Katy, United States experiences average highs of 27°C (81°F) and lows of 17°C (63°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 0.9°C (1.6°F) across the available records.
Katy, United States Weather & Climate 2026
Monthly climate averages for Katy, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.1/10
Best: February, March, April, October, November
UV Index
6
High
Temperature 27°C / 17°C
Feels Like 28°C / 18°C
Rainy Days 11
Rainfall 104 mm
Sunshine 9 h
Humidity 74%
Wind Speed 18 km/h
Dew Point 17°C
Snow Days 1 days
Frost Days 1 days
Hottest Month
34°C
August
Avg Low25°C
Rain15days
Coldest Month
8°C
January
Avg High17°C
Rain10days
Driest Month
8days
October
Avg High28°C
Avg Low18°C
Windiest Month
22 km/h
April (Gusts 43)
Worst Time to Visit
Consider avoiding July, August due to extreme heat, frequent rain, oppressive humidity.
Sun Position
Sunrise 06:24
Daylight 14h
Sunset 20:27
Live conditions—
Katy on the map · live conditions
Katy, United States
- Continent
- Americas
- Country
- United States
- City
- Katy
- Population
- 16.2K
- Elevation
- 42 m
- Coordinates
- 29.79°, -95.82°
Seasonal Breakdown
Spring
Mar–May
Avg High 27°C
Avg Low 17°C
Rain 12 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 33°C
Avg Low 25°C
Rain 14 days/mo
Autumn
Sep–Nov
Avg High 27°C
Avg Low 18°C
Rain 10 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 19°C
Avg Low 10°C
Rain 9 days/mo
1/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 17°C / 8°C . Feb: 20°C / 10°C . Mar: 24°C / 14°C . Apr: 26°C / 17°C . May: 30°C / 21°C . Jun: 32°C / 24°C . Jul: 34°C / 25°C . Aug: 34°C / 25°C . Sep: 31°C / 23°C . Oct: 28°C / 18°C . Nov: 23°C / 14°C . Dec: 19°C / 11°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 105 mm. Feb: 67 mm. Mar: 81 mm. Apr: 96 mm. May: 160 mm. Jun: 121 mm. Jul: 117 mm. Aug: 137 mm. Sep: 110 mm. Oct: 69 mm. Nov: 90 mm. Dec: 99 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 72%. Feb: 76%. Mar: 73%. Apr: 73%. May: 76%. Jun: 76%. Jul: 75%. Aug: 74%. Sep: 75%. Oct: 70%. Nov: 73%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 20 km/h . Feb: 20 km/h . Mar: 21 km/h . Apr: 22 km/h . May: 19 km/h . Jun: 17 km/h . Jul: 15 km/h . Aug: 15 km/h . Sep: 14 km/h . Oct: 17 km/h . Nov: 17 km/h . Dec: 19 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 11h. Aug: 11h. Sep: 10h. Oct: 9h. Nov: 8h. Dec: 7h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 5. Mar: UV 7. Apr: UV 8. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 7. Oct: UV 6. Nov: UV 5. Dec: UV 4.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 1 days. Feb: 0 days. Mar: 0 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 0 days.
Climate Trends
Average highs have warmed by 0.9°C (1.6°F) across the available records. Average rainfall is trending drier by about 23 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 34°C | Aug · 34°C |
| Coldest month | Jan 2025 · 6°C | Jan · 8°C |
| Wettest month | Jun 2025 · 196 mm | May · 160 mm |
| Windiest month | Apr 2025 · 23 km/h | Apr · 22 km/h |
Month-by-Month Weather Table
January
Good 
February best
Good March best
Excellent April best
Excellent May
Fair June
Poor July
Poor August
Poor September
Fair October best
Excellent November best
Excellent December
Good | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 17°C / 8°C | 16°C / 5°C | 10days (105 mm) Wet | 6.7h Fair | 72% Muggy | 3.7 Moderate | Good | View Details |
| February best | 20°C / 10°C | 19°C / 8°C | 9days (67 mm) Wet | 6.7h Fair | 76% Humid | 4.7 Moderate | Good | View Details |
| March best | 24°C / 14°C | 24°C / 13°C | 11days (81 mm) Wet | 8.2h Good | 73% Muggy | 6.5 High | Excellent | View Details |
| April best | 26°C / 17°C | 27°C / 17°C | 11days (96 mm) Wet | 9.2h Good | 73% Muggy | 7.5 Very High | Excellent | View Details |
| May | 30°C / 21°C | 33°C / 23°C | 13days (160 mm) Wet | 10.4h Excellent | 76% Humid | 8.2 Very High | Fair | View Details |
| June | 32°C / 24°C | 37°C / 28°C | 13days (121 mm) Wet | 11.6h Excellent | 76% Humid | 8.4 Very High | Poor | View Details |
| July | 34°C / 25°C | 39°C / 30°C | 13days (117 mm) Wet | 11.4h Excellent | 75% Muggy | 8 Very High | Poor | View Details |
| August | 34°C / 25°C | 39°C / 30°C | 15days (137 mm) Wet | 10.9h Excellent | 74% Muggy | 8.1 Very High | Poor | View Details |
| September | 31°C / 23°C | 35°C / 26°C | 12days (110 mm) Wet | 9.9h Good | 75% Muggy | 7.3 Very High | Fair | View Details |
| October best | 28°C / 18°C | 30°C / 19°C | 8days (69 mm) Wet | 9.1h Good | 70% Muggy | 6 High | Excellent | View Details |
| November best | 23°C / 14°C | 23°C / 12°C | 9days (90 mm) Wet | 7.6h Good | 73% Muggy | 4.5 Moderate | Excellent | View Details |
| December | 19°C / 11°C | 19°C / 9°C | 9days (99 mm) Wet | 6.6h Fair | 75% Muggy | 3.7 Moderate | Good | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Katy are February, March, April, October, November, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Katy, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Katy is August, with average daytime highs of 34°C (93°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Katy is January, with average overnight lows of 8°C (46°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Katy is May, averaging 160mm of precipitation across 13 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Katy runs through August, May, June, July, with the heaviest rainfall in August. Based on 10-year averages for Katy.
Katy receives approximately 108 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Katy.
The least favorable months to visit Katy are July, August, primarily due to extreme heat, frequent rain, oppressive humidity. For the best conditions, consider February, March, April, October, November instead.
The annual average UV index in Katy is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Katy is 74%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Katy receives snow. Months with snowfall average 1 snow days and 1 cm (0 in) of accumulation, with about 1 frost days during winter.
Average wind speeds in Katy are 18 km/h (11 mph). The windiest month is April with peak winds reaching 22 km/h (13 mph) (gusts up to 43 km/h / 27 mph).
Katy averages 5 clear-sky days per month with overall cloud cover around 57%. The clearest skies occur in October.
The annual average dew point in Katy is 17°C (63°F), which feels noticeably humid. Summer months may feel slightly sticky, but conditions remain manageable for most people.
Katy has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Katy ranges from 18°C (64°F) to 28°C (82°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
June is not the best time to visit Katy, with a climate score of 3.6/10. Consider visiting during February, March, April, October, November instead for better conditions.
For June in Katy, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 32°C (90°F) and 13 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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