Larimer County (Fort Collins)
September
Weather in Larimer County, Colorado for September 2027
Your guide to Larimer County weather in September - trends and predictions
In general, the average temperature in Larimer County at the beginning of September is 28.2 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25.4 °C by the end of September.
With an average of 4 rainy days, Larimer County experiences minimal rainfall in September.
Is September a good time to visit Larimer County? check out the best time to travel to Larimer County page.
✨ Is September a good time to visit Larimer County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
26°/12°
Temperatures
19 km/h
Avg max wind
42 %
Avg humidity
Larimer County Weather September
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Temperatures trend during September in Larimer County
See the weather trend as well as the moving average line
September weather in Larimer County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /14° | 0 mm | 7 | |
| Sept. 2 | Sunny | 29° /15° | 0.3 mm | 7 | |
| Sept. 3 |  Patchy light drizzle | 30° /15° | 1.4 mm | 7 | |
| Sept. 4 |  Patchy rain possible | 29° /14° | 1.4 mm | 7.9 | |
| Sept. 5 |  Partly cloudy | 24° /13° | 0.1 mm | 7 | |
| Sept. 6 | Sunny | 27° /11° | 0.9 mm | 7 | |
| Sept. 7 | Sunny | 29° /14° | 0.3 mm | 6 | |
| Sept. 8 | Sunny | 29° /14° | 0.3 mm | 7 | |
| Sept. 9 |  Overcast | 28° /14° | 0.6 mm | 7 | |
| Sept. 10 | Patchy rain possible | 26° /13° | 1.5 mm | 7 | |
| Sept. 11 |  Fog | 26° /14° | 0.9 mm | 5 | |
| Sept. 12 | Sunny | 26° /11° | 0 mm | 6 | |
| Sept. 13 |  Cloudy | 27° /12° | 0.1 mm | 7 | |
| Sept. 14 | Overcast | 26° /13° | 0 mm | 5 | |
| Sept. 15 | Partly cloudy | 25° /11° | 0 mm | 6.9 | |
| Sept. 16 | Sunny | 26° /11° | 0.3 mm | 5 | |
| Sept. 17 | Partly cloudy | 24° /13° | 0 mm | 4 | |
| Sept. 18 | Overcast | 25° /11° | 0.5 mm | 4 | |
| Sept. 19 |  Thundery outbreaks possible | 25° /11° | 1.6 mm | 5 | |
| Sept. 20 | Patchy light drizzle | 25° /11° | 1 mm | 6 | |
| Sept. 21 | Light rain | 23° /10° | 3.4 mm | 5 | |
| Sept. 22 |  Moderate rain | 21° /10° | 20.5 mm | 5 | |
| Sept. 23 | Light rain | 22° /9° | 3.7 mm | 4 | |
| Sept. 24 | Partly cloudy | 22° /10° | 0 mm | 5 | |
| Sept. 25 | Sunny | 25° /10° | 0.1 mm | 6 | |
| Sept. 26 | Partly cloudy | 28° /11° | 0 mm | 5.9 | |
| Sept. 27 | Sunny | 27° /14° | 0 mm | 5 | |
| Sept. 28 | Sunny | 26° /13° | 0 mm | 5 | |
| Sept. 29 | Sunny | 26° /13° | 0.2 mm | 5 | |
| Sept. 30 | Patchy light drizzle | 24° /11° | 0.2 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Larimer County 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 Larimer County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Larimer County in September - FAQ
What are the expected maximum and minimum temperatures in Larimer County 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 Larimer County during September?
In September, Larimer County can expect light to moderate rainfall, totaling 39.5 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Larimer County during September?
The average wind speed in Larimer County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Larimer County
Explore the daily rainfall trends and prepare for Larimer Countys September weather 💧
Typically, Larimer County has 4 rainy days in September with a total of 39.5 mm of rainfall.
UV exposure in Larimer County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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