September is an excellent month at Lassen Volcanic — it ranks 4th of the twelve here. Expect about 53% fewer visitors than July, the park's peak — 50,271 visits on average. Days run around 72°F by afternoon and 41°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) | Excellent | 50,271 | −53% | 72°F | 41°F | — | 12.4 h |
| May (best) | Excellent | 33,897 | −69% | 61°F | 35°F | — | 14.4 h |
| July (peak crowds) | Good | 107,728 | peak | 79°F | 46°F | — | 14.8 h |
Weather figures are for the Manzanita Lake area (5,900 ft) — the Manzanita Lake 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 Lassen Volcanic?
Yes — it is one of the best months of the year here. September ranks 4 of 12 at Lassen Volcanic on crowds, weather, daylight, and access together.
How crowded is Lassen Volcanic in September?
About 50,271 recreation visits on average — 53% below July, the park's peak.
How warm is Lassen Volcanic in September?
Average highs around 72°F and lows around 41°F at the Manzanita Lake station.
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