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Week of cooler temps, rain to follow pleasant fall weather Monday

Above average temperatures are brought to Cheyenne courtesy an upper level high today.

Interstate 25 north out of Cheyenne at 6:45 a.m. Sept. 18, 2023. (Wyoming Department of Transportation)

CHEYENNE, Wyo. — There is no case of the Mondays for Cheyenne weather. In fact, today is the only day this week without a chance for rain.

The National Weather Service in Cheyenne has forecast a sunny start to the work week with a high of 79. That’s thanks to an upper-level high that will help provide a mild afternoon with slightly above-average temperatures in the region. This afternoon, the ridge will flatten out, and that will help the breeze pick up, meteorologists said in the forecast discussion. That could lead to elevated fire weather concerns.

Tonight will see the low drop to around 52 under partly cloudy skies.


Tuesday will start off bright and be mostly sunny through the morning as the mercury climbs again to 77. There is a 20% chance for thunderstorms in the afternoon after 3 p.m. Winds will continue to come from the west-northwest at 15 mph. The chance for storms lasts through 9 p.m. before skies clear overnight and the low falls to around 48.

Wednesday will follow a similar pattern. A sunny morning will help get the high back to 74 degrees. There’s a 30% chance for afternoon showers, and that will last through about 9 p.m. Then there’s a 20% chance for showers between 9 and midnight, according to the forecast.

Thursday will follow the pattern: Mostly sunny morning will get the high to 75, and then the afternoon will bring storm chances. There’s a 30% chance for rain after noon, and that will persist into the evening and overnight. The low is forecast at 46.


Friday also is likely to see storm chances along with some wind. Winds will continue into Saturday along with those rain chances.

More on the forecast is available from the National Weather Service in Cheyenne.