National Weather Service Forecast for: Old Faithful WY
Issued by: National Weather Service Riverton, WY
Updated: 6:02 pm MDT May 26, 2026
 
Tonight

Tonight: A 50 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 37. Southeast wind 5 to 8 mph becoming calm after midnight.
Chance
Showers then
Partly Cloudy
 Wednesday

Wednesday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Light south southeast wind.
Sunny then
Slight Chance
T-storms
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 39. Light east southeast wind.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 77. Calm wind becoming south southeast around 5 mph.
Sunny

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 40. Calm wind.
Partly Cloudy

 Friday

Friday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Calm wind becoming south around 5 mph.
Mostly Sunny
then Slight
Chance
T-storms
 Friday
Night
Friday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 38. Calm wind. Chance of precipitation is 20%.
Slight Chance
T-storms then
Slight Chance
Showers
 Saturday

Saturday: Showers and possibly a thunderstorm. High near 56. Chance of precipitation is 80%.
Showers

 Saturday
Night
Saturday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 34. Chance of precipitation is 70%.
Showers
Likely then
Chance
Showers
Lo 37 °F Hi 73 °F Lo 39 °F Hi 77 °F Lo 40 °F Hi 73 °F Lo 38 °F Hi 56 °F Lo 34 °F

 

Tonight
 
 A 50 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 37. Southeast wind 5 to 8 mph becoming calm after midnight.
Wednesday
 
 A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Light south southeast wind.
Wednesday Night
 
 Mostly clear, with a low around 39. Light east southeast wind.
Thursday
 
 Sunny, with a high near 77. Calm wind becoming south southeast around 5 mph.
Thursday Night
 
 Partly cloudy, with a low around 40. Calm wind.
Friday
 
 A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Calm wind becoming south around 5 mph.
Friday Night
 
 A slight chance of showers and thunderstorms. Partly cloudy, with a low around 38. Calm wind. Chance of precipitation is 20%.
Saturday
 
 Showers and possibly a thunderstorm. High near 56. Chance of precipitation is 80%.
Saturday Night
 
 Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 34. Chance of precipitation is 70%.
Sunday
 
 Showers likely, with thunderstorms also possible after noon. Partly sunny, with a high near 57. Chance of precipitation is 60%.
Sunday Night
 
 A slight chance of showers and thunderstorms. Partly cloudy, with a low around 33.
Monday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 63.
Monday Night
 
 A slight chance of showers and thunderstorms. Partly cloudy, with a low around 34.
Tuesday
 
 A slight chance of showers and thunderstorms. Sunny, with a high near 68.

 

Forecast from NOAA-NWS for Old Faithful WY.