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Fort Collins (CO)
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United States weather

Weather in Fort Collins, Colorado for September 2026

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

    Temperatures

  • So far, September 2026 in Fort Collins is slightly warmer than the historical average by 1.2 °F.

  • The forecast for the next days in Fort Collins predicts temperatures to be around 26 °F, close to the historical average.

  • In general, the average temperature in Fort Collins at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.3 °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 45.4 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
25°/12°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
41 %
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
Sunny
30°
3
Patchy light drizzle
31°
4
Sunny
29°
5
Partly cloudy
25°
6
Sunny
27°
7
Sunny
29°
8
Sunny
29°
9
Overcast
28°
10
Partly cloudy
27°
11
Fog
26°
12
Sunny
26°
13
Cloudy
27°
14
Overcast
26°
15
Partly cloudy
25°
16
Sunny
26°
17
Partly cloudy
24°
18
Overcast
25°
19
Thundery outbreaks possible
25°
20
Patchy light drizzle
25°
21
Overcast
23°
22
Partly cloudy
21°
23
Overcast
22°
24
Partly cloudy
22°
25
Sunny
25°
26
Sunny
29°
27
Overcast
29°
28
Overcast
24°
29
Overcast
23°
30
Overcast
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 Sunny
Sunny
 30° /14° 0.3 mm 7
Sept. 3 Patchy light drizzle
Patchy light drizzle
 31° /15° 1.4 mm 7
Sept. 4 Sunny
Sunny
 29° /13° 1.4 mm 8
Sept. 5 Partly cloudy
Partly cloudy
 25° /12° 0.1 mm 7
Sept. 6 Sunny
Sunny
 27° /11° 0.9 mm 7
Sept. 7 Sunny
Sunny
 29° /14° 0.3 mm 6
Sept. 8 Sunny
Sunny
 29° /14° 0.3 mm 7
Sept. 9 Overcast
Overcast
 28° /13° 0.6 mm 7
Sept. 10 Partly cloudy
Partly cloudy
 27° /12° 1.5 mm 7
Sept. 11 Fog
Fog
 26° /13° 0.9 mm 5
Sept. 12 Sunny
Sunny
 26° /11° 0 mm 6
Sept. 13 Cloudy
Cloudy
 27° /12° 0.1 mm 7
Sept. 14 Overcast
Overcast
 26° /13° 0 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 25° /11° 0 mm 7
Sept. 16 Sunny
Sunny
 26° /11° 0.3 mm 5
Sept. 17 Partly cloudy
Partly cloudy
 24° /12° 0 mm 4
Sept. 18 Overcast
Overcast
 25° /11° 0.5 mm 4
Sept. 19 Thundery outbreaks possible
Thundery outbreaks possible
 25° /11° 1.6 mm 5
Sept. 20 Patchy light drizzle
Patchy light drizzle
 25° /10° 1 mm 6
Sept. 21 Overcast
Overcast
 23° /10° 3.4 mm 5
Sept. 22 Partly cloudy
Partly cloudy
 21° /9° 20.5 mm 5
Sept. 23 Overcast
Overcast
 22° /9° 3.7 mm 4
Sept. 24 Partly cloudy
Partly cloudy
 22° /9° 0 mm 5
Sept. 25 Sunny
Sunny
 25° /10° 0.1 mm 6
Sept. 26 Sunny
Sunny
 29° /15° 0 mm 6.3
Sept. 27 Overcast
Overcast
 29° /16° 0.2 mm 6.3
Sept. 28 Overcast
Overcast
 24° /17° 0.1 mm 4.1
Sept. 29 Overcast
Overcast
 23° /17° 0.1 mm 4.7
Sept. 30 Overcast
Overcast
 25° /15° 0 mm 6.3
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 25° 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?
In September, Fort Collins can expect light to moderate rainfall, totaling 45.4 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.

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 💧
Typically, Fort Collins has 7 rainy days in September with a total of 45.4 mm of rainfall.

UV exposure in Fort Collins during September

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

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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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