat day for heat advisories is Saturday. The highest threat
area is near the coastal plains. Humidities will decrease Sunday
into early next week bringing lower heat index values.

In addition to high heat index values... direct exposure to
sunlight can also contribute to dehydration and an increased
likelihood of heat related illness. Take extra precautions if you
plan to be outside. When possible... reschedule strenuous afternoon
activities for the early morning or evening hours. Know the signs
and symptoms of heat exhaustion and heat stroke.

If you are outdoors... drink plenty of water... wear light weight
and light colored clothing... and take frequent breaks from the
heat. Never leave a child or pet unattended in a vehicle... as
interiors will reach lethal temperatures in a matter of minutes
after turning off the air conditioning. Beat the heat... check the
back seat!



248 PM CDT Tue Aug 4 2015

... Elevated heat index values for the remainder of this week into
this weekend...

Increasing humidities combined with afternoon temperatures in the
upper 90s to lower 100s has caused a noticeable increase in heat
index values today. These elevated heat index values will continue
through at least Saturday as high pressure builds back over south
central Texas. Heat index values will approach but remain below
heat advisory criteria of 108 in the coastal plains and 110 in the
Rio Grande plains. Elsewhere... heat index values will be in the
100 to 105 range... except lower in parts of The Hill Country. The
highest threat day for heat advisories is Saturday. The highest
threat area is near the coastal plains. Humidities will decrease
Sunday into early next week bringing lower heat index values.

In addition to high heat index values... direct exposure to
sunlight can also contribute to dehydration and an increased
likelihood of heat related illness. Take extra precautions if you
plan to be outside. When possible... reschedule strenuous afternoon
activities for the early morning or evening hours. Know the signs
and symptoms of heat exhaustion and heat stroke.

If you are outdoors... drink plenty of water... wear light weight
and light colored clothing... and take frequent breaks from the
heat. Never leave a child or pet unattended in a vehicle... as
interiors will reach lethal temperatures in a matter of minutes
after turning off the air conditioning. Beat the heat... check the
back seat!


248 PM CDT Tue Aug 4 2015

... Elevated heat index values for the remainder of this week into
this weekend...

Increasing humidities combined with afternoon temperatures in the
upper 90s to lower 100s has caused a noticeable increase in heat
index values today. These elevated heat index values will continue
through at least Saturday as high pressure builds back over south
central Texas. Heat index values will approach but remain below
heat advisory criteria of 108 in the coastal plains and 110 in the
Rio Grande plains. Elsewhere... heat index values will be in the
100 to 105 range... except lower in parts of The Hill Country. The
highest threat day for heat advisories is Saturday. The highest
threat area is near the coastal plains. Humidities will decrease
Sunday into early next week bringing lower heat index values.

In addition to high heat index values... direct exposure to
sunlight can also contribute to dehydration and an increased
likelihood of heat related illness. Take extra precautions if you
plan to be outside. When possible... reschedule strenuous afternoon
activities for the early morning or evening hours. Know the signs
and symptoms of heat exhaustion and heat stroke.

If you are outdoors... drink plenty of water... wear light weight
and light colored clothing... and take frequent breaks from the
heat. Never leave a child or pet unattended in a vehicle... as
interiors will reach lethal temperatures in a matter of minutes
after turning off the air conditioning. Beat the heat... check the
back seat!




Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Heritage, San Marcos, TX

Updated: 11:15 PM CDT

Temperature: 88.3 °F Dew Point: 71 °F Humidity: 56% Wind: North at - Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

Location: Spring Lake Hills, San Marcos, TX

Updated: 11:17 PM CDT

Temperature: 83.1 °F Dew Point: 71 °F Humidity: 67% Wind: SSW at 1.3 mph Pressure: 30.16 in Hourly Precipitation: 0.00 in Heat Index: 88 °F Graphs

Location: Willow Creek, San Marcos, TX

Updated: 11:17 PM CDT

Temperature: 84.4 °F Dew Point: 74 °F Humidity: 70% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Siesta Verde, San Marcos, TX

Updated: 11:17 PM CDT

Temperature: 83.2 °F Dew Point: 72 °F Humidity: 70% Wind: SSW at 3.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Hay Barn Drive, Kyle, TX

Updated: 11:15 PM CDT

Temperature: 86.7 °F Dew Point: 71 °F Humidity: 59% Wind: North at - Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Hunter Ridge, San Marcos, TX

Updated: 11:17 PM CDT

Temperature: 83.2 °F Dew Point: 74 °F Humidity: 74% Wind: SSW at 3.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Quail Run, Martindale, TX

Updated: 11:17 PM CDT

Temperature: 83.5 °F Dew Point: 69 °F Humidity: 62% Wind: SE at 6.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Oak Meadows, San Marcos, TX

Updated: 11:17 PM CDT

Temperature: 83.1 °F Dew Point: 70 °F Humidity: 64% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Cypress Road, Kyle, TX

Updated: 11:17 PM CDT

Temperature: 84.2 °F Dew Point: 74 °F Humidity: 72% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Kyle, Kyle, TX

Updated: 11:17 PM CDT

Temperature: 84.5 °F Dew Point: 72 °F Humidity: 67% Wind: South at 7.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Goodger Farm, Martindale, TX

Updated: 11:17 PM CDT

Temperature: 83.7 °F Dew Point: 77 °F Humidity: 80% Wind: South at 2.9 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 93 °F Graphs

Location: Silverado, Kyle, TX

Updated: 11:12 PM CDT

Temperature: 84.6 °F Dew Point: 60 °F Humidity: 44% Wind: SSW at 3.7 mph Pressure: 29.80 in Hourly Precipitation: - Heat Index: 85 °F Graphs

Location: Downtown, Staples, TX

Updated: 11:17 PM CDT

Temperature: 83.3 °F Dew Point: 74 °F Humidity: 73% Wind: South at 10.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Windy Hill, Kyle, TX

Updated: 11:14 PM CDT

Temperature: 83.1 °F Dew Point: 72 °F Humidity: 70% Wind: ESE at 2.2 mph Pressure: 29.88 in Hourly Precipitation: - Heat Index: 89 °F Graphs

Location: River Mountain Ranch, Wimberley, TX

Updated: 11:17 PM CDT

Temperature: 83.1 °F Dew Point: 51 °F Humidity: 33% Wind: SSW at 2.5 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 82 °F Graphs

Location: Elk Ridge Rockpile, Canyon Lake, TX

Updated: 11:14 PM CDT

Temperature: 82.6 °F Dew Point: 72 °F Humidity: 71% Wind: South at 6.3 mph Pressure: 29.70 in Hourly Precipitation: - Heat Index: 88 °F Graphs

Location: Havenwood, New Braunfels, TX

Updated: 11:14 PM CDT

Temperature: 84.6 °F Dew Point: 74 °F Humidity: 70% Wind: South at 1.0 mph Pressure: 29.73 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: paradise hills, Wimberley, TX

Updated: 11:17 PM CDT

Temperature: 83.3 °F Dew Point: 72 °F Humidity: 70% Wind: South at 2.5 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: MesoWest, New Braunfels, TX

Updated: 7:25 PM CDT

Temperature: 94 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Hilltop Ridge - The Summit, New Braunfels, TX

Updated: 11:06 PM CDT

Temperature: 83.9 °F Dew Point: 73 °F Humidity: 69% Wind: SE at 2.0 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Eden Ranch Drive, New Braunfels, TX

Updated: 11:15 PM CDT

Temperature: 84.7 °F Dew Point: 72 °F Humidity: 64% Wind: North at - Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Corner of River Road and Lange Road, Wimberley, TX

Updated: 11:17 PM CDT

Temperature: 85.6 °F Dew Point: 72 °F Humidity: 65% Wind: SSE at 1.8 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Creekside Drive, Buda, TX

Updated: 11:15 PM CDT

Temperature: 85.3 °F Dew Point: 72 °F Humidity: 63% Wind: North at - Pressure: 29.78 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Sierra West Sect 4, Driftwood, TX

Updated: 11:02 PM CDT

Temperature: 84.2 °F Dew Point: 70 °F Humidity: 63% Wind: SSW at 4.2 mph Pressure: 29.82 in Hourly Precipitation: - Heat Index: 89 °F Graphs

Location: River Chase, New Braunfels, TX

Updated: 11:04 PM CDT

Temperature: 84.2 °F Dew Point: 65 °F Humidity: 53% Wind: SE at 2.2 mph Pressure: 29.73 in Hourly Precipitation: - Heat Index: 86 °F Graphs

Location: APRSWXNET, Canyon Lake, TX

Updated: 10:56 PM CDT

Temperature: 85 °F Dew Point: 71 °F Humidity: 63% Wind: South at 1 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Ranch at Wimberley, Wimberley, TX

Updated: 11:14 PM CDT

Temperature: 82.8 °F Dew Point: 70 °F Humidity: 65% Wind: South at 4.2 mph Pressure: 29.89 in Hourly Precipitation: - Heat Index: 87 °F Graphs

Location: Guadalupe River at Riverside Path, Canyon Lake, TX

Updated: 11:17 PM CDT

Temperature: 83.1 °F Dew Point: 57 °F Humidity: 41% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: 83 °F Graphs

Location: Skyline Ranch, Wimberley, TX

Updated: 11:17 PM CDT

Temperature: 84.0 °F Dew Point: 71 °F Humidity: 65% Wind: SSE at 3.1 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Gruene Crossing, New Braunfels, TX

Updated: 11:17 PM CDT

Temperature: 82.8 °F Dew Point: 49 °F Humidity: 31% Wind: ESE at 3.6 mph Pressure: 29.65 in Hourly Precipitation: 0.00 in Heat Index: 81 °F Graphs

Location: Gruene Leaf Drive, New Braunfels, TX

Updated: 11:15 PM CDT

Temperature: 85.5 °F Dew Point: 73 °F Humidity: 66% Wind: North at - Pressure: 29.86 in Hourly Precipitation: - Heat Index: 92 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Austin/San Antonio Texas 
645 PM CDT Tuesday Aug 4 2015 


Aviation... 
few/scattered clouds are persisting at all taf sites at the present hour 
and this will continue until around 8-9z for the I-35 taf sites as 
another round of morning MVFR stratus is expected. VFR will 
return by 15z. Otherwise...southerly flow around 10-15 knots will 
continue through the period. 


&& 


Previous discussion... /issued 222 PM CDT Tuesday Aug 4 2015/ 


Short term (tonight through Wednesday night)... 
deeper moisture has returned to south central Texas with precipitable waters  of 1.6 
to 2 inches. Some showers and thunderstorms are possible across 
areas near the coastal plains this afternoon. The deeper moisture 
lingers into Wednesday with the subtropical ridge remaining over 
the southwestern states. Dewpoints will not easily mix out keeping 
heat index values elevated on Wednesday with values approaching 
heat advisory levels of 108 near the coastal plains. Cannot rule 
out one or two showers near the coastal plains Wednesday afternoon 
along the seabreeze. 


Long term (thursday through tuesday)... 
the subtropical ridge becomes centered over the Southern Plains on 
Thursday and remains there through Tuesday. Temperatures will rise 
a degree or two as boundary layer warms and thicknesses increase. 
A moderate onshore flow maintains a supply of lower level moisture 
causing heat index values to rise. Heat advisory criteria will be 
approached and could be briefly reached in the afternoon near the 
coastal plains with Saturday being the highest threat day. Will 
continue mention in hazardous weather outlook and special weather 
statements. Onshore flow weakens next week allowing lower level 
moisture to decrease lowering the heat index. Strong subsidence 
and middle to upper level drying leading to below normal moisture 
levels with precipitable waters  of 1 to 1.6 inches shall keep rain out of the 
forecast. 


Just beyond this forecast for the middle of next week...some 
models are showing the ridge drifting to the west and allowing a 
surface boundary to move close to south central Texas along with 
an increase of moisture leading to showers and thunderstorms. 


&& 


Preliminary point temps/pops... 
Austin Camp Mabry 77 99 78 100 77 / 0 0 0 0 0 
Austin Bergstrom international Airport 74 98 76 100 74 / 0 0 0 0 0 
New Braunfels Muni Airport 76 100 76 101 75 / 0 0 0 0 0 
Burnet Muni Airport 75 99 76 100 75 / 0 0 0 0 0 
del Rio International Airport 78 101 79 102 78 / 0 0 0 0 0 
Georgetown Muni Airport 77 99 77 101 76 / 0 0 0 0 0 
Hondo Muni Airport 76 98 76 100 74 / 0 0 0 0 0 
San Marcos Muni Airport 76 99 76 100 76 / 0 0 0 0 0 
La Grange - Fayette regional 77 99 77 99 77 / 0 0 0 0 0 
San Antonio International Airport 79 99 78 100 78 / 0 0 0 0 0 
Stinson Muni Airport 77 99 77 100 77 / 0 0 0 0 0 


&& 


Ewx watches/warnings/advisories... 
none. 
&& 


$$ 


Mesoscale/aviation...05 
synoptic/grids...Hampshire 






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