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United States weather

Weather in Fort Collins, Colorado for September 2025

Your guide to Fort Collins weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Fort Collins is slightly cooler than the historical average by -1.8 °F.

  • The forecast for the next days in Fort Collins predicts temperatures to be around 27 °F, close to the historical average.

  • In general, the average temperature in Fort Collins at the beginning of September is 28.4 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 28.4 °F by the end of September.

    • Rain 🌧️

  • Fort Collins experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 60 mm.

    • More

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

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/12°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
37 %
Avg humidity

Fort Collins Weather September

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

Temperatures trend during September in Fort Collins

See the weather trend as well as the moving average line

September weather in Fort Collins day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 30° /14° 0 mm 7
Sept. 2 Overcast
Overcast
 30° /14° 0.2 mm 7
Sept. 3 Patchy light drizzle
Patchy light drizzle
 31° /15° 1.8 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 29° /13° 1.9 mm 7
Sept. 5 Partly cloudy
Partly cloudy
 23° /11° 0.2 mm 6
Sept. 6 Sunny
Sunny
 27° /10° 0 mm 7
Sept. 7 Sunny
Sunny
 29° /13° 0.1 mm 7
Sept. 8 Sunny
Sunny
 30° /14° 0 mm 7
Sept. 9 Cloudy
Cloudy
 29° /14° 0.8 mm 6
Sept. 10 Partly cloudy
Partly cloudy
 26° /12° 2 mm 6
Sept. 11 Fog
Fog
 25° /13° 1.2 mm 6
Sept. 12 Sunny
Sunny
 26° /11° 0 mm 6
Sept. 13 Cloudy
Cloudy
 25° /11° 0 mm 6
Sept. 14 Overcast
Overcast
 24° /11° 0 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 25° /11° 0 mm 6
Sept. 16 Patchy rain possible
Patchy rain possible
 27° /13° 3 mm 1.4
Sept. 17 Partly cloudy
Partly cloudy
 23° /12° 0 mm 1.3
Sept. 18 Overcast
Overcast
 20° /11° 0 mm 1.5
Sept. 19 Sunny
Sunny
 27° /7° 0 mm 1.7
Sept. 20 Partly cloudy
Partly cloudy
 29° /14° 0 mm 1.4
Sept. 21 Patchy rain possible
Patchy rain possible
 26° /15° 0.1 mm 0
Sept. 22 Sunny
Sunny
 28° /15° 0 mm 6
Sept. 23 Sunny
Sunny
 30° /12° 0 mm 6
Sept. 24 Sunny
Sunny
 32° /14° 0 mm 6
Sept. 25 Sunny
Sunny
 32° /15° 0 mm 6
Sept. 26 Sunny
Sunny
 30° /15° 0 mm 6
Sept. 27 Sunny
Sunny
 30° /15° 0 mm 6
Sept. 28 Sunny
Sunny
 29° /15° 0 mm 6
Sept. 29 Patchy rain possible
Patchy rain possible
 21° /12° 1.7 mm 4
Sept. 30 Patchy light drizzle
Patchy light drizzle
 25° /10° 0.4 mm 6
Next
Important Notice
Our weather forecast for Fort Collins 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 Fort Collins forecast closer to your planned date for the most up-to-date weather information.
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Fort Collins in September - FAQ

What are the expected maximum and minimum temperatures in Fort Collins during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Fort Collins during September?
Moderate rainfall is anticipated in Fort Collins during September, with a total of 60 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Fort Collins during September?
The average wind speed in Fort Collins during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Fort Collins

Explore the daily rainfall trends and prepare for Fort Collinss September weather 💧

UV exposure in Fort Collins 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 Fort Collins?

Get accurate weather forecasts for Fort Collins, located at latitude 40.585 and longitude -105.084. Stay updated with localized weather information tailored for Fort Collins.

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