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 31 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.3 °F by the end of September.
Colorado experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 36.1 mm.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
28°/13°
Temperatures
15 km/h
Avg max wind
32 %
Avg humidity
Colorado in September average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  32° | 2  31° | 3 31° | 4  30° | 5  29° | 6 32° | |
| 7 32° | 8 32° | 9 30° | 10 25° | 11  27° | 12 29° | 13 28° |
| 14 25° | 15 27° | 16 28° | 17  27° | 18 29° | 19 27° | 20 26° |
| 21 21° | 22 22° | 23 27° | 24 25° | 25 28° | 26 30° | 27 28° |
| 28 29° | 29 27° | 30 24° |
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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 | Moderate rain at times | 31° /17° | 0.4 mm | 7 | |
| Sept. 3 | Moderate or heavy rain shower | 31° /17° | 1.9 mm | 7 | |
| Sept. 4 | Partly cloudy | 30° /15° | 2.7 mm | 7 | |
| Sept. 5 | Sunny | 29° /14° | 0.3 mm | 7 | |
| Sept. 6 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 7 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 8 | Sunny | 32° /16° | 0 mm | 8 | |
| Sept. 9 | Sunny | 30° /14° | 0.4 mm | 7 | |
| Sept. 10 | Partly cloudy | 25° /14° | 2.6 mm | 6 | |
| Sept. 11 | Patchy rain possible | 27° /13° | 1.5 mm | 6 | |
| Sept. 12 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 28° /13° | 0.1 mm | 7 | |
| Sept. 14 | Moderate rain at times | 25° /13° | 0.8 mm | 6 | |
| Sept. 15 | Sunny | 27° /13° | 1.5 mm | 7 | |
| Sept. 16 | Partly cloudy | 28° /11° | 0 mm | 7 | |
| Sept. 17 | Overcast | 27° /11° | 0 mm | 6 | |
| Sept. 18 | Sunny | 29° /11° | 0 mm | 7 | |
| Sept. 19 | Partly cloudy | 27° /13° | 0 mm | 7 | |
| Sept. 20 | Sunny | 26° /11° | 0.3 mm | 6 | |
| Sept. 21 | Sunny | 21° /9° | 7 mm | 5 | |
| Sept. 22 | Sunny | 22° /8° | 14.4 mm | 6 | |
| Sept. 23 | Overcast | 27° /8° | 0 mm | 6 | |
| Sept. 24 | Partly cloudy | 25° /10° | 0 mm | 7 | |
| Sept. 25 | Sunny | 28° /9° | 0 mm | 7 | |
| Sept. 26 | Sunny | 30° /11° | 0 mm | 8 | |
| Sept. 27 | Sunny | 28° /13° | 0.1 mm | 7 | |
| Sept. 28 | Cloudy | 29° /12° | 0 mm | 7 | |
| Sept. 29 | Sunny | 27° /11° | 1.7 mm | 6 | |
| Sept. 30 | Partly cloudy | 24° /10° | 0.4 mm | 6 | |
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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 28° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Colorado during September?
In September, Colorado can expect light to moderate rainfall, totaling 36.1 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
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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