Harris County (Houston)
September
Weather in Harris County for September 2025
Your guide to Harris County weather in September - trends and predictions
In general, the average temperature in Harris County at the beginning of September is 34.1 °F. As the month progressed, temperatures tended to slightly increase, reaching an average of 34.4 °F by the end of September.
Harris County sees moderate rainfall in September, averaging 10 rainy days.
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20
Dry days
10
Rainy days
0
Snow days
36°/26°
Temperatures
18 km/h
Avg max wind
60 %
Avg humidity
Harris County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  34° | 2  35° | 3  35° | 4 32° | 5 32° | 6  35° | 7  36° |
| 8 37° | 9 35° | 10 35° | 11 33° | 12  33° | 13 35° | 14  34° |
| 15 35° | 16 34° | 17  36° | 18 36° | 19 35° | 20 34° | 21 35° |
| 22 35° | 23 35° | 24 34° | 25 34° | 26 33° | 27 34° | 28 36° |
| 29 34° | 30 36° |
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Temperatures trend during September in Harris County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 34° /25° | 4.3 mm | 8 | |
| Sept. 2 | Patchy rain possible | 35° /24° | 1.8 mm | 8 | |
| Sept. 3 | Thundery outbreaks possible | 35° /25° | 0.2 mm | 8 | |
| Sept. 4 | Light rain shower | 32° /26° | 3.5 mm | 7 | |
| Sept. 5 | Patchy rain possible | 32° /25° | 1.3 mm | 7 | |
| Sept. 6 | Cloudy | 35° /25° | 0.1 mm | 8 | |
| Sept. 7 | Partly cloudy | 36° /24° | 0 mm | 9 | |
| Sept. 8 | Cloudy | 37° /24° | 0 mm | 9 | |
| Sept. 9 | Thundery outbreaks possible | 35° /24° | 0.1 mm | 8 | |
| Sept. 10 | Partly cloudy | 35° /25° | 2.5 mm | 8 | |
| Sept. 11 | Partly cloudy | 33° /23° | 5 mm | 8 | |
| Sept. 12 | Overcast | 33° /24° | 0.1 mm | 8 | |
| Sept. 13 | Cloudy | 35° /24° | 0 mm | 8 | |
| Sept. 14 | Moderate or heavy rain shower | 34° /25° | 7.4 mm | 8 | |
| Sept. 15 | Light rain shower | 35° /25° | 1.6 mm | 9 | |
| Sept. 16 | Patchy rain possible | 34° /25° | 0.4 mm | 8 | |
| Sept. 17 | Light drizzle | 36° /25° | 0.5 mm | 8 | |
| Sept. 18 | Patchy rain possible | 36° /25° | 0.1 mm | 8 | |
| Sept. 19 | Partly cloudy | 35° /24° | 0 mm | 8 | |
| Sept. 20 | Patchy rain possible | 34° /24° | 0.1 mm | 8 | |
| Sept. 21 | Thundery outbreaks possible | 35° /25° | 0.2 mm | 8 | |
| Sept. 22 | Patchy light drizzle | 35° /25° | 0.2 mm | 8 | |
| Sept. 23 | Overcast | 35° /25° | 5.7 mm | 8 | |
| Sept. 24 | Overcast | 34° /24° | 7.3 mm | 8 | |
| Sept. 25 | Overcast | 34° /25° | 0 mm | 8 | |
| Sept. 26 | Patchy rain possible | 33° /23° | 11.7 mm | 8 | |
| Sept. 27 | Patchy rain possible | 34° /23° | 0.2 mm | 8 | |
| Sept. 28 | Cloudy | 36° /23° | 0 mm | 9 | |
| Sept. 29 | Thundery outbreaks possible | 34° /23° | 0 mm | 8 | |
| Sept. 30 | Patchy rain possible | 36° /24° | 0.1 mm | 9 | |
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Important Notice
Our weather forecast for Harris County 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 Harris County forecast closer to your planned date for the most up-to-date weather information.
Harris County in September - FAQ
What are the expected maximum and minimum temperatures in Harris County during September?
With daytime temperatures soaring above 36° and not dropping much below 26° at night, September in Harris County is quite hot. Staying hydrated and avoiding peak sun hours is advisable.
How much rainfall should be expected in Harris County during September?
In September, Harris County can expect light to moderate rainfall, totaling 38.5 mm across approximately 10 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Harris County during September?
The average wind speed in Harris County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Harris County
Explore the daily rainfall trends and prepare for Harris Countys September weather 💧
UV exposure in Harris County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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