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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: 9:32 am MDT Sep 25, 2026
 
Today

Today: Sunny, with a high near 66. Southwest wind 5 to 8 mph, with gusts as high as 23 mph.
Sunny

 Tonight

Tonight: Partly cloudy, with a low around 35. South wind around 7 mph, with gusts as high as 26 mph.
Partly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 57. Southwest wind 5 to 10 mph, with gusts as high as 28 mph.
Mostly Sunny

 Saturday
Night
Saturday Night: Increasing clouds, with a low around 35. Southwest wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 22 mph.
Increasing
Clouds
 Sunday

Sunday: Partly sunny, with a high near 62. Calm wind becoming southwest 5 to 8 mph in the afternoon. Winds could gust as high as 22 mph.
Partly Sunny

 Sunday
Night
Sunday Night: A 50 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 36. West southwest wind around 5 mph becoming calm in the evening.
Mostly Cloudy
then Chance
Showers
 Monday

Monday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 58. Calm wind becoming west southwest around 5 mph in the afternoon. Chance of precipitation is 50%.
Chance
Showers
 Monday
Night
Monday Night: A 10 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 30.
Slight Chance
T-storms then
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 59.
Sunny
Hi 66 °F Lo 35 °F Hi 57 °F Lo 35 °F Hi 62 °F Lo 36 °F Hi 58 °F Lo 30 °F Hi 59 °F

 

Today
 
 Sunny, with a high near 66. Southwest wind 5 to 8 mph, with gusts as high as 23 mph.
Tonight
 
 Partly cloudy, with a low around 35. South wind around 7 mph, with gusts as high as 26 mph.
Saturday
 
 Mostly sunny, with a high near 57. Southwest wind 5 to 10 mph, with gusts as high as 28 mph.
Saturday Night
 
 Increasing clouds, with a low around 35. Southwest wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 22 mph.
Sunday
 
 Partly sunny, with a high near 62. Calm wind becoming southwest 5 to 8 mph in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
 
 A 50 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 36. West southwest wind around 5 mph becoming calm in the evening.
Monday
 
 A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 58. Calm wind becoming west southwest around 5 mph in the afternoon. Chance of precipitation is 50%.
Monday Night
 
 A 10 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 30.
Tuesday
 
 Sunny, with a high near 59.
Tuesday Night
 
 Mostly clear, with a low around 31.
Wednesday
 
 Sunny, with a high near 59.
Wednesday Night
 
 Mostly clear, with a low around 31.
Thursday
 
 Sunny, with a high near 59.

 

Forecast from NOAA-NWS for Old Faithful WY.

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






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