Grand Teton Forecast Thursday – Friday July 22-23

  • 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.

Showers today, then a drying and warming trend. Smoke returns on Friday.

Thursday: Variable cloudiness. A good chance for more than one round of showers and thunderstorms in the afternoon and early evening. Some thunderstorms may be strong with wind gusts over 30 mph. High temperatures in the mid 80’s.

Friday: Mostly sunny and warm. Highs in the mid 80’s. The afternoon rain showers should stay south of the Park. Light to moderate breezes in the afternoon.

Smoke forecast: Our smoke concentrations depend almost entirely on the upper level winds: when they are from the south or southwest, the smoke goes north into Montana. A westerly wind aloft brings smoke into the Tetons. For Grand Teton, there will be decreasing smoke on Thursday. By Thursday afternoon, little or no smoke will be apparent. On Friday the smoke returns with moderate impact to visibility.

Extended Outlook:

Saturday – Sunday: Mostly sunny and very warm. Highs in the upper 80’s. The upcoming Pioneer Days this weekend look to be sunny, dry, and very warm.

Monday – Tuesday: Mostly sunny and hot. Highs around 90 deg. Afternoon showers may return next Wednesday.

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.

Leave a Reply