September is an excellent month at Lake Clark — it ranks first of the twelve here. Expect about 70% fewer visitors than July, the park's peak — 1,820 visits on average. Days run around 57°F by afternoon and 42°F at night, with 12.7 hours of daylight.
September against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| September (this page) | Excellent | 1,820 | −70% | 57°F | 42°F | 0.3" | 12.7 h |
| July (peak crowds) | Good | 6,005 | peak | 69°F | 52°F | 0" | 18.1 h |
Weather figures are for the Port Alsworth area — the Port Alsworth 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 Lake Clark?
Yes — it is the park's best-scoring month. September ranks 1 of 12 at Lake Clark on crowds, weather, daylight, and access together.
How crowded is Lake Clark in September?
About 1,820 recreation visits on average — 70% below July, the park's peak.
How warm is Lake Clark in September?
Average highs around 57°F and lows around 42°F at the Port Alsworth station.
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