Oxbow Bend
Use the river bend for autumn scenery and patient distant wildlife viewing.
September · Oxbow Bend
What to see and do in Grand Teton in September
Choose a September outing that fits the route, weather and effort involved.
Mormon Row
Combine the historic barns with Teton views; autumn road access and services need their own checks.
September · Mormon Row
Grand Teton weather in September
September’s normal high is 66°F and low is 34°F, with 1.64 inches of precipitation. Moran 5WNW at about 6,805 ft represents the northern valley near Jackson Lake. Mountain trails can be colder and keep snow into summer. These are station averages, not a mountain forecast.
Cooler Hotter
Jan
High24°F
Low1°F
Precip · in2.90
Feb
High30°F
Low4°F
Precip · in2.31
Mar
High39°F
Low12°F
Precip · in2.34
Apr
High46°F
Low21°F
Precip · in2.16
May
High56°F
Low31°F
Precip · in2.36
Jun
High67°F
Low37°F
Precip · in1.75
Jul
High77°F
Low42°F
Precip · in1.02
Aug
High76°F
Low40°F
Precip · in1.28
Sep
High66°F
Low34°F
Precip · in1.64
Oct
High51°F
Low25°F
Precip · in1.92
Nov
High35°F
Low14°F
Precip · in2.61
Dec
High24°F
Low4°F
Precip · in3.10
Grand Teton crowds in September
September averages 564,320 recreation visits, 77% of the peak monthly average in July.
LowestLowModerateHighPeakAverage month: 292,291September
Tips for your September visit
Check the approach before choosing the rest of the day.
AMoose EntranceBMoran EntranceCGranite Canyon Entrance
- Selected main highway
- Selected roads with winter vehicle closures
- Park boundary
Moose Entrance
Teton Park Road normally allows through-driving May through October.
How we built this page.
An independent guide using official data. Not affiliated with or endorsed by the National Park Service.
- Crowds
- 2021–2025 monthly averages. NPS recreation visits, compared with the park’s own busiest month. Visits are not unique visitors or a count of people on a trail.
- Weather
- 1991-2020 climate normals. NOAA’s Moran 5WNW HCN station. These describe typical weather at the station, not every part of the park or a forecast.
- Roads & lodging
- Normal seasonal schedules. NPS guidance and official operator information. Confirm access, hours and availability before you travel.
Historical records and data-quality checks
- Visit history: 1979–2025 NPS monthly recreation visits.
- Weather history: 1911–2025 daily observations, separate from climate normals. We average daily highs and lows and total the rain for each month.
- Complete months only: every day must pass our quality checks for that metric. Missing or incomplete records stay blank; we never interpolate.
- Excluded measurements: flagged, presumed-zero and lagged values. Trace rain counts as zero measurable rainfall.