Cheyenne (WY)
September
Weather in Cheyenne, Wyoming for September 2026
Your guide to Cheyenne weather in September - trends and predictions
So far, September 2026 in Cheyenne is slightly warmer than the historical average by 0.7 °F.
The forecast for the upcoming days in Cheyenne predicts a temperature of 24.1 °F, which is slightly above the historical average.
In general, the average temperature in Cheyenne at the beginning of September is 26.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23 °F by the end of September.
Cheyenne experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 111.8 mm.
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Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
24°/10°
Temperatures
26 km/h
Avg max wind
46 %
Avg humidity
Cheyenne Weather September
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Temperatures trend during September in Cheyenne
See the weather trend as well as the moving average line
September weather in Cheyenne day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 2 |  Patchy rain possible | 28° /13° | 0.6 mm | 7 | |
| Sept. 3 | Sunny | 28° /15° | 0.3 mm | 7 | |
| Sept. 4 | Sunny | 28° /13° | 1.4 mm | 7 | |
| Sept. 5 |  Partly cloudy | 22° /12° | 0.1 mm | 5 | |
| Sept. 6 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 7 | Partly cloudy | 27° /13° | 3.7 mm | 5 | |
| Sept. 8 |  Overcast | 27° /14° | 0.5 mm | 6 | |
| Sept. 9 | Patchy rain possible | 27° /12° | 0.3 mm | 7 | |
| Sept. 10 | Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 11 | Light rain shower | 27° /14° | 1.5 mm | 5 | |
| Sept. 12 | Partly cloudy | 26° /11° | 0 mm | 6 | |
| Sept. 13 | Overcast | 26° /11° | 1.4 mm | 4 | |
| Sept. 14 | Sunny | 26° /12° | 0 mm | 5 | |
| Sept. 15 | Patchy rain possible | 25° /10° | 0.3 mm | 7 | |
| Sept. 16 | Partly cloudy | 24° /10° | 0.7 mm | 4 | |
| Sept. 17 |  Moderate or heavy rain shower | 20° /11° | 15.9 mm | 3 | |
| Sept. 18 | Overcast | 22° /9° | 1.5 mm | 3 | |
| Sept. 19 | Sunny | 23° /8° | 0.8 mm | 5 | |
| Sept. 20 | Sunny | 24° /8° | 1.2 mm | 6 | |
| Sept. 21 | Moderate or heavy rain shower | 20° /9° | 7 mm | 5 | |
| Sept. 22 |  Heavy rain | 18° /6° | 44.1 mm | 4 | |
| Sept. 23 | Overcast | 21° /14° | 0 mm | 4.7 | |
| Sept. 24 | Overcast | 22° /14° | 0 mm | 6.4 | |
| Sept. 25 | Partly cloudy | 24° /12° | 0 mm | 6 | |
| Sept. 26 | Sunny | 26° /15° | 0.1 mm | 6.2 | |
| Sept. 27 | Overcast | 26° /16° | 0 mm | 7 | |
| Sept. 28 | Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 29 | Sunny | 18° /7° | 0 mm | 5 | |
| Sept. 30 | Sunny | 21° /7° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Cheyenne 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 Cheyenne forecast closer to your planned date for the most up-to-date weather information.
Change Month
Cheyenne in September - FAQ
What are the expected maximum and minimum temperatures in Cheyenne during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Cheyenne during September?
Significant rainfall exceeding 111.8 mm is expected in Cheyenne during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cheyenne during September?
The average wind speed in Cheyenne during September is 26 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Cheyenne
Explore the daily rainfall trends and prepare for Cheyennes September weather 💧
Typically, Cheyenne has 7 rainy days in September with a total of 111.8 mm of rainfall.
UV exposure in Cheyenne during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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