Grand Teton Forecast Wednesday – Thursday July 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.

A dry Wednesday; showers return on Thursday.

Wednesday: Mostly sunny and warm, with a chance of a brief isolated shower in the afternoon. Generally light winds. Highs in the mid 80’s.

Thursday: Variable cloudiness. Chance of showers late morning, then a good chance for showers and thunderstorms in the afternoon. Some thunderstorms may be strong with wind gusts over 30 mph. High temperatures in the mid 80’s.

Smoke forecast: Heaviest smoke concentrations remain over northwestern NV, eastern OR, northern ID, and western MT. For Grand Teton, noticeable smoke returns on Wednesday with a moderate reduction to visibility. Smoke should again decrease on Thursday.

Extended Outlook:

Friday – Monday: Mostly sunny and very warm. Highs in the mid to upper 80’s each day. The upcoming Pioneer Days this weekend look to be sunny, dry, and very warm. Afternoon showers may return next Tuesday.

Expect above normal temperatures for the remainder of July and into August. The latter part of July may not be as dry as the first half of the month.

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