San Marcos, Texas Weather Conditions

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Current Conditions

  • 79°
  • Clear
  • Wind: North -9999 mph
  • Humidity: 61%
  • Visibility: 10.0 miles
  • Dew Point: 64°
  • Pressure: 29.91 in. 0

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Next 12 Hours

10  am
1  pm
4  pm
7  pm
10  pm
Clear
Clear
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Clear
Clear
Clear
Clear
79°
88°
91°
84°
77°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Partly Cloudy
  • High: 91 °
  • Low: 70 °
  • Partly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 91 °
  • Low: 72 °
  • Partly Cloudy
  • Thursday
  • Chance of a Thunderstorm
  • High: 91 °
  • Low: 68 °
  • Chance of a Thunderstorm
  • Friday
  • Clear
  • High: 86 °
  • Low: 55 °
  • Clear
  • Saturday
  • Partly Cloudy
  • High: 79 °
  • Low: 57 °
  • Partly Cloudy

Forecast for San Marcos, Texas

Updated: 10:00 AM CDT on September 30, 2014

  • Tuesday

    Partly cloudy. High of 91F. Winds less than 5 mph.

  • Tuesday Night

    Clear in the evening, then partly cloudy. Low of 70F. Winds from the SSE at 5 to 10 mph.

  • Wednesday

    Partly cloudy. Fog early. High of 91F. Winds from the South at 5 to 10 mph.

  • Wednesday Night

    Clear in the evening, then mostly cloudy. Low of 72F. Winds from the South at 5 to 15 mph.

  • Thursday

    Partly cloudy with a chance of rain, then a chance of a thunderstorm and a chance of rain in the afternoon. High of 91F with a heat index of 97F. Winds from the South at 10 to 15 mph. Chance of rain 20%.

  • Thursday Night

    Partly cloudy with a chance of a thunderstorm and rain. Low of 68F. Winds from the South at 5 to 10 mph shifting to the NNW after midnight. Chance of rain 60% with rainfall amounts near 0.2 in. possible.

  • Friday

    Clear. High of 86F. Winds from the North at 10 to 15 mph.

  • Friday Night

    Clear. Low of 55F. Winds from the NNE at 5 to 10 mph.

  • Saturday

    Clear. High of 79F. Winds less than 5 mph.

  • Saturday Night

    Partly cloudy. Fog overnight. Low of 57F. Winds from the South at 5 to 10 mph.

  • Sunday

    Clear. High of 84F. Winds from the South at 10 to 15 mph.

  • Sunday Night

    Partly cloudy. Fog overnight. Low of 61F. Winds from the South at 5 to 10 mph.

  • Monday

    Clear. High of 84F. Winds from the SSE at 5 to 10 mph.

  • Monday Night

    Clear. Fog overnight. Low of 64F. Winds from the SSE at 5 to 10 mph.

  • Tuesday

    Partly cloudy with a chance of a thunderstorm. High of 88F. Winds from the South at 5 to 15 mph. Chance of rain 20%.

  • Tuesday Night

    Partly cloudy. Fog overnight. Low of 72F. Winds from the SSE at 5 to 10 mph.

  • Wednesday

    Partly cloudy with a chance of a thunderstorm. High of 84F. Winds less than 5 mph. Chance of rain 40%.

  • Wednesday Night

    Mostly cloudy. Fog overnight. Low of 68F. Winds less than 5 mph.

  • Thursday

    Partly cloudy with a chance of a thunderstorm. High of 82F. Winds less than 5 mph. Chance of rain 40%.

  • Thursday Night

    Partly cloudy. Fog overnight. Low of 66F. Winds less than 5 mph.

  • Friday

    Partly cloudy with a chance of a thunderstorm. High of 82F. Winds less than 5 mph. Chance of rain 40%.

  • Friday Night

    Clear. Fog overnight. Low of 66F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Spring Lake Hills, San Marcos, TX

Updated: 10:49 AM CDT

Temperature: 86.9 °F Dew Point: 73 °F Humidity: 63% Wind: Calm Pressure: 30.10 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

Location: Lime Kiln, San Marcos, TX

Updated: 10:49 AM CDT

Temperature: 81.8 °F Dew Point: 71 °F Humidity: 70% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Hunter Ridge, San Marcos, TX

Updated: 10:49 AM CDT

Temperature: 83.1 °F Dew Point: 73 °F Humidity: 71% Wind: ESE at 1.0 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Oak Meadows, San Marcos, TX

Updated: 10:49 AM CDT

Temperature: 81.3 °F Dew Point: 68 °F Humidity: 64% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Goodger Farm, Martindale, TX

Updated: 10:49 AM CDT

Temperature: 82.4 °F Dew Point: 72 °F Humidity: 72% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: 88 °F Graphs

Location: Silverado, Kyle, TX

Updated: 10:38 AM CDT

Temperature: 81.5 °F Dew Point: 58 °F Humidity: 45% Wind: ENE at 3.2 mph Pressure: 29.75 in Hourly Precipitation: - Heat Index: 82 °F Graphs

Location: Downtown, Staples, TX

Updated: 10:49 AM CDT

Temperature: 84.2 °F Dew Point: 71 °F Humidity: 64% Wind: SSW at 2.8 mph Pressure: 29.90 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: River Mountain Ranch, Wimberley, TX

Updated: 10:49 AM CDT

Temperature: 81.9 °F Dew Point: 69 °F Humidity: 65% Wind: ESE at 1.8 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: Havenwood, New Braunfels, TX

Updated: 10:49 AM CDT

Temperature: 80.4 °F Dew Point: 72 °F Humidity: 77% Wind: Calm Pressure: 29.68 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: ParkPlace4RV's, Canyon Lake, TX

Updated: 10:48 AM CDT

Temperature: 80.1 °F Dew Point: 71 °F Humidity: 73% Wind: ESE at 2.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 83 °F Graphs

Location: Un Encino Rancho - Box Canyon, Wimberley, TX

Updated: 10:42 AM CDT

Temperature: 80.2 °F Dew Point: 70 °F Humidity: 72% Wind: Calm Pressure: 29.74 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

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

Updated: 10:49 AM CDT

Temperature: 81.4 °F Dew Point: 72 °F Humidity: 72% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: River Road/Lange Road, Wimberley, TX

Updated: 10:43 AM CDT

Temperature: 84.4 °F Dew Point: 83 °F Humidity: 95% Wind: SSW at 3.2 mph Pressure: 29.80 in Hourly Precipitation: - Heat Index: 102 °F Graphs

Location: River Chase, New Braunfels, TX

Updated: 10:39 AM CDT

Temperature: 80.1 °F Dew Point: 70 °F Humidity: 72% Wind: South at 1.6 mph Pressure: 29.68 in Hourly Precipitation: - Heat Index: 83 °F Graphs

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

Updated: 10:49 AM CDT

Temperature: 78.4 °F Dew Point: 71 °F Humidity: 77% Wind: Calm Pressure: 29.78 in Hourly Precipitation: 0.00 in Heat Index: 81 °F Graphs

Location: Gruene Crossing, New Braunfels, TX

Updated: 10:49 AM CDT

Temperature: 79.9 °F Dew Point: 51 °F Humidity: 37% Wind: Calm Pressure: 29.59 in Hourly Precipitation: 0.00 in Heat Index: 80 °F Graphs

Location: Preiss Heights, New Braunfels, TX

Updated: 10:49 AM CDT

Temperature: 77.2 °F Dew Point: 71 °F Humidity: 82% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 79 °F Graphs

Location: Flying Horses Ranch, Buda, TX

Updated: 10:49 AM CDT

Temperature: 82.0 °F Dew Point: 70 °F Humidity: 67% Wind: South at 2.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Canyon Falls RV Park, Canyon Lake, TX

Updated: 10:49 AM CDT

Temperature: 80.2 °F Dew Point: 71 °F Humidity: 74% Wind: SSE at 1.1 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Garlic Creek West, Buda, TX

Updated: 10:36 AM CDT

Temperature: 84.3 °F Dew Point: 72 °F Humidity: 66% Wind: Calm Pressure: 29.83 in Hourly Precipitation: - Heat Index: 90 °F Graphs

Location: Oakwood Estates, New Braunfels, TX

Updated: 10:49 AM CDT

Temperature: 82.7 °F Dew Point: 73 °F Humidity: 72% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 88 °F Graphs

Location: LCYC, Canyon Lake, TX

Updated: 10:49 AM CDT

Temperature: 76.2 °F Dew Point: 70 °F Humidity: 81% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Turnersville, Buda, TX

Updated: 10:49 AM CDT

Temperature: 79.7 °F Dew Point: 62 °F Humidity: 54% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 81 °F Graphs

Location: La Ventana, Driftwood, TX

Updated: 10:40 AM CDT

Temperature: 79.5 °F Dew Point: 69 °F Humidity: 71% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 82 °F Graphs

Location: Blanco River Estates, Wimberley, TX

Updated: 10:49 AM CDT

Temperature: 80.5 °F Dew Point: 70 °F Humidity: 71% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: MesoWest NEWBRA TX US UPR, New Braunfels, TX

Updated: 9:55 AM CDT

Temperature: 80 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Turkey Cove, Canyon Lake, TX

Updated: 10:49 AM CDT

Temperature: 77.1 °F Dew Point: 70 °F Humidity: 79% Wind: NNW at 1.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 79 °F Graphs

Location: Lake Dunlap, New Braunfels, TX

Updated: 10:49 AM CDT

Temperature: 76.9 °F Dew Point: 72 °F Humidity: 84% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion...updated 
National Weather Service Austin/San Antonio Texas 
935 am CDT Tuesday Sep 30 2014 


Update... 
this is a quick update to remove the mentioning of patchy fog 
across our southeast counties. Expect mostly sunny skies across 
most areas with scattered clouds lingering across the southeast. 
There is a slight chance of showers/storms across the southeast 
mainly east of a Giddings to Gonzales to Kenedy line this afternoon. 
Some upper sheared moisture from Tropical Storm Rachel over the 
eastern Pacific will move across the Rio Grande/Edwards Plateau 
from time to time. Updated zones out shortly. 


&& 


Previous discussion... /issued 715 am CDT Tuesday Sep 30 2014/ 


Update... 
please see the 12z aviation discussion below. 


Aviation... 
patchy low clouds are developing along the I-35 corridor according 
to the latest 11-3.9 satellite loop and surface observations. 
Stratus clouds will not be widespread...but based on current 
trends will include a mention of tempo MVFR ceilings at ksat through 
14z. Otherwise...VFR conditions are expected today as winds become 
southeasterly. An increase in moisture will lead to patchy fog and 
widespread stratus development early Wednesday morning. We/ll 
continue to mention MVFR conditions and based on the latest NAM 
soundings... we could even see some IFR ceilings. For now...we/ll keep 
MVFR in the forecast and await later model data before dropping 
ceilings into IFR. 


Previous discussion... /issued 352 am CDT Tuesday Sep 30 2014/ 


Short term (today through wednesday)... 
mostly stable zonal flow aloft pattern will continue the slight 
warming trend for today. Over eastern counties...a weak middle-level 
trough will allow for slightly deeper moisture depth and a chance 
for isolated air mass type convection over the coastal prairies. 
Min temperatures for tonight will continue warming as well...as an upstream 
troughing over The Rockies will increase low level southerlies and 
moisture. Some morning clouds should give way to partly to mostly 
sunny afternoon with highs similar to those of today. 


Long term (wednesday night through monday)... 
the trough digging to the west will further deepen moisture over 
south central Texas early Thursday with a humid and warm day 
expected. Models continue to show the base of the trough tracking 
north of south central Texas late Thursday...leaving most of the 
dynamic lift to the north. Some light directional shear and 
moisture pooling from an approaching front should allow for an 
isolated thunderstorm chance over mainly northern counties 
Thursday afternoon and evening. The front is expected to increase 
rain chances as it moves southward into deeper moisture overnight 
into Friday morning. Most of the synoptic scale models show modest 
amounts of quantitative precipitation forecast...and the wetter Canadian model is also trending 
drier than earlier runs. The NAM looks to be an outlier with a 
slower front and higher amounts of convective potential. 


Post frontal conditions are expected to come with significant 
drying to allow for much cooler min temperatures for the weekend and 
even some below normal highs in the daytime. The western US ridging 
pattern aloft that allows for the dry northwest flow aloft pattern over Texas 
this weekend begins to flatten early next week. Southerly wind 
return in this model cycle is more aggressive for early next 
week...so a return to warm humid conditions is expected by the 
middle of next week. 


&& 


Preliminary point temps/pops... 
Austin Camp Mabry 92 72 91 75 91 / - - - 10 20 
Austin Bergstrom international Airport 91 69 92 72 92 / - - - 10 20 
New Braunfels Muni Airport 93 70 93 73 93 / - - - 10 20 
Burnet Muni Airport 90 69 90 73 91 / - - - 10 20 
del Rio International Airport 89 70 91 74 91 / - 0 - 10 20 
Georgetown Muni Airport 91 71 91 74 91 / - - - 10 20 
Hondo Muni Airport 93 70 93 73 94 / - 0 - 10 10 
San Marcos Muni Airport 91 70 91 73 92 / - - - 10 20 
La Grange - Fayette regional 91 72 91 75 92 / 20 10 10 10 20 
San Antonio International Airport 92 72 92 76 93 / - - - 10 10 
Stinson Muni Airport 93 72 93 75 94 / - - - 10 10 


&& 


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


$$ 


Mesoscale/aviation...09 
synoptic/grids...17 
public service/data collection...33 










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