September is a good month at Channel Islands — it ranks 9th of the twelve here. Expect about 23% fewer visitors than July, the park's peak — 27,744 visits on average. Days run around 74°F by afternoon and 60°F at night, with 12.3 hours of daylight.
September against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| September (this page) | Good | 27,744 | −23% | 74°F | 60°F | — | 12.3 h |
| January (best) | Excellent | 12,484 | −65% | 66°F | 46°F | — | 10.1 h |
| July (peak crowds) | Good | 35,866 | peak | 73°F | 61°F | — | 14.2 h |
Weather figures are for the Ventura Harbor area (mainland visitor center) — the Oxnard Ventura Co AP 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 Channel Islands?
It is a reasonable month — the park has stronger ones, but the records don't argue against it. September ranks 9 of 12 at Channel Islands on crowds, weather, daylight, and access together.
How crowded is Channel Islands in September?
About 27,744 recreation visits on average — 23% below July, the park's peak.
How warm is Channel Islands in September?
Average highs around 74°F and lows around 60°F at the Oxnard Ventura Co AP station.
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