Grand Teton National Park in September
Grand Teton National Park · crowd + weather almanac
September crowd level
busy
about 569,000 visits in a
typical September
The 4th-busiest month of the year ·
median of 2016–2025 official NPS counts
September is the 4th-busiest month of the year at Grand Teton National Park: about 569,000 recreation visits in a typical September (16% of the year's traffic, and 74% of what the peak month, July, sees). This is a busy month, though short of the summer-peak crush. Weather-wise, September days at the Moose, WY station typically top out around 71°F with nights near 34°F, and about 1.6 inches of precipitation falls over the month.
- Typical September: 568,963 recreation visits (median 2016–2025); the range across those years ran 441,995 (2022) to 617,970 (2025).
- Busier than 8 of the other 11 months.
- 1991–2020 September normals at Moose, WY: high 71°F, low 34°F, 1.57 in precipitation, 0.3 in snow.
September weather (1991–2020 normals)
| Typical daytime high | 71°F |
|---|---|
| Typical overnight low | 34°F |
| Precipitation (monthly normal) | 1.57 in |
| Snowfall (monthly normal) | 0.3 in |
| Measured at | Moose, WY (USC00486428), 0.1 mi from the park reference point, elev. 6,444 ft |
Every month at Grand Teton
| Month | Typical visits | Crowds | High / Low | Precip |
|---|---|---|---|---|
| January | 52,998 | quietest stretch | 27°F / 1°F | 2.6 in |
| February | 53,425 | quietest stretch | 32°F / 6°F | 2.2 in |
| March | 59,499 | quietest stretch | 42°F / 15°F | 1.8 in |
| April | 63,745 | quietest stretch | 50°F / 24°F | 1.8 in |
| May | 285,423 | moderate | 62°F / 33°F | 2.0 in |
| June | 626,248 | busy | 71°F / 39°F | 1.8 in |
| July | 765,526 | busiest stretch | 82°F / 44°F | 1.1 in |
| August | 701,866 | busiest stretch | 81°F / 42°F | 1.2 in |
| September | 568,963 | busy | 71°F / 34°F | 1.6 in |
| October | 224,238 | quiet | 56°F / 25°F | 1.7 in |
| November | 49,344 | quietest stretch | 39°F / 15°F | 2.3 in |
| December | 49,799 | quietest stretch | 28°F / 4°F | 2.8 in |