Weld County (Greeley)
September
Weather in Weld County, Colorado for September 2025
Your guide to Weld County weather in September - trends and predictions
Until now, September 2025 in Weld County is slightly cooler than the historical average by -1.9 °F.
Expect cooler weather in the next days in Weld County with the forecast suggesting a temperature of 28.7 °F, lower than the historical average.
In general, the average temperature in Weld County at the beginning of September is 29.7 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 29.3 °F by the end of September.
With an average of 4 rainy days, Weld County experiences minimal rainfall in September.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
29°/11°
Temperatures
24 km/h
Avg max wind
39 %
Avg humidity
Weld County Weather September
Move between months or click on a day
Temperatures trend during September in Weld County
See the weather trend as well as the moving average line
September weather in Weld County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /12° | 0 mm | 8 | |
| Sept. 2 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 3 |  Partly cloudy | 32° /12° | 0 mm | 8 | |
| Sept. 4 |  Moderate rain at times | 32° /12° | 3.3 mm | 8 | |
| Sept. 5 |  Patchy rain possible | 23° /12° | 0.1 mm | 6 | |
| Sept. 6 | Sunny | 27° /8° | 0 mm | 7 | |
| Sept. 7 | Partly cloudy | 31° /12° | 0 mm | 8 | |
| Sept. 8 | Sunny | 31° /12° | 0 mm | 8 | |
| Sept. 9 | Patchy rain possible | 32° /12° | 0.3 mm | 7 | |
| Sept. 10 | Partly cloudy | 32° /14° | 0 mm | 8 | |
| Sept. 11 | Patchy rain possible | 29° /16° | 3.5 mm | 7 | |
| Sept. 12 | Partly cloudy | 30° /13° | 1.4 mm | 7 | |
| Sept. 13 | Partly cloudy | 27° /11° | 2.5 mm | 7 | |
| Sept. 14 | Sunny | 29° /12° | 0 mm | 7 | |
| Sept. 15 |  Patchy light drizzle | 31° /9° | 0.4 mm | 8 | |
| Sept. 16 | Partly cloudy | 28° /9° | 0 mm | 1.4 | |
| Sept. 17 | Sunny | 25° /11° | 0 mm | 1.4 | |
| Sept. 18 |  Overcast | 21° /10° | 0 mm | 1.5 | |
| Sept. 19 | Sunny | 27° /6° | 0 mm | 1.7 | |
| Sept. 20 | Partly cloudy | 31° /14° | 0.1 mm | 1.5 | |
| Sept. 21 | Sunny | 29° /16° | 0.1 mm | 0 | |
| Sept. 22 | Sunny | 28° /15° | 0 mm | 6 | |
| Sept. 23 | Sunny | 31° /13° | 0 mm | 6 | |
| Sept. 24 | Sunny | 33° /14° | 0 mm | 6 | |
| Sept. 25 | Sunny | 33° /15° | 0 mm | 6 | |
| Sept. 26 | Sunny | 31° /14° | 0 mm | 6 | |
| Sept. 27 | Sunny | 32° /14° | 0 mm | 6 | |
| Sept. 28 | Sunny | 31° /15° | 0 mm | 6 | |
| Sept. 29 | Patchy rain possible | 22° /12° | 0.9 mm | 4 | |
| Sept. 30 |  Cloudy | 23° /9° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Weld 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 Weld County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Weld County in September - FAQ
What are the expected maximum and minimum temperatures in Weld County during September?
Enjoy moderate daytime temperatures of up to 29° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Weld County during September?
Significant rainfall exceeding 108.1 mm is expected in Weld County during September, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Weld County during September?
The average wind speed in Weld County during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Weld County
Explore the daily rainfall trends and prepare for Weld Countys September weather 💧
UV exposure in Weld County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Weld County
Select a location for an accurate weather forecast
More Locations Quick links
More Weld County weather pages
You are here
Where is Weld County?Get accurate weather forecasts for Weld County, located at latitude 40.423 and longitude -104.709. Stay updated with localized weather information tailored for Weld County.
Found a mistake?
We appreciate your attention to details. Tell us here.