Katy (TX)
September
Weather in Katy, Texas for September 2026
Your guide to Katy weather in September - trends and predictions
Until now, September 2026 in Katy has been nearly identical to the historical average, with a temperature of 34.1 °F (showing only a slight deviation of 0 °F).
In general, the average temperature in Katy at the beginning of September is 32.9 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 34.3 °F by the end of September.
Katy experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 88.4 mm.
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Temperatures
Rain 🌧️
More
7
Dry days
23
Rainy days
0
Snow days
34°/25°
Temperatures
18 km/h
Avg max wind
68 %
Avg humidity
Katy Weather September
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Temperatures trend during September in Katy
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September weather in Katy day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 32° /25° | 0.7 mm | 5 | |
| Sept. 2 | Moderate rain at times | 35° /26° | 1.6 mm | 2 | |
| Sept. 3 | Moderate or heavy rain shower | 32° /24° | 27.8 mm | 2 | |
| Sept. 4 |  Heavy rain at times | 32° /26° | 2.3 mm | 4 | |
| Sept. 5 |  Patchy rain possible | 34° /24° | 1.2 mm | 9 | |
| Sept. 6 | Moderate or heavy rain shower | 30° /26° | 8.9 mm | 4 | |
| Sept. 7 | Patchy rain possible | 35° /25° | 0.7 mm | 11 | |
| Sept. 8 | Moderate or heavy rain shower | 34° /25° | 3 mm | 7 | |
| Sept. 9 | Patchy rain possible | 33° /26° | 1.7 mm | 4 | |
| Sept. 10 | Patchy rain possible | 34° /24° | 1.4 mm | 8 | |
| Sept. 11 | Moderate or heavy rain shower | 33° /25° | 5.3 mm | 10 | |
| Sept. 12 | Patchy rain possible | 37° /26° | 0.2 mm | 7 | |
| Sept. 13 | Heavy rain at times | 33° /26° | 3.5 mm | 9 | |
| Sept. 14 | Moderate or heavy rain shower | 34° /25° | 6.8 mm | 10 | |
| Sept. 15 | Heavy rain at times | 36° /26° | 2.3 mm | 10 | |
| Sept. 16 | Heavy rain at times | 35° /26° | 2.8 mm | 7 | |
| Sept. 17 | Patchy rain possible | 32° /27° | 0.5 mm | 2 | |
| Sept. 18 | Moderate rain at times | 35° /25° | 1.5 mm | 9 | |
| Sept. 19 |  Partly cloudy | 35° /23° | 0 mm | 10 | |
| Sept. 20 |  Overcast | 35° /23° | 0 mm | 8 | |
| Sept. 21 | Moderate or heavy rain shower | 35° /25° | 2.9 mm | 3 | |
| Sept. 22 | Patchy rain possible | 36° /25° | 2.2 mm | 9 | |
| Sept. 23 | Moderate rain at times | 36° /25° | 1 mm | 8 | |
| Sept. 24 | Patchy rain possible | 36° /25° | 0.3 mm | 2 | |
| Sept. 25 | Overcast | 34° /23° | 0 mm | 5 | |
| Sept. 26 | Overcast | 33° /22° | 0 mm | 4 | |
| Sept. 27 | Overcast | 35° /23° | 0 mm | 4 | |
| Sept. 28 | Moderate or heavy rain shower | 33° /24° | 4.4 mm | 8 | |
| Sept. 29 | Moderate or heavy rain shower | 34° /24° | 5.4 mm | 3 | |
| Sept. 30 | Patchy rain possible | 35° /25° | 1.2 mm | 7.7 | |
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Important Notice
Our weather forecast for Katy in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Katy forecast closer to your planned date for the most up-to-date weather information.
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Katy in September - FAQ
What are the expected maximum and minimum temperatures in Katy during September?
During September, expect a variety of temperatures with highs around 34° and lows near 25°, suitable for diverse activities and preferences.
How much rainfall should be expected in Katy during September?
Moderate rainfall is anticipated in Katy during September, with a total of 88.4 mm spread over approximately 23 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Katy during September?
The average wind speed in Katy during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Katy
Explore the daily rainfall trends and prepare for Katys September weather 💧
Typically, Katy has 23 rainy days in September with a total of 88.4 mm of rainfall.
UV exposure in Katy during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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