National Weather Service Forecast for: Casper WY
Issued by: National Weather Service Riverton, WY
Updated: 12:47 am MDT Aug 20, 2026
 
Overnight

Overnight: Mostly clear, with a low around 56. West wind around 6 mph.
Mostly Clear

 Thursday

Thursday: Patchy smoke between 8am and 1pm. Sunny, with a high near 93. West southwest wind 5 to 11 mph.
Patchy Smoke

 Thursday
Night
Thursday Night: Increasing clouds, with a low around 60. Northwest wind 5 to 8 mph becoming east southeast in the evening.
Increasing
Clouds

 Friday

Friday: Mostly sunny and hot, with a high near 97. Light and variable wind becoming north 5 to 9 mph in the morning.
Hot

 Friday
Night
Friday Night: Partly cloudy, with a low around 61. North wind 5 to 10 mph becoming light and variable after midnight.
Partly Cloudy

 Saturday

Saturday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 92. Calm wind becoming southeast 5 to 9 mph in the afternoon.
Mostly Sunny
then Slight
Chance
T-storms
 Saturday
Night
Saturday Night: A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 63. Southeast wind 8 to 11 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Slight Chance
T-storms then
Mostly Cloudy
 Sunday

Sunday: Mostly sunny, with a high near 92. Breezy.
Mostly Sunny
and Breezy

 Sunday
Night
Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 60.
Slight Chance
T-storms then
Mostly Clear
Lo 56 °F Hi 93 °F Lo 60 °F Hi 97 °F Lo 61 °F Hi 92 °F Lo 63 °F Hi 92 °F Lo 60 °F

 

Overnight
 
 Mostly clear, with a low around 56. West wind around 6 mph.
Thursday
 
 Patchy smoke between 8am and 1pm. Sunny, with a high near 93. West southwest wind 5 to 11 mph.
Thursday Night
 
 Increasing clouds, with a low around 60. Northwest wind 5 to 8 mph becoming east southeast in the evening.
Friday
 
 Mostly sunny and hot, with a high near 97. Light and variable wind becoming north 5 to 9 mph in the morning.
Friday Night
 
 Partly cloudy, with a low around 61. North wind 5 to 10 mph becoming light and variable after midnight.
Saturday
 
 A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 92. Calm wind becoming southeast 5 to 9 mph in the afternoon.
Saturday Night
 
 A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 63. Southeast wind 8 to 11 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Sunday
 
 Mostly sunny, with a high near 92. Breezy.
Sunday Night
 
 A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 60.
Monday
 
 A 10 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 57.
Tuesday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Tuesday Night
 
 A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57.
Wednesday
 
 Mostly sunny, with a high near 88.

 

Forecast from NOAA-NWS for Casper WY.