Casper (WY)
September
Weather in Casper, Wyoming for September 2027
Your guide to Casper weather in September - trends and predictions
In general, the average temperature in Casper at the beginning of September is 26 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.3 °C by the end of September.
With an average of 3 rainy days, Casper experiences minimal rainfall in September.
Is September a good time to visit Casper? check out the best time to travel to Casper page.
✨ Is September a good time to visit Casper? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
24°/10°
Temperatures
26 km/h
Avg max wind
42 %
Avg humidity
Casper Weather September
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Temperatures trend during September in Casper
See the weather trend as well as the moving average line
September weather in Casper day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 26° /12° | 0.4 mm | 7 | |
| Sept. 2 | Sunny | 27° /13° | 0 mm | 7.6 | |
| Sept. 3 | Sunny | 26° /13° | 0 mm | 7.5 | |
| Sept. 4 | Sunny | 28° /13° | 0 mm | 7.4 | |
| Sept. 5 |  Overcast | 24° /13° | 0 mm | 6 | |
| Sept. 6 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 7 |  Thundery outbreaks possible | 26° /12° | 0 mm | 5 | |
| Sept. 8 |  Partly cloudy | 26° /12° | 0 mm | 7.1 | |
| Sept. 9 |  Cloudy | 28° /10° | 0 mm | 7 | |
| Sept. 10 | Sunny | 29° /12° | 0 mm | 6.9 | |
| Sept. 11 |  Patchy rain possible | 28° /12° | 0.1 mm | 6 | |
| Sept. 12 | Overcast | 26° /10° | 0 mm | 5 | |
| Sept. 13 | Overcast | 25° /10° | 0.5 mm | 5 | |
| Sept. 14 | Overcast | 24° /9° | 0.2 mm | 6 | |
| Sept. 15 | Partly cloudy | 25° /8° | 0 mm | 6 | |
| Sept. 16 | Patchy rain possible | 24° /11° | 0.6 mm | 4 | |
| Sept. 17 |  Moderate rain | 17° /11° | 18 mm | 3 | |
| Sept. 18 |  Light rain | 21° /10° | 5 mm | 6 | |
| Sept. 19 | Patchy rain possible | 23° /8° | 1.6 mm | 5 | |
| Sept. 20 | Patchy rain possible | 22° /8° | 1.5 mm | 5 | |
| Sept. 21 | Overcast | 19° /8° | 0 mm | 5 | |
| Sept. 22 | Sunny | 21° /7° | 0.4 mm | 5 | |
| Sept. 23 | Cloudy | 20° /8° | 0 mm | 3 | |
| Sept. 24 | Sunny | 22° /8° | 0 mm | 5 | |
| Sept. 25 | Sunny | 25° /9° | 0.2 mm | 5.5 | |
| Sept. 26 | Sunny | 27° /12° | 0 mm | 5.4 | |
| Sept. 27 | Sunny | 25° /9° | 0.1 mm | 5 | |
| Sept. 28 | Partly cloudy | 24° /11° | 0.2 mm | 5 | |
| Sept. 29 | Sunny | 25° /10° | 0 mm | 5.1 | |
| Sept. 30 | Sunny | 21° /7° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Casper 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 Casper forecast closer to your planned date for the most up-to-date weather information.
Change Month
Casper in September - FAQ
What are the expected maximum and minimum temperatures in Casper 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 Casper during September?
In September, Casper can expect light to moderate rainfall, totaling 28.8 mm across approximately 3 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Casper during September?
The average wind speed in Casper during September is 26 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Casper
Explore the daily rainfall trends and prepare for Caspers September weather 💧
Typically, Casper has 3 rainy days in September with a total of 28.8 mm of rainfall.
UV exposure in Casper during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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