Grand Teton Forecast Saturday – Sunday August 21-22

  • Short-term forecast, emphasizing weather parameters most important to visitors in the Jenny Lake / String Lake / Leigh Lake region
  • Animations of expected weather radar updated daily.
    • Other weather parameters (snow, wind, etc.) added when they may be significant.
    • For orientation, animation maps show Wyoming and a small portion of the surrounding states.
  • Temperature graphic is for the Airport. Subtract a couple of degrees for String Lake and 3-5 degrees if a visitor asks about Colter Bay.
  • The wind gusts forecasts are usually (in the summer) a reasonable forecast for average sustained wind speeds at 9,000 – 11,000 feet for backcountry hikers.
  • For those with access to Grand Teton Park Radios: Channel 16 is NOAA Weather Radio
  • Click here for access to the NOAA smoke-forecasting site.
  • Click here for an animation of smoke concentration over the northwest U.S. for the next two days.

One more storm – then summer resumes…

Final batch of rain mixed with snow and embedded thunderstorms for the high mountains Saturday afternoon, ending Sunday morning. Saturday night will be challenging camping in the high backcountry sites.

Saturday: Sunny in the morning, then increasing clouds with showers and isolated thunderstorms developing early afternoon and continuing through the night. Snow levels at night down to 9000 feet. Southwest winds gusting 22-26 mph in the afternoon. Highs in the mid to upper 60’s.

Sunday: Cloudy, with showers and drizzle early morning. Precipitation ending by mid-morning. Becoming partly sunny after lunchtime. West winds gusting 20-25 mph in the afternoon. Highs in the mid to upper 60’s.

Smoke forecast: The smoke will wax and wane in intensity, driven by the storm systems and local rains. Heaviest smoke for the next couple of days over the Tetons will be Saturday afternoon through Sunday morning.

Extended Outlook:

Monday: Partly to mostly sunny. Chance of afternoon showers. Highs in the mid 70’s.

Tuesday – Friday: Partly to mostly sunny. Highs in the mid 70’s.

Outlook through early September: Drier than normal with temperatures at or slightly above normal.

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