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Weather Tomorrow

Katy weather forecast

Texas, United States · Chicago time · 29.79°, -95.82°

Current conditions · 8:30 AM local

Current conditions in Katy

77°F

Overcast

Feels like 81°F

Humidity
94%
Wind
6 mph SSE
Gusts
12 mph
UV index
0
Visibility
8 mi

Right now

Katy is currently seeing overcast, with 25 °C on the thermometer. It feels warmer than it reads, more like 29 °C. Wind is from the SSE at 9 km/h. Humidity stands at 94% with sea-level pressure near 1012 hPa.

At a glance

Today

86° / 73°

Thunderstorm · rain likely (72%)

Tomorrow

88° / 79°

Thunderstorm · extreme UV

Upcoming · to Saturday

92° / 73°

A steady stretch: highs near 92°, lows around 73°, and no day above a 2% rain chance through Saturday.

Next 3 days

Today brings thunderstorm with a high of 30 °C and a low of 23 °C. Rain chance peaks at 72% with around 0.5 mm possible. Gusts may reach 50 km/h from the S. Tomorrow looks like thunderstorm; temperatures run from 26 °C up to 31 °C. Gusts may reach 46 km/h from the S. Expect thunderstorm Tuesday, between 24 °C and 33 °C.

Today

Sun, Jun 21

Thunderstorm

86°73°

Rain chance
72%
Precip
0 in
Max wind
14 mph

Tomorrow

Mon, Jun 22

Thunderstorm

88°79°

Rain chance
1%
Precip
0 in
Max wind
13 mph

Tuesday

Tue, Jun 23

Thunderstorm

92°76°

Rain chance
2%
Precip
0 in
Max wind
11 mph

Next 48 hours

  1. 12 AM74°0%4 mph
  2. 1 AM74°1%3 mph
  3. 2 AM73°6%2 mph
  4. 3 AM73°7%2 mph
  5. 4 AM74°7%2 mph
  6. 5 AM75°12%1 mph
  7. 6 AM75°13%6 mph
  8. 7 AM76°26%14 mph
  9. 8 AM76°72%7 mph
  10. 9 AM78°59%12 mph
  11. 10 AM78°43%13 mph
  12. 11 AM76°22%9 mph
  13. 12 PM79°17%10 mph
  14. 1 PM81°17%10 mph
  15. 2 PM84°17%12 mph
  16. 3 PM85°19%11 mph
  17. 4 PM85°11%12 mph
  18. 5 PM86°7%11 mph
  19. 6 PM85°4%11 mph
  20. 7 PM83°3%10 mph
  21. 8 PM82°2%8 mph
  22. 9 PM80°1%9 mph
  23. 10 PM79°0%8 mph
  24. 11 PM79°0%9 mph
  25. 12 AM79°0%9 mph
  26. 1 AM79°0%9 mph
  27. 2 AM79°0%7 mph
  28. 3 AM79°0%7 mph
  29. 4 AM80°0%8 mph
  30. 5 AM80°0%9 mph
  31. 6 AM79°0%10 mph
  32. 7 AM79°0%9 mph
  33. 8 AM81°0%11 mph
  34. 9 AM82°1%12 mph
  35. 10 AM83°0%13 mph
  36. 11 AM83°0%11 mph
  37. 12 PM86°0%10 mph
  38. 1 PM86°0%11 mph
  39. 2 PM87°0%8 mph
  40. 3 PM88°0%10 mph
  41. 4 PM88°0%9 mph
  42. 5 PM86°0%11 mph
  43. 6 PM84°0%11 mph
  44. 7 PM84°0%9 mph
  45. 8 PM82°0%7 mph
  46. 9 PM81°0%7 mph
  47. 10 PM80°0%9 mph
  48. 11 PM79°0%6 mph

In depth

Katy starts the period under overcast, with the mercury at 25 °C and a feels-like of 29 °C. Today's forecast calls for thunderstorm, topping out near 30 °C before falling back to 23 °C overnight. Winds blow mainly from the S around 23 km/h, with gusts up to 50 km/h. A warming trend takes daytime highs from 30 to 33 °C over the coming week. No meaningful rain shows up in the seven-day outlook, so dry conditions should dominate. Tomorrow brings thunderstorm with a high of 31 °C and a 1% chance of precipitation. The UV index reaches 8 today, so sun protection is sensible during the middle of the day. Sunrise comes at 06:23 and sunset at 20:26, giving 14.1 hours of daylight. Current humidity sits at 94% with pressure near 1012 hPa. Looking further out, Thursday shows thunderstorm with a high around 33 °C, while Saturday ends the week at 33 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.

Air quality

21

Good

US AQI · European AQI 14

Air quality in Katy is currently good, with a US AQI of 21 (European AQI 14). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 4.1 µg/m³.

Pollutants

PM2.5
4.1 µg/m³
PM10
5.2 µg/m³
Ozone (O₃)
36 µg/m³
NO₂
4.5 µg/m³
SO₂
0.6 µg/m³
CO
114 µg/m³
Dust
0 µg/m³

Sun & UV

Sunrise
6:23 AM
Sunset
8:26 PM
Daylight
14h 03m
Max UV
8.45 Very high

Wind

Wind
6 mph
Gusts
12 mph
Direction
SSE (162°)

Farming weather

Soil temperatures today read surface 25.4 °C, 6 cm 26.6 °C, 18 cm 26.9 °C, 54 cm 26.1 °C. Soil moisture sits at 0-1 cm at 0.45 m³/m³, 3-9 cm at 0.46 m³/m³, 27-81 cm at 0.45 m³/m³. For maize, the root-zone reading is above the ideal 0.2-0.35 m³/m³ band. Reference evapotranspiration totals 41 mm against only 0 mm of expected rain — a 40 mm deficit, so irrigation will be needed this week. A suitable spraying window opens around 07:00 on 2026-06-23, with winds at or below 15 km/h and no rain expected. Heat stress is likely for wheat with highs reaching 33 °C (threshold 32 °C). Projected growing degree days over the next week: maize 126, wheat 164.

Topsoil moisture
0.456 m³/m³
Soil temp
78°F
ET₀ today
3.76 mm
Spray window
~5:00
Rain (next 7d)
0 in
Wind
6 mph
Humidity
94%

Full farming outlook for Katy →

Advisory summary

No weather alert thresholds are crossed for Katy in the current forecast (derived from forecast data, not official warnings). Conditions may still change — check back for updates.

All data for Katy
Every forecast variable for Katy with human-readable labels
VariableValue
CityKaty, Texas, United States
Coordinates29.78579, -95.8244
Elevation42 m
TimezoneAmerica/Chicago
Population16,158
Observed at (local)8:30 AM
Temperature (2 m)77°F
Apparent temperature81°F
Relative humidity (2 m)94%
Dew point (2 m)72°F
Precipitation (last hour)0 in
Rain0 in
Showers0 in
Snowfall0 in
Weather code (WMO)3
Cloud cover100%
Surface pressure29.7 inHg
Sea-level pressure29.9 inHg
Wind speed (10 m)6 mph
Wind gusts (10 m)12 mph
Wind direction (10 m)162° (SSE)
Visibility8 mi
UV index0
Day / nightDay
Today max / min86°F / 73°F
Today feels-like max / min97°F / 79°F
Today precipitation sum0 in
Today rain sum0 in
Today snowfall sum0 in
Today max precip probability72%
Today max wind / gusts14 mph / 31 mph
Dominant wind direction176° (S)
Sunrise / sunset6:23 AM / 8:26 PM
Daylight duration14h 03m
Sunshine duration7h 00m
Max UV index8.45
Reference evapotranspiration (ET₀)3.76 mm
Topsoil moisture (0–1 cm)0.456 m³/m³
Surface soil temperature78°F
US AQI21
European AQI14
PM2.54.1 µg/m³
PM105.2 µg/m³
Ozone (O₃)36 µg/m³
Nitrogen dioxide (NO₂)4.5 µg/m³
Sulphur dioxide (SO₂)0.6 µg/m³
Carbon monoxide (CO)114 µg/m³
Dust0 µg/m³

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Frequently asked questions

Will it rain in Katy tomorrow?

Rain is unlikely in Katy tomorrow; the precipitation chance stays around 1%.

What is the temperature in Katy today?

Today Katy sees thunderstorm with a high of 30 °C and a low of 23 °C.

How hot will it be in Katy tomorrow?

Tomorrow's high in Katy is forecast at 31 °C with thunderstorm.

Is it windy in Katy today?

Yes, yes — gusts up to 50 km/h today.

What is the UV index in Katy today?

The UV index peaks at 8 today, which is very high.

What time is sunrise and sunset in Katy today?

The sun rises at 06:23 and sets at 20:26 local time.

Is the air quality in Katy good today?

Air quality is good right now, with a US AQI reading of 21.