Katy Weather in September

September in Katy brings very high temperatures, with daytime highs of 32°C (90°F) and nights around 21°C (70°F). Quite a bit of rainfall is expected, around 115 mm (4.5 in), so pack an umbrella.

Rainfall in Katy in September

Historically, September sees about 10 days of rain, with a monthly average of 115 mm (4.5 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Katy in September

September in Katy brings very high temperatures, with highs of 32°C (90°F) and nights around 21°C (70°F). The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. At 21°C (70°F) overnight, nights are warm enough to sit outside comfortably in light clothing.

Sunshine in Katy in September

With approximately 235 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

For Katy itself, March and November generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Katy's climate page.

Katy Temperature in September

Min Temperature 21°C (70°F)  

Max Temperature 32°C (90°F)  

Chance of Rain 34%  

Precipitation 115 mm (4.5 in)  

Rainy days 10 days  

Humidity 77% *  

Sunshine 235 hours *  

Percentage Sunshine 64% *  

* Data from: Houston, the United States of America (44 KM, 27 Miles).

What to Wear in Katy in September

Warm but pleasant conditions in Katy in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Katy in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Katy's climate page.

More climate data for Katy

Temperature Rainfall Sunshine Humidity

See the full Katy climate overview or explore weather in the United States of America.