NWS Forecast for: Yellowstone National Park WY Issued by: National Weather Service Riverton, WY Last Update: 6:04 pm MDT Jul 21, 2026

Flood Watch Tonight: Scattered showers and thunderstorms before 4am, then isolated showers between 4am and 5am. Patchy smoke before 11pm. Mostly cloudy, with a low around 47. Southeast wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 50%. Wednesday: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 75. Light and variable wind becoming east northeast 5 to 10 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. Wednesday Night: Showers and possibly a thunderstorm before 9pm, then scattered showers and thunderstorms between 9pm and 3am, then scattered showers after 3am. Low around 46. East wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. Thursday: A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers and possibly a thunderstorm after noon. High near 74. Calm wind becoming west northwest 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. Thursday Night: Partly cloudy, with a low around 46. Calm wind. Friday: Sunny, with a high near 79. Calm wind becoming west southwest 5 to 7 mph in the morning. Winds could gust as high as 23 mph. Friday Night: Partly cloudy, with a low around 48. West southwest wind around 5 mph becoming light and variable after midnight. Saturday: A 10 percent chance of showers and thunderstorms after noon. Sunny, with a high near 79. Saturday Night: Partly cloudy, with a low around 48. Sunday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 79. Sunday Night: Partly cloudy, with a low around 47. Monday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78. Monday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 47. Tuesday: A slight chance of showers and thunderstorms. Sunny, with a high near 78.

Yellowstone National Park WY  44.57°N 110.5°W (Elev. 8340 ft)

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