Greeley (CO)
September
Weather in Greeley, Colorado for September 2025
Your guide to Greeley weather in September - trends and predictions
Until now, September 2025 in Greeley is slightly cooler than the historical average by -1.9 °F.
Expect cooler weather in the next days in Greeley with the forecast suggesting a temperature of 28.7 °F, lower than the historical average.
In general, the average temperature in Greeley 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, Greeley experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
29°/11°
Temperatures
24 km/h
Avg max wind
39 %
Avg humidity
Greeley Weather September
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Temperatures trend during September in Greeley
See the weather trend as well as the moving average line
September weather in Greeley day by day
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| 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 | |
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Important Notice
Our weather forecast for Greeley 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 Greeley forecast closer to your planned date for the most up-to-date weather information.
Change Month
Greeley in September - FAQ
What are the expected maximum and minimum temperatures in Greeley 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 Greeley during September?
Significant rainfall exceeding 108.1 mm is expected in Greeley during September, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Greeley during September?
The average wind speed in Greeley during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Greeley
Explore the daily rainfall trends and prepare for Greeleys September weather 💧
UV exposure in Greeley during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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