Denver (CO)
September
Weather in Denver, Colorado for September 2026
Your guide to Denver weather in September - trends and predictions
So far, September 2026 in Denver is slightly warmer than the historical average by 1.1 °F.
Expect cooler weather in the next days in Denver with the forecast suggesting a temperature of 28.4 °F, lower than the historical average.
In general, the average temperature in Denver at the beginning of September is 30.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.6 °F by the end of September.
Denver experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 43.8 mm.
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Temperatures
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
27°/13°
Temperatures
15 km/h
Avg max wind
36 %
Avg humidity
Denver Weather September
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Temperatures trend during September in Denver
See the weather trend as well as the moving average line
September weather in Denver day by day
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| 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 | Sunny | 33° /20° | 0.3 mm | 7.7 | |
| Sept. 12 | Sunny | 28° /19° | 1.7 mm | 7.4 | |
| Sept. 13 | Sunny | 34° /19° | 0.1 mm | 8.2 | |
| Sept. 14 | Overcast | 29° /17° | 0 mm | 3.9 | |
| Sept. 15 |  Patchy rain possible | 21° /15° | 3.2 mm | 5 | |
| Sept. 16 | Overcast | 27° /15° | 1.5 mm | 6 | |
| Sept. 17 | Overcast | 27° /16° | 1.3 mm | 6 | |
| Sept. 18 | Sunny | 27° /18° | 0 mm | 7 | |
| Sept. 19 | Sunny | 30° /18° | 0 mm | 7 | |
| Sept. 20 | Overcast | 26° /21° | 0 mm | 6 | |
| Sept. 21 | Sunny | 30° /19° | 0 mm | 7 | |
| Sept. 22 | Sunny | 28° /18° | 0 mm | 7 | |
| Sept. 23 | Sunny | 29° /17° | 0 mm | 7 | |
| Sept. 24 | Partly cloudy | 24° /10° | 0.5 mm | 6 | |
| Sept. 25 | Sunny | 27° /9° | 0 mm | 7 | |
| Sept. 26 | Sunny | 29° /10° | 0 mm | 7 | |
| Sept. 27 | Sunny | 28° /13° | 0.1 mm | 7 | |
| Sept. 28 | Cloudy | 28° /11° | 0 mm | 7 | |
| Sept. 29 | Sunny | 26° /11° | 1.4 mm | 6 | |
| Sept. 30 | Cloudy | 24° /10° | 0.7 mm | 5 | |
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Important Notice
Our weather forecast for Denver 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 Denver forecast closer to your planned date for the most up-to-date weather information.
Change Month
Denver in September - FAQ
What are the expected maximum and minimum temperatures in Denver 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 Denver during September?
In September, Denver 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 Denver during September?
The average wind speed in Denver during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Denver
Explore the daily rainfall trends and prepare for Denvers September weather 💧
Typically, Denver has 6 rainy days in September with a total of 43.8 mm of rainfall.
UV exposure in Denver during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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