Colorado (Denver)
September
Weather in Colorado for September 2025
Your guide to Colorado weather in September - trends and predictions
In general, the average temperature in Colorado at the beginning of September is 29.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 28.6 °F by the end of September.
With an average of 3 rainy days, Colorado experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
27°/11°
Temperatures
15 km/h
Avg max wind
35 %
Avg humidity
Colorado in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  32° | 2 32° | 3 32° | 4  30° | 5 24° | 6  29° | 7 30° |
| 8 31° | 9 31° | 10  26° | 11  25° | 12 27° | 13  26° | 14 26° |
| 15 26° | 16 26° | 17 27° | 18 27° | 19 24° | 20  27° | 21 22° |
| 22 19° | 23 25° | 24 24° | 25 28° | 26 30° | 27 29° | 28 31° |
| 29 30° | 30 28° |
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Temperatures trend during September in Colorado
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 | Cloudy | 32° /16° | 0 mm | 8 | |
| Sept. 2 | Cloudy | 32° /17° | 0 mm | 8 | |
| Sept. 3 | Cloudy | 32° /18° | 1.2 mm | 7 | |
| Sept. 4 | Partly cloudy | 30° /16° | 3.6 mm | 7 | |
| Sept. 5 | Partly cloudy | 24° /13° | 0.5 mm | 6 | |
| Sept. 6 | Sunny | 29° /13° | 0 mm | 8 | |
| Sept. 7 | Sunny | 30° /14° | 0 mm | 8 | |
| Sept. 8 | Sunny | 31° /16° | 0 mm | 8 | |
| Sept. 9 | Partly cloudy | 31° /15° | 0.1 mm | 8 | |
| Sept. 10 | Patchy light rain with thunder | 26° /16° | 1.2 mm | 6 | |
| Sept. 11 | Thundery outbreaks possible | 25° /14° | 2.9 mm | 6 | |
| Sept. 12 | Sunny | 27° /13° | 0 mm | 7 | |
| Sept. 13 | Overcast | 26° /13° | 0 mm | 7 | |
| Sept. 14 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 26° /13° | 0.1 mm | 6 | |
| Sept. 16 | Partly cloudy | 26° /10° | 0.1 mm | 6 | |
| Sept. 17 | Cloudy | 27° /11° | 0 mm | 6 | |
| Sept. 18 | Cloudy | 27° /10° | 0.1 mm | 7 | |
| Sept. 19 | Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 20 | Patchy rain possible | 27° /11° | 0.1 mm | 6 | |
| Sept. 21 | Patchy rain possible | 22° /9° | 9.2 mm | 5 | |
| Sept. 22 | Sunny | 19° /7° | 27.4 mm | 5 | |
| Sept. 23 | Overcast | 25° /6° | 0 mm | 6 | |
| Sept. 24 | Partly cloudy | 24° /11° | 0 mm | 7 | |
| Sept. 25 | Sunny | 28° /9° | 0 mm | 7 | |
| Sept. 26 | Sunny | 30° /11° | 0 mm | 8 | |
| Sept. 27 | Sunny | 29° /15° | 0 mm | 7 | |
| Sept. 28 | Partly cloudy | 31° /11° | 0 mm | 8 | |
| Sept. 29 | Sunny | 30° /12° | 0 mm | 8 | |
| Sept. 30 | Partly cloudy | 28° /11° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Colorado 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 Colorado forecast closer to your planned date for the most up-to-date weather information.
Colorado in September - FAQ
What are the expected maximum and minimum temperatures in Colorado during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Colorado during September?
Rainfall in Colorado during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 3 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Colorado during September?
The average wind speed in Colorado during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Colorado
Explore the daily rainfall trends and prepare for Colorados September weather 💧
UV exposure in Colorado during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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