Cheyenne Weather in September
With daytime temperatures of 23°C (73°F) and nighttime lows of 7°C (45°F), September in Cheyenne brings high temperatures during the day. The perfect weather makes it an appealing time to visit.
Rainfall in Cheyenne in September
Historically, approximately 8 days this month are expected to have rain, averaging 42 mm (1.7 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Cheyenne in September
The perfect temperature in Cheyenne in September makes it a solid month to visit, with 23°C (73°F) during the day and 7°C (45°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to 7°C (45°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Cheyenne in September
With approximately 270 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Cheyenne.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Cheyenne's climate page.
Cheyenne Temperature in September
Min Temperature
7°C (45°F)
Max Temperature
23°C (73°F)
Chance of Rain
28%
Precipitation
42 mm (1.7 in)
Rainy days
8 days
Humidity
52%
Sunshine
270 hours
Percentage Sunshine
70%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cheyenne typically drop from around 26°C (79°F) at the start of September to approximately 21°C (70°F) by the end. Nights are cool, with lows typically ranging from 5°C (41°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Cheyenne in September
Browse day-by-day weather records for Cheyenne spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cheyenne historical weather extremes in September
Based on weather observations in Cheyenne between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 5, 2022, with a maximum of 35°C (95°F).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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unpleasant
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What to Wear in Cheyenne in September
For Cheyenne in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Cheyenne in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Cheyenne's climate page.
Temperature Rainfall Sunshine Humidity
See the full Cheyenne climate overview or explore weather in the United States of America.
