National Weather Service Forecast for: Casper WY
Issued by: National Weather Service Riverton, WY
Updated: 8:17 pm MDT Jun 18, 2026
 
Tonight

Tonight: Partly cloudy, with a low around 48. North wind 5 to 14 mph becoming east northeast after midnight. Winds could gust as high as 23 mph.
Partly Cloudy

 Juneteenth

Juneteenth: Mostly sunny, with a high near 82. East northeast wind 5 to 10 mph.
Mostly Sunny

 Friday
Night
Friday Night: Partly cloudy, with a low around 53. Breezy, with an east wind 13 to 18 mph becoming light east southeast after midnight. Winds could gust as high as 29 mph.
Partly Cloudy
and Breezy

 Saturday

Saturday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 89. Light and variable wind becoming west northwest 9 to 14 mph in the afternoon. Winds could gust as high as 24 mph.
Partly Sunny
then Chance
T-storms
 Saturday
Night
Saturday Night: A 40 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 52. Northwest wind 5 to 14 mph becoming west southwest after midnight. Winds could gust as high as 24 mph.
Chance
Showers then
Partly Cloudy
 Sunday

Sunday: A chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 78. West southwest wind 7 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Showers
Likely

 Sunday
Night
Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. North northeast wind 5 to 11 mph.
Slight Chance
T-storms then
Partly Cloudy
 Monday

Monday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 80.
Mostly Sunny
then Chance
T-storms
 Monday
Night
Monday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. Breezy.
Slight Chance
T-storms and
Breezy then
Partly Cloudy
Lo 48 °F Hi 82 °F Lo 53 °F Hi 89 °F Lo 52 °F Hi 78 °F Lo 48 °F Hi 80 °F Lo 48 °F

 

Tonight
 
 Partly cloudy, with a low around 48. North wind 5 to 14 mph becoming east northeast after midnight. Winds could gust as high as 23 mph.
Juneteenth
 
 Mostly sunny, with a high near 82. East northeast wind 5 to 10 mph.
Friday Night
 
 Partly cloudy, with a low around 53. Breezy, with an east wind 13 to 18 mph becoming light east southeast after midnight. Winds could gust as high as 29 mph.
Saturday
 
 A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 89. Light and variable wind becoming west northwest 9 to 14 mph in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
 
 A 40 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 52. Northwest wind 5 to 14 mph becoming west southwest after midnight. Winds could gust as high as 24 mph.
Sunday
 
 A chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 78. West southwest wind 7 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Sunday Night
 
 A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. North northeast wind 5 to 11 mph.
Monday
 
 A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 80.
Monday Night
 
 A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. Breezy.
Tuesday
 
 Mostly sunny, with a high near 80.
Tuesday Night
 
 Mostly clear, with a low around 50.
Wednesday
 
 Sunny, with a high near 86.
Wednesday Night
 
 Partly cloudy, with a low around 52.
Thursday
 
 A slight chance of showers and thunderstorms. Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Casper WY.