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United States weather

Weather in Denver, Colorado for September 2025

Your guide to Denver weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Denver is cooler than usual, with temperatures averaging 26.7 °F, this is -2.8 °F below the typical seasonal average.

  • The forecast for the next days in Denver predicts temperatures to be around 28 °F, close to the historical average.

  • In general, the average temperature in Denver at the beginning of September is 30.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 28.7 °F by the end of September.

    • Rain 🌧️

  • Denver experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 36.1 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/13°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
32 %
Avg humidity

Denver Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Cloudy
31°
2
Sunny
31°
3
Moderate or heavy rain shower
30°
4
Partly cloudy
31°
5
Sunny
27°
6
Sunny
30°
7
Sunny
31°
8
Sunny
32°
9
Overcast
29°
10
Partly cloudy
26°
11
Patchy rain possible
27°
12
Sunny
28°
13
Partly cloudy
27°
14
Patchy rain possible
26°
15
Sunny
30°
16
Partly cloudy
21°
17
Sunny
26°
18
Sunny
27°
19
Sunny
29°
20
Patchy rain possible
26°
21
Sunny
29°
22
Sunny
30°
23
Sunny
31°
24
Sunny
33°
25
Patchy rain possible
31°
26
Patchy rain possible
29°
27
Sunny
28°
28
Cloudy
29°
29
Sunny
27°
30
Partly cloudy
24°

Temperatures trend during September in Denver

See the weather trend as well as the moving average line

September weather in Denver day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Cloudy
Cloudy
 31° /16° 0 mm 7
Sept. 2 Sunny
Sunny
 31° /16° 0.3 mm 7
Sept. 3 Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /16° 1.5 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 31° /15° 2.1 mm 7
Sept. 5 Sunny
Sunny
 27° /14° 0.2 mm 7
Sept. 6 Sunny
Sunny
 30° /13° 0 mm 8
Sept. 7 Sunny
Sunny
 31° /15° 0 mm 8
Sept. 8 Sunny
Sunny
 32° /16° 0 mm 8
Sept. 9 Overcast
Overcast
 29° /14° 0.3 mm 7
Sept. 10 Partly cloudy
Partly cloudy
 26° /14° 4 mm 6
Sept. 11 Patchy rain possible
Patchy rain possible
 27° /13° 2.1 mm 6
Sept. 12 Sunny
Sunny
 28° /13° 0 mm 7
Sept. 13 Partly cloudy
Partly cloudy
 27° /12° 1.2 mm 7
Sept. 14 Patchy rain possible
Patchy rain possible
 26° /11° 2.7 mm 1.6
Sept. 15 Sunny
Sunny
 30° /12° 0 mm 1.6
Sept. 16 Partly cloudy
Partly cloudy
 21° /15° 0 mm 1.5
Sept. 17 Sunny
Sunny
 26° /14° 0.1 mm 1.6
Sept. 18 Sunny
Sunny
 27° /14° 0 mm 0
Sept. 19 Sunny
Sunny
 29° /17° 0 mm 6
Sept. 20 Patchy rain possible
Patchy rain possible
 26° /19° 0.2 mm 5
Sept. 21 Sunny
Sunny
 29° /17° 0 mm 6
Sept. 22 Sunny
Sunny
 30° /19° 0 mm 6
Sept. 23 Sunny
Sunny
 31° /19° 0 mm 6
Sept. 24 Sunny
Sunny
 33° /20° 0 mm 7
Sept. 25 Patchy rain possible
Patchy rain possible
 31° /23° 0.2 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 29° /19° 1 mm 5
Sept. 27 Sunny
Sunny
 28° /13° 0.1 mm 7
Sept. 28 Cloudy
Cloudy
 29° /12° 0 mm 7
Sept. 29 Sunny
Sunny
 27° /11° 1.7 mm 6
Sept. 30 Partly cloudy
Partly cloudy
 24° /10° 0.4 mm 6
Next
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
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Denver in September - FAQ

What are the expected maximum and minimum temperatures in Denver 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 Denver during September?
In September, Denver 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 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 💧

UV exposure in Denver during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Denver?

Get accurate weather forecasts for Denver, located at latitude 39.739 and longitude -104.985. Stay updated with localized weather information tailored for Denver.

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