Collin County (Frisco)
September
Weather in Collin County, Texas for September 2027
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 35.2 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 33 °C by the end of September.
Collin County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 65.8 mm.
Is September a good time to visit Collin County? check out the best time to travel to Collin County page.
✨ Is September a good time to visit Collin County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
35°/23°
Temperatures
20 km/h
Avg max wind
51 %
Avg humidity
Collin County Weather September
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Temperatures trend during September in Collin County
See the weather trend as well as the moving average line
September weather in Collin County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 36° /24° | 1.4 mm | 9 | |
| Sept. 2 |  Light rain | 35° /24° | 3 mm | 8 | |
| Sept. 3 |  Thundery outbreaks possible | 34° /23° | 1.8 mm | 8 | |
| Sept. 4 |  Sunny | 35° /23° | 0.8 mm | 8 | |
| Sept. 5 |  Partly cloudy | 36° /24° | 0.3 mm | 9 | |
| Sept. 6 | Thundery outbreaks possible | 36° /23° | 6.6 mm | 9 | |
| Sept. 7 | Sunny | 36° /24° | 0 mm | 9 | |
| Sept. 8 | Sunny | 37° /23° | 0.2 mm | 9 | |
| Sept. 9 | Sunny | 35° /21° | 0.1 mm | 9 | |
| Sept. 10 | Sunny | 36° /21° | 0.2 mm | 9 | |
| Sept. 11 | Light rain shower | 34° /23° | 1.9 mm | 8 | |
| Sept. 12 |  Moderate rain | 35° /23° | 16.5 mm | 8 | |
| Sept. 13 |  Overcast | 34° /24° | 0 mm | 8 | |
| Sept. 14 | Overcast | 34° /24° | 0.2 mm | 8 | |
| Sept. 15 |  Cloudy | 34° /24° | 0.8 mm | 8 | |
| Sept. 16 | Sunny | 35° /24° | 0.3 mm | 8 | |
| Sept. 17 | Sunny | 36° /23° | 0.1 mm | 8 | |
| Sept. 18 | Sunny | 36° /25° | 0 mm | 8.4 | |
| Sept. 19 | Overcast | 36° /25° | 0.4 mm | 8 | |
| Sept. 20 | Light rain | 36° /24° | 2.9 mm | 7 | |
| Sept. 21 | Thundery outbreaks possible | 36° /24° | 0.3 mm | 7 | |
| Sept. 22 | Sunny | 35° /23° | 0.9 mm | 8 | |
| Sept. 23 | Thundery outbreaks possible | 34° /24° | 12 mm | 6 | |
| Sept. 24 | Moderate rain | 34° /23° | 10.4 mm | 6 | |
| Sept. 25 | Patchy rain possible | 31° /20° | 2 mm | 6 | |
| Sept. 26 | Overcast | 33° /20° | 0 mm | 7 | |
| Sept. 27 | Sunny | 34° /20° | 0.1 mm | 7 | |
| Sept. 28 | Patchy rain possible | 33° /21° | 1.2 mm | 7 | |
| Sept. 29 | Overcast | 34° /22° | 0 mm | 6 | |
| Sept. 30 | Patchy rain possible | 33° /22° | 1.3 mm | 6 | |
| Next | |||||
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.
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Collin County in September - FAQ
What are the expected maximum and minimum temperatures in Collin County during September?
With daytime temperatures soaring above 35° and not dropping much below 23° at night, September in Collin County is quite hot. Staying hydrated and avoiding peak sun hours is advisable.
How much rainfall should be expected in Collin County during September?
Moderate rainfall is anticipated in Collin County during September, with a total of 65.8 mm spread over approximately 6 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 20 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 💧
Typically, Collin County has 6 rainy days in September with a total of 65.8 mm of rainfall.
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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