How Crowded Is Lowell National Historical Park in September?

September runs about 0.5× Lowell National Historical Park's average month, which makes it a very quiet month here — roughly 4% of the park's yearly visitors come in September.

In a typical September the park sees about 15,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 10th-busiest of the park's twelve months, sitting between the July peak (4.8×) and the December low (0.3×).

On our Best Time to Visit score September rates 81/100 ("Excellent") — the single best-rated month at Lowell, balancing crowds against weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 76°F and an overnight low around 52°F, with about 3.9" of precipitation.

That average of about 64°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 60% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.3 hours of daylight in September to explore — between the 8.9-hour midwinter low and the 15.1-hour summer high.

Park-wide, 2024 drew 264,456 recreation visits, up 3.2% from 256,303 in 2023.

Across the past decade overall visitation has eased about 52.5%, so September may feel a touch quieter than it once did.