Collin County (Plano)
September
Weather in Collin County for September 2025
Your guide to Collin County weather in September - trends and predictions
In general, the average temperature in Collin County at the beginning of September is 34.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 33.6 °F by the end of September.
The climate of Collin County in September is notably wet, with an average of 11 rainy days, and a total of 63.6 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
34°/22°
Temperatures
21 km/h
Avg max wind
50 %
Avg humidity
Collin County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  35° | 2  36° | 3  32° | 4  31° | 5 35° | 6 37° | 7 38° |
| 8 38° | 9 36° | 10 35° | 11  31° | 12  31° | 13 32° | 14  34° |
| 15 32° | 16 32° | 17 34° | 18 36° | 19 37° | 20  37° | 21 37° |
| 22 35° | 23 32° | 24 35° | 25 31° | 26 33° | 27 33° | 28 33° |
| 29 35° | 30 35° |
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Temperatures trend during September in Collin 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 | Partly cloudy | 35° /23° | 0.7 mm | 8 | |
| Sept. 2 | Cloudy | 36° /23° | 0.3 mm | 8 | |
| Sept. 3 | Thundery outbreaks possible | 32° /23° | 4 mm | 7 | |
| Sept. 4 | Sunny | 31° /22° | 1.8 mm | 8 | |
| Sept. 5 | Partly cloudy | 35° /22° | 0.7 mm | 8 | |
| Sept. 6 | Thundery outbreaks possible | 37° /25° | 0 mm | 9 | |
| Sept. 7 | Sunny | 38° /24° | 0 mm | 9 | |
| Sept. 8 | Sunny | 38° /24° | 0.2 mm | 10 | |
| Sept. 9 | Sunny | 36° /21° | 0 mm | 9 | |
| Sept. 10 | Partly cloudy | 35° /19° | 0 mm | 9 | |
| Sept. 11 | Light rain shower | 31° /21° | 2.2 mm | 7 | |
| Sept. 12 | Moderate or heavy rain shower | 31° /21° | 29 mm | 8 | |
| Sept. 13 | Cloudy | 32° /22° | 0 mm | 8 | |
| Sept. 14 | Overcast | 34° /21° | 2.5 mm | 8 | |
| Sept. 15 | Cloudy | 32° /22° | 1.7 mm | 7 | |
| Sept. 16 | Partly cloudy | 32° /21° | 0.6 mm | 8 | |
| Sept. 17 | Sunny | 34° /20° | 0 mm | 8 | |
| Sept. 18 | Sunny | 36° /23° | 0 mm | 9 | |
| Sept. 19 | Cloudy | 37° /23° | 0 mm | 9 | |
| Sept. 20 | Heavy rain at times | 37° /23° | 1.3 mm | 9 | |
| Sept. 21 | Thundery outbreaks possible | 37° /24° | 0.7 mm | 9 | |
| Sept. 22 | Thundery outbreaks possible | 35° /23° | 2.2 mm | 8 | |
| Sept. 23 | Thundery outbreaks possible | 32° /24° | 9.3 mm | 7 | |
| Sept. 24 | Sunny | 35° /23° | 2.7 mm | 8 | |
| Sept. 25 | Light rain shower | 31° /21° | 3.7 mm | 7 | |
| Sept. 26 | Sunny | 33° /18° | 0 mm | 9 | |
| Sept. 27 | Partly cloudy | 33° /19° | 0 mm | 9 | |
| Sept. 28 | Partly cloudy | 33° /20° | 0 mm | 8 | |
| Sept. 29 | Sunny | 35° /21° | 0 mm | 8 | |
| Sept. 30 | Sunny | 35° /21° | 0 mm | 9 | |
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Important Notice
Our weather forecast for Collin 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 Collin County forecast closer to your planned date for the most up-to-date weather information.
Collin County in September - FAQ
What are the expected maximum and minimum temperatures in Collin County during September?
During September, expect a variety of temperatures with highs around 34° and lows near 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Collin County during September?
Moderate rainfall is anticipated in Collin County during September, with a total of 63.6 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Collin County during September?
The average wind speed in Collin County during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Collin County
Explore the daily rainfall trends and prepare for Collin Countys September weather 💧
UV exposure in Collin County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Collin County?Get accurate weather forecasts for Collin County, located at latitude 33.02 and longitude -96.699. Stay updated with localized weather information tailored for Collin County.
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