Weld County (Greeley)
September
Weather in Weld County, Colorado for September 2026
Your guide to Weld County weather in September - trends and predictions
So far, September 2026 in Weld County is slightly warmer than the historical average by 1.1 °F.
The forecast for the next days in Weld County predicts a temperature of 23.5 °F, which is cooler than the historical average.
In general, the average temperature in Weld County at the beginning of September is 31.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.9 °F by the end of September.
Weld County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 67.7 mm.
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Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
28°/11°
Temperatures
23 km/h
Avg max wind
46 %
Avg humidity
Weld County Weather September
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /13° | 0.1 mm | 7 | |
| Sept. 2 | Sunny | 32° /13° | 0.6 mm | 9 | |
| Sept. 3 | Sunny | 33° /12° | 0.1 mm | 9 | |
| Sept. 4 | Sunny | 33° /12° | 2.2 mm | 8 | |
| Sept. 5 |  Patchy rain possible | 28° /12° | 0 mm | 7 | |
| Sept. 6 | Sunny | 29° /10° | 1.4 mm | 5 | |
| Sept. 7 |  Partly cloudy | 32° /13° | 0.9 mm | 7 | |
| Sept. 8 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 9 |  Overcast | 31° /12° | 0.2 mm | 8 | |
| Sept. 10 | Partly cloudy | 32° /12° | 0 mm | 8 | |
| Sept. 11 | Patchy rain possible | 30° /14° | 2.3 mm | 7 | |
| Sept. 12 | Partly cloudy | 29° /12° | 0.9 mm | 7 | |
| Sept. 13 | Partly cloudy | 30° /11° | 1.6 mm | 7 | |
| Sept. 14 | Sunny | 30° /13° | 0 mm | 5 | |
| Sept. 15 |  Patchy light drizzle | 29° /10° | 0.3 mm | 8 | |
| Sept. 16 | Partly cloudy | 28° /11° | 1.3 mm | 5 | |
| Sept. 17 | Light rain shower | 27° /13° | 3.5 mm | 4 | |
| Sept. 18 |  Mist | 26° /10° | 1.6 mm | 4 | |
| Sept. 19 | Sunny | 28° /8° | 3.8 mm | 6 | |
| Sept. 20 |  Cloudy | 27° /10° | 1.2 mm | 6 | |
| Sept. 21 | Overcast | 23° /10° | 0 mm | 6 | |
| Sept. 22 |  Heavy rain | 22° /8° | 32.2 mm | 5 | |
| Sept. 23 | Mist | 22° /9° | 0.1 mm | 4 | |
| Sept. 24 | Partly cloudy | 24° /10° | 0 mm | 4 | |
| Sept. 25 | Sunny | 27° /9° | 0.3 mm | 5 | |
| Sept. 26 | Sunny | 30° /13° | 0 mm | 6.2 | |
| Sept. 27 | Overcast | 29° /16° | 0.1 mm | 6.1 | |
| Sept. 28 | Overcast | 26° /16° | 0.1 mm | 5.4 | |
| Sept. 29 | Overcast | 23° /15° | 0.3 mm | 4.4 | |
| Sept. 30 | Overcast | 22° /13° | 0 mm | 5 | |
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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 28° 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?
Moderate rainfall is anticipated in Weld County during September, with a total of 67.7 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Weld County during September?
The average wind speed in Weld County during September is 23 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 💧
Typically, Weld County has 8 rainy days in September with a total of 67.7 mm of rainfall.
UV exposure in Weld County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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