Mount Rainier National Park in September

Mount Rainier National Park · crowd + weather almanac

September crowd level moderate

about 196,000 visits in a typical September

The 4th-busiest month of the year · median of 2016–2025 official NPS counts

September is the 4th-busiest month of the year at Mount Rainier National Park: about 196,000 recreation visits in a typical September (13% of the year's traffic, and 52% of what the peak month, July, sees). Crowds are middling — noticeably lighter than peak season. Weather-wise, September days at the Rainier Paradise Rs, WA station typically top out around 57°F with nights near 41°F, and about 4.4 inches of precipitation falls over the month.

Typical September: 195,791 recreation visits (median 2016–2025); the range across those years ran 168,751 (2025) to 295,701 (2022).
Busier than 8 of the other 11 months.
1991–2020 September normals at Rainier Paradise Rs, WA: high 57°F, low 41°F, 4.43 in precipitation.

Typical (median) monthly recreation visits at Mount Rainier National Park, 2016–2025. September highlighted. Source: NPS Visitor Use Statistics.

September weather (1991–2020 normals)

Typical daytime high	57°F
Typical overnight low	41°F
Precipitation (monthly normal)	4.43 in
Measured at	Rainier Paradise Rs, WA (USC00456898), 0.4 mi from the park reference point, elev. 5,427 ft

Every month at Mount Rainier

Month	Typical visits	Crowds	High / Low	Precip
January	23,775	quietest stretch	34°F / 24°F	17.2 in
February	16,497	quietest stretch	34°F / 23°F	12.9 in
March	27,922	quietest stretch	36°F / 24°F	13.2 in
April	29,516	quietest stretch	40°F / 26°F	8.3 in
May	94,992	quiet	48°F / 33°F	5.1 in
June	219,463	moderate	54°F / 37°F	3.8 in
July	377,222	busiest stretch	62°F / 44°F	1.4 in
August	370,623	busiest stretch	64°F / 45°F	1.6 in
September	195,791	moderate	57°F / 41°F	4.4 in
October	105,185	quiet	46°F / 33°F	11.2 in
November	33,377	quietest stretch	37°F / 26°F	18.2 in
December	25,467	quietest stretch	33°F / 22°F	18.9 in

Official NPS page for Mount Rainier →