September is a good month at Grand Teton — it ranks 5th of the twelve here. Expect about 23% fewer visitors than July, the park's peak — 564,320 visits on average. Days run around 68°F by afternoon and 35°F at night, with 12.4 hours of daylight.
September against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| September (this page) | Good | 564,320 | −23% | 68°F | 35°F | — | 12.4 h |
| May (best) | Excellent | 305,741 | −58% | 60°F | 32°F | — | 14.7 h |
| July (peak crowds) | Good | 732,380 | peak | 79°F | 43°F | — | 15.1 h |
Weather figures are for the Moose area — the Moose 1 NNE station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is September a good time to visit Grand Teton?
Yes — a solid month, if not the very best. September ranks 5 of 12 at Grand Teton on crowds, weather, daylight, and access together.
How crowded is Grand Teton in September?
About 564,320 recreation visits on average — 23% below July, the park's peak.
How warm is Grand Teton in September?
Average highs around 68°F and lows around 35°F at the Moose 1 NNE station.
← Grand Teton in August · All months at Grand Teton · Grand Teton in October →