Grand Teton Forecast Thursday – Friday 16-17 September

  • 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.

Dry and seasonably warm weather continues. Windy afternoons, with elevated fire danger the next few days. Big changes coming early next week.

Thursday: Partly sunny in the morning with variable cloudiness in the afternoon. Quite breezy in the afternoon with winds gusting 25-30 mph. Afternoon showers should stay north of the park, up in Yellowstone. Highs in the lower 70’s.

Friday: Partly to mostly sunny. Windy in the afternoon with winds gusting 25-32 mph. Highs in low to mid 70’s.

Smoke forecast: Light to moderate smoke returns to the Park though on Thursday, primarily from Idaho and Montana fires. There will be more day to day variability in the smoke as weather patterns become more active and, thankfully, the individual fires are somewhat smaller. Some rain and snow to our north and west early next week will help too.

Extended Outlook:

Saturday: Partly to mostly sunny. Very breezy again in the afternoon. Slightly warmer with highs in the mid 70’s.

Sunday: Partly to mostly sunny, but increasing cloudiness in the afternoon. Highs around 70 deg.

Monday: Cloudy with rain, rain showers and a possible thunderstorm. Snow levels 9000 feet and falling to 7500 feet by evening. Snow mixing with rain into the valley elevations by evening. Much colder with highs in the mid to upper 40’s. Rain and snow showers overnight. Mostly snow above 7000 feet.

Tuesday: Snow showers in the early morning give way to gradual clearing with a few lingering rain and snow showers in the afternoon. Expect a hard freeze by Tuesday morning with lows in the low to mid 20’s. Highs in the low to mid 50’s.

Wednesday: Partly cloudy and somewhat milder. Highs in the low 60’s after another hard freeze Wednesday morning.

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