Colorado (Denver)
September
Weather in Colorado for September 2026
Your guide to Colorado weather in September - trends and predictions
Flood Watch - See hour by hour.
So far, September 2026 in Colorado is slightly warmer than the historical average by 1.1 °F.
The forecast for the coming days of September 2026 predicts a temperature of 25.1 °F , which is warmer than usual.
In general, the average temperature in Colorado at the beginning of September is 30.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.6 °F by the end of September.
Colorado experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 43.8 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
27°/13°
Temperatures
15 km/h
Avg max wind
36 %
Avg humidity
Colorado Weather September
Move between months or click on a day
What’s the Weather Like in Colorado This September?
Discover the average temperatures and weather trends across Colorado’s cities this September.
Temperatures trend during September in Colorado
See the weather trend as well as the moving average line
September weather in Colorado day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Cloudy | 31° /16° | 0 mm | 7 | |
| Sept. 2 |  Sunny | 31° /17° | 0.3 mm | 8 | |
| Sept. 3 | Sunny | 31° /17° | 1.2 mm | 8 | |
| Sept. 4 | Sunny | 31° /16° | 1.8 mm | 8 | |
| Sept. 5 | Sunny | 28° /15° | 0.2 mm | 7 | |
| Sept. 6 | Sunny | 31° /15° | 0.4 mm | 8 | |
| Sept. 7 | Sunny | 32° /16° | 0 mm | 7 | |
| Sept. 8 | Sunny | 32° /16° | 0.3 mm | 8 | |
| Sept. 9 |  Overcast | 29° /14° | 0.3 mm | 7 | |
| Sept. 10 |  Partly cloudy | 27° /14° | 3.3 mm | 7 | |
| Sept. 11 |  Patchy rain possible | 28° /14° | 1.8 mm | 6 | |
| Sept. 12 | Overcast | 28° /13° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 28° /13° | 1 mm | 7 | |
| Sept. 14 |  Moderate rain at times | 26° /14° | 1.7 mm | 5 | |
| Sept. 15 | Partly cloudy | 27° /12° | 1 mm | 7 | |
| Sept. 16 | Partly cloudy | 28° /12° | 4.8 mm | 6 | |
| Sept. 17 | Overcast | 26° /12° | 1.1 mm | 5 | |
| Sept. 18 | Sunny | 27° /12° | 0.9 mm | 6 | |
| Sept. 19 | Partly cloudy | 27° /12° | 0.3 mm | 7 | |
| Sept. 20 | Patchy rain possible | 26° /11° | 0.4 mm | 6 | |
| Sept. 21 | Overcast | 23° /9° | 4.7 mm | 6 | |
| Sept. 22 | Sunny | 23° /9° | 10.2 mm | 6 | |
| Sept. 23 | Overcast | 24° /9° | 1.3 mm | 5 | |
| Sept. 24 | Partly cloudy | 24° /11° | 1.1 mm | 6 | |
| Sept. 25 | Sunny | 27° /10° | 0.7 mm | 6 | |
| Sept. 26 | Sunny | 29° /11° | 0 mm | 7 | |
| Sept. 27 | Sunny | 28° /13° | 0.1 mm | 6 | |
| Sept. 28 | Cloudy | 27° /12° | 0.3 mm | 6 | |
| Sept. 29 | Overcast | 23° /17° | 0 mm | 4.8 | |
| Sept. 30 | Overcast | 21° /16° | 0.1 mm | 3.7 | |
| Next | |||||
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.
Change Month
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 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 43.8 mm across approximately 6 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 💧
Typically, Colorado has 6 rainy days in September with a total of 43.8 mm of rainfall.
UV exposure in Colorado during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Counties in Colorado
Select a county for an accurate weather forecast
Adams CountyAlamosa CountyArapahoe CountyArchuleta CountyBoulder CountyChaffee CountyDenver CountyEagle CountyEl Paso CountyGarfield CountyJefferson CountyLa Plata CountyLake CountyLarimer CountyMesa CountyMontrose CountyOuray CountyPitkin CountyRoutt CountySan Juan CountySan Miguel CountySummit CountyWeld County
Top locations in Colorado
Select a location for an accurate weather forecast
More Locations Quick links
More Colorado weather pages
You are here
Where is Colorado?Get accurate weather forecasts for Colorado, located at latitude 39.739 and longitude -104.985. Stay updated with localized weather information tailored for Colorado.
Found a mistake?
We appreciate your attention to details. Tell us here.