Wyoming (Cheyenne)
September
Weather in Wyoming for September 2025
Your guide to Wyoming weather in September - trends and predictions
In general, the average temperature in Wyoming at the beginning of September is 26.7 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 26.3 °F by the end of September.
Wyoming experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 148.9 mm.
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Temperatures
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
25°/11°
Temperatures
27 km/h
Avg max wind
37 %
Avg humidity
Wyoming Weather September
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What’s the Weather Like in Wyoming This September?
Discover the average temperatures and weather trends across Wyoming’s cities this September.
Temperatures trend during September in Wyoming
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September weather in Wyoming day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /15° | 0 mm | 7 | |
| Sept. 2 |  Patchy rain possible | 29° /13° | 0.4 mm | 6 | |
| Sept. 3 |  Patchy light drizzle | 30° /18° | 0.8 mm | 7 | |
| Sept. 4 | Light rain shower | 25° /13° | 4.1 mm | 6 | |
| Sept. 5 |  Partly cloudy | 21° /12° | 0 mm | 6 | |
| Sept. 6 | Sunny | 26° /14° | 0 mm | 7 | |
| Sept. 7 | Partly cloudy | 28° /14° | 0 mm | 7 | |
| Sept. 8 | Sunny | 28° /15° | 0 mm | 7 | |
| Sept. 9 | Patchy rain possible | 29° /17° | 1 mm | 6 | |
| Sept. 10 | Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 11 | Light rain shower | 26° /15° | 0.6 mm | 6 | |
| Sept. 12 | Partly cloudy | 28° /12° | 0 mm | 7 | |
| Sept. 13 |  Overcast | 24° /11° | 0 mm | 5 | |
| Sept. 14 | Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 15 | Patchy rain possible | 27° /13° | 0.8 mm | 6 | |
| Sept. 16 | Partly cloudy | 27° /14° | 1.4 mm | 7 | |
| Sept. 17 |  Moderate or heavy rain shower | 23° /10° | 6 mm | 5 | |
| Sept. 18 | Overcast | 22° /6° | 0 mm | 5 | |
| Sept. 19 | Sunny | 24° /7° | 0 mm | 6 | |
| Sept. 20 | Sunny | 27° /8° | 0 mm | 7 | |
| Sept. 21 | Moderate or heavy rain shower | 15° /8° | 8.4 mm | 4 | |
| Sept. 22 |  Heavy rain | 8° /1° | 125.4 mm | 2 | |
| Sept. 23 | Overcast | 22° /3° | 0 mm | 5 | |
| Sept. 24 | Partly cloudy | 22° /9° | 0 mm | 6 | |
| Sept. 25 | Sunny | 27° /8° | 0 mm | 7 | |
| Sept. 26 | Sunny | 30° /11° | 0 mm | 8 | |
| Sept. 27 | Partly cloudy | 27° /13° | 0 mm | 7 | |
| Sept. 28 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 29 | Partly cloudy | 29° /10° | 0 mm | 7 | |
| Sept. 30 | Partly cloudy | 21° /6° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Wyoming 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 Wyoming forecast closer to your planned date for the most up-to-date weather information.
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Wyoming in September - FAQ
What are the expected maximum and minimum temperatures in Wyoming during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Wyoming during September?
Significant rainfall exceeding 148.9 mm is expected in Wyoming during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Wyoming during September?
The average wind speed in Wyoming during September is 27 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Wyoming
Explore the daily rainfall trends and prepare for Wyomings September weather 💧
UV exposure in Wyoming during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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