Katy, Texas Weather Conditions

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Current Conditions

  • 81°
  • Mostly Cloudy
  • Wind: ENE 4 mph
  • Humidity: 100%
  • Visibility: 10.0 miles
  • Dew Point: 81°
  • Pressure: 29.90 in. -
  • Heat Index: 89

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Next 12 Hours

10  am
1  pm
4  pm
7  pm
10  pm
Partly Cloudy
Partly Cloudy
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Partly Cloudy
Partly Cloudy
Clear
Clear
77°
82°
84°
79°
79°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Chance of a Thunderstorm
  • High: 88 °
  • Low: 72 °
  • Chance of a Thunderstorm
  • Wednesday
  • Partly Cloudy
  • High: 88 °
  • Low: 72 °
  • Partly Cloudy
  • Thursday
  • Thunderstorm
  • High: 90 °
  • Low: 72 °
  • T-Storms
  • Friday
  • Chance of Rain
  • High: 81 °
  • Low: 59 °
  • Chance of Rain
  • Saturday
  • Partly Cloudy
  • High: 79 °
  • Low: 57 °
  • Partly Cloudy

Forecast for Katy, Texas

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

  • Tuesday

    Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. High of 88F. Winds less than 5 mph. Chance of rain 20%.

  • Tuesday Night

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

  • Wednesday

    Partly cloudy. Fog early. High of 88F. Winds from the SSE at 5 to 10 mph.

  • Wednesday Night

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

  • Thursday

    Mostly cloudy with a chance of a thunderstorm and a chance of rain. High of 90F with a heat index of 95F. Winds from the South at 5 to 15 mph. Chance of rain 30%.

  • Thursday Night

    Mostly cloudy with thunderstorms and rain showers, then a chance of a thunderstorm and rain after midnight. Fog overnight. Low of 72F. Winds from the SSW at 5 to 15 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Friday

    Overcast with a chance of rain in the morning, then clear. High of 81F. Winds from the North at 10 to 15 mph. Chance of rain 20%.

  • Friday Night

    Clear. Low of 59F. Winds from the NNE at 5 to 10 mph.

  • Saturday

    Partly cloudy. High of 79F. Winds less than 5 mph.

  • Saturday Night

    Clear. Fog overnight. Low of 57F. Winds from the SSE at 5 to 10 mph.

  • Sunday

    Partly cloudy with a chance of a thunderstorm. High of 81F. Winds from the South at 5 to 15 mph. Chance of rain 20%.

  • Sunday Night

    Partly cloudy. Fog overnight. Low of 63F. Winds from the SSE at 5 to 10 mph.

  • Monday

    Partly cloudy with a chance of a thunderstorm. Fog early. High of 84F with a heat index of 90F. Winds from the South at 5 to 10 mph. Chance of rain 50%.

  • Monday Night

    Clear. Fog overnight. Low of 70F. Winds from the SSE at 5 to 10 mph.

  • Tuesday

    Partly cloudy with a chance of a thunderstorm. High of 86F. Winds from the SSE at 5 to 15 mph. Chance of rain 50%.

  • Tuesday Night

    Partly cloudy. Fog overnight. Low of 73F. Winds from the SE 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

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

  • Thursday

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

  • Thursday Night

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

  • Friday

    Clear 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 68F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Waterstone, Katy, TX

Updated: 10:40 AM CDT

Temperature: 83.5 °F Dew Point: 77 °F Humidity: 80% Wind: Calm Pressure: 29.56 in Hourly Precipitation: - Heat Index: 93 °F Graphs

Location: Waterstone - West, Katy, TX

Updated: 10:49 AM CDT

Temperature: 84.2 °F Dew Point: 72 °F Humidity: 68% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Westlake Forest, Houston, TX

Updated: 10:39 AM CDT

Temperature: 84.9 °F Dew Point: 74 °F Humidity: 69% Wind: SSW at 2.7 mph Pressure: 29.69 in Hourly Precipitation: - Heat Index: 92 °F Graphs

Location: Deerfield Village, Houston, TX

Updated: 10:44 AM CDT

Temperature: 82.6 °F Dew Point: 75 °F Humidity: 78% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: Nottingham Country, Katy, TX

Updated: 10:49 AM CDT

Temperature: 86.9 °F Dew Point: 78 °F Humidity: 75% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Cimarron, Katy, TX

Updated: 10:38 AM CDT

Temperature: 85.0 °F Dew Point: 74 °F Humidity: 69% Wind: NE at 2.7 mph Pressure: 29.78 in Hourly Precipitation: - Heat Index: 92 °F Graphs

Location: Westminster Landing, Houston, TX

Updated: 10:40 AM CDT

Temperature: 83.4 °F Dew Point: 75 °F Humidity: 77% Wind: ESE at 1.0 mph Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Windsor Park Estates, Houston, TX

Updated: 10:47 AM CDT

Temperature: 83.0 °F Dew Point: 78 °F Humidity: 84% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 93 °F Graphs

Location: Nottingham Country Section 8, Katy, TX

Updated: 10:50 AM CDT

Temperature: 87.2 °F Dew Point: 75 °F Humidity: 68% Wind: South at 2.0 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 97 °F Graphs

Location: Canyon Lakes West, Cypress, TX

Updated: 10:50 AM CDT

Temperature: 83.7 °F Dew Point: 76 °F Humidity: 78% Wind: NNE at 2.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Kelliwood, Katy, TX

Updated: 10:50 AM CDT

Temperature: 87.4 °F Dew Point: 77 °F Humidity: 72% Wind: North at - Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Creekstone, Katy, TX

Updated: 10:50 AM CDT

Temperature: 82.4 °F Dew Point: 66 °F Humidity: 57% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Sommerall, Houston, TX

Updated: 10:48 AM CDT

Temperature: 84.1 °F Dew Point: 75 °F Humidity: 75% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Cinco Ranch Meadow Green, Katy, TX

Updated: 10:45 AM CDT

Temperature: 83.9 °F Dew Point: 76 °F Humidity: 76% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Heritage Towne Lake, Cypress, TX

Updated: 10:49 AM CDT

Temperature: 83.5 °F Dew Point: 75 °F Humidity: 76% Wind: NNE at 3.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Southcreek, Copperfield, Houston, TX

Updated: 10:45 AM CDT

Temperature: 84.7 °F Dew Point: 77 °F Humidity: 77% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 95 °F Graphs

Location: Copperfield - Copper Lakes - ManorSide, Houston, TX

Updated: 10:50 AM CDT

Temperature: 83.4 °F Dew Point: 75 °F Humidity: 77% Wind: ENE at 1.0 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 91 °F Graphs

Location: Copperfield - Copper Lakes - Waterford, Houston, TX

Updated: 10:50 AM CDT

Temperature: 83.5 °F Dew Point: 77 °F Humidity: 81% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 93 °F Graphs

Location: Cinco Ranch Equestrian Village, Katy, TX

Updated: 10:48 AM CDT

Temperature: 88.9 °F Dew Point: 77 °F Humidity: 68% Wind: West at 2.2 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 102 °F Graphs

Location: Copper Village, Houston, TX

Updated: 10:50 AM CDT

Temperature: 83.5 °F Dew Point: 76 °F Humidity: 78% Wind: Calm Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 92 °F Graphs

Location: Falcon Ranch, Katy, TX

Updated: 10:50 AM CDT

Temperature: 82.4 °F Dew Point: 74 °F Humidity: 76% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Cinco Ranch, Katy, TX

Updated: 10:36 AM CDT

Temperature: 86.4 °F Dew Point: 78 °F Humidity: 76% Wind: NW at 3.8 mph Pressure: 29.83 in Hourly Precipitation: - Heat Index: 99 °F Graphs

Location: Cinco Forest, Katy, TX

Updated: 10:50 AM CDT

Temperature: 81.6 °F Dew Point: 77 °F Humidity: 85% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Arbor At Willow Fork, Katy, TX

Updated: 10:46 AM CDT

Temperature: 82.1 °F Dew Point: 76 °F Humidity: 81% Wind: Calm Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: American Shooting Centers, Houston, TX

Updated: 10:41 AM CDT

Temperature: 82.4 °F Dew Point: 75 °F Humidity: 79% Wind: North at 1.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Houston/Galveston Texas 
1017 am CDT Tuesday Sep 30 2014 




Discussion... 
warm front just off the coast and moving north toward Matagorda 
Bay. The warm front should lift north into the central County Warning Area by late 
afternoon and become diffuse. With heating this afternoon slow 
moving rain showers/thunderstorms and rain should develop across the southern half of the 
region. May see isolated thunderstorms linger into the early 
evening hours to the west of the Houston metroplex in the vicinity 
of the front/seabreeze. Do expect to see patchy/areas of fog in 
the morning...not sure it will be dense but can't rule it out yet 
given the setup with a favorable radiation profile...calm 
winds...and saturated. So have added fog to the grids/forecast for 
tomorrow morning. 
45 


&& 




Previous discussion... /issued 656 am CDT Tuesday Sep 30 2014/ 


Discussion... 
12z taf discussion in aviation section... 


Aviation... 
main concern to start the taf will be visibility at klbx/ksgr/kcxo as 
each of these terminals have seen lower visibility. Fog should be short 
lived and should have VFR ceilings today into tonight. Some of the 
WRF/hrrr models have weak rain showers developing but really have low 
confidence as deep moisture is limited and ridging aloft. 


Other question will be if MVFR ceilings develop tomorrow morning. 
Moisture return off the Gulf should set up with 20-25kt low level jet. Model 
moisture fields and model soundings support MVFR ceilings but may be 
overdone a bit. Have time to nail down these details with future 
tafs so just indicated scattered cloud decks for a few terminals. Did 
indicate MVFR at kcll/kuts/kcxo where stratus may be more favored. 


39 


Previous discussion... /issued 408 am CDT Tuesday Sep 30 2014/ 


Discussion... 
weak high pressure aloft will give way to an approaching upper 
level trough on Thursday and early Friday. The GFS and European model (ecmwf) 
differ a bit on its strength but are close in timing. Both models 
push an associated cold front through southeast Texas Thursday night and 
off the coast Friday morning after sunrise. 


The main challenges for today through Thursday will be daytime 
temperatures. Guidance suggests highs each day will reach either 
to around 90 or into the lower 90s over the inland areas. Right 
now the warmest day looks to be Thursday. Moisture and warm air 
advection plus seabreeze activity may lead to isolated convection 
each day. 


Over the past couple of days...both the GFS and European model (ecmwf) have 
consistently brought the front off the coast around 7 am on 
Friday. The 00z runs continued this timing. The quantitative precipitation forecast fields for 
both models provide good coverage Thursday night and early Friday 
morning ahead of the front. For now do not think there will much 
of a chance for severe storms as the best dynamics and instability 
will be to the north. However...cannot rule out an isolated strong 
storm and will mention the possibility in the hazardous weather 
outlook. 


Clearing conditions will follow the front on Friday. High pressure 
then builds overhead for most of the weekend with onshore winds 
returning by late Sunday. Daytime temperatures behind the front 
look to be quite pleasant with highs reaching only in the lower to 
middle 80s on Friday and Saturday. The return flow on Sunday and 
Monday will lead to a warming trend with increasing humidity. 


40 


Marine... 
light easterly winds should become more southerly tonight into 
Wednesday with low seas. Southerly winds increase Wednesday night into 
Thursday as a cold front approaches the area. The stronger southerly 
winds may build seas slightly into Friday. The cold front should push 
off the coast during the day Friday and shift winds to the 
north/northeast. NE winds increase Friday night into Sat with 
building seas. Caution flags will likely be needed for conditions 
behind the front. Advisories cannot be ruled out but latest 
forecasts have winds below advisory criteria. Winds should 
decrease late Saturday and turn back to the southeast on Sunday. 


39 


&& 


Preliminary point temps/pops... 
College Station (cll) 90 72 92 76 92 / 10 10 10 10 30 
Houston (iah) 90 73 90 77 91 / 20 10 20 10 30 
Galveston (gls) 85 78 84 79 87 / 20 10 20 10 20 


&& 


Hgx watches/warnings/advisories... 
Texas...none. 
GM...none. 
&& 


$$ 


Discussion...45 
aviation/marine...38 






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