The weather in Katy in September is very hot. The average temperatures are between 23°C and 32°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Katy. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Katy in September 2025.
If you’re planning to visit Katy in the near future, we highly recommend that you review the 14 day weather forecast for Katy before you arrive.
Temperatures
32° / 23°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
203
mm
Sun Hours
11.0
Hrs
