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Yellowstone National Park, CA Weather Forecast
Wx Discussion - Wx Hazards - Wx Aviation
NWS Forecast for Old Faithful WY
National Weather Service Forecast for: Old Faithful WY
Issued by: National Weather Service Riverton, WY
Updated: 4:32 am MDT Sep 17, 2026
 
Today

Today: Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 66. Light and variable wind becoming south southwest around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers

 Tonight

Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 39. Light south southeast wind. Chance of precipitation is 60%.
Chance
Showers then
Showers
Likely
 Friday

Friday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after noon. High near 65. Calm wind becoming south southwest around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Chance
Showers then
Showers
 Friday
Night
Friday Night: Showers and possibly a thunderstorm. Low around 35. Calm wind. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers

 Saturday

Saturday: Showers likely, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 58. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely

 Saturday
Night
Saturday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 33. Light west wind. Chance of precipitation is 50%.
Chance
Showers then
Slight Chance
Showers
 Sunday

Sunday: A 10 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 63. Light west northwest wind.
Partly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: Mostly clear, with a low around 33.
Mostly Clear

 Monday

Monday: Sunny, with a high near 67.
Sunny
Hi 66 °F Lo 39 °F Hi 65 °F Lo 35 °F Hi 58 °F Lo 33 °F Hi 63 °F Lo 33 °F Hi 67 °F

 

Today
 
 Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 66. Light and variable wind becoming south southwest around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 39. Light south southeast wind. Chance of precipitation is 60%.
Friday
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after noon. High near 65. Calm wind becoming south southwest around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
 
 Showers and possibly a thunderstorm. Low around 35. Calm wind. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
 
 Showers likely, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 58. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
 A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 33. Light west wind. Chance of precipitation is 50%.
Sunday
 
 A 10 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 63. Light west northwest wind.
Sunday Night
 
 Mostly clear, with a low around 33.
Monday
 
 Sunny, with a high near 67.
Monday Night
 
 Mostly clear, with a low around 33.
Tuesday
 
 Sunny, with a high near 67.
Tuesday Night
 
 Mostly clear, with a low around 34.
Wednesday
 
 Sunny, with a high near 67.

 

Forecast from NOAA-NWS for Old Faithful WY.

Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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