The Cheyenne Office of the National Weather Service says southeast Wyoming can expect warm, summer-like weather today and tomorrow before the return of wetter weather and possibly some storms towards mid-week.

The agency posted the following on it's website:

Here’s a look at the next five days! A hot start to the week with mostly sunny skies expected! Temperatures cool off towards the end of the week with increased storm chances. Strong storms may be possible on Wednesday and Friday so be sure to check back for updates!

Here is the forecast for Cheyenne:

Juneteenth
Sunny, with a high near 83. West southwest wind 5 to 10 mph becoming south 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Tonight
Mostly clear, with a low around 54. South wind 5 to 15 mph becoming west after midnight.
Tuesday
Mostly sunny, with a high near 80. West wind 10 to 15 mph becoming south southeast in the afternoon.
Tuesday Night
Mostly clear, with a low around 52. South wind 5 to 15 mph becoming north northwest after midnight.
Wednesday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 75. North wind 10 to 15 mph becoming southeast in the afternoon.
Wednesday Night
Showers and thunderstorms likely before 9pm, then showers likely and possibly a thunderstorm between 9pm and midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
A slight chance of rain, then showers and possibly a thunderstorm after noon. High near 70. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 52.
Friday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76.
Friday Night
A slight chance of showers and thunderstorms before midnight. Mostly clear, with a low around 51.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 49.
Sunday
Sunny, with a high near 76.
Here is the Laramie forecast:
Juneteenth
Sunny, with a high near 75. Breezy, with a south southwest wind around 25 mph, with gusts as high as 40 mph.
Tonight
Mostly clear, with a low around 51. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph.
Tuesday
Mostly sunny, with a high near 72. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly clear, with a low around 46. Breezy, with a south wind 15 to 20 mph becoming west 5 to 10 mph after midnight. Winds could gust as high as 30 mph.
Wednesday
A 50 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 68. West northwest wind 5 to 15 mph becoming east southeast in the afternoon.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 47.
Thursday
Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 66. Breezy. Chance of precipitation is 70%.
Thursday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. Breezy.
Friday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 72. Breezy.
Friday Night
Mostly clear, with a low around 44. Breezy.
Saturday
Sunny, with a high near 69. Breezy.
Saturday Night
Mostly clear, with a low around 44. Breezy.
Sunday
Sunny, with a high near 70.