Paradise meadows
Leaf color and seed heads replace most flowers as autumn develops; the emphasis shifts from flowers to autumn scenery.
September · Paradise meadows
What to see and do in Mount Rainier in September
Choose a September outing that fits the route, weather and effort involved.
Longmire
A lower-elevation fallback as seasonal roads and facilities wind down.
September · Longmire
Mount Rainier weather in September
September’s normal high is 69°F and low is 42°F, with 3.50 inches of precipitation. The Longmire station sits inside the park at about 2,762 ft, near Longmire and the National Park Inn. These normals describe that lower district. Paradise and Sunrise are much higher and can be colder and snowier. Use a forecast for your planned stops; these monthly values cannot establish road openings or trail snow conditions.
Cooler Hotter
Jan
High37°F
Low26°F
Precip · in11.45
Feb
High40°F
Low26°F
Precip · in8.60
Mar
High45°F
Low28°F
Precip · in7.55
Apr
High51°F
Low31°F
Precip · in5.93
May
High60°F
Low37°F
Precip · in4.75
Jun
High66°F
Low42°F
Precip · in3.70
Jul
High75°F
Low46°F
Precip · in1.22
Aug
High76°F
Low46°F
Precip · in1.49
Sep
High69°F
Low42°F
Precip · in3.50
Oct
High55°F
Low35°F
Precip · in9.00
Nov
High43°F
Low29°F
Precip · in12.96
Dec
High36°F
Low25°F
Precip · in12.42
Mount Rainier crowds in September
September averages 234,962 recreation visits, 56% of the peak monthly average in July.
LowestLowModerateHighPeakAverage month: 137,035September
Tips for your September visit
Check the approach before choosing the rest of the day.
ANisqually EntranceBWhite River EntranceCStevens Canyon EntranceDCarbon River EntranceEMowich Lake Entrance
- Park boundary
Nisqually Entrance
Nisqually is the normal winter vehicle approach; Paradise has a weather-dependent gate schedule.
How we built this page.
An independent guide using official data. Not affiliated with or endorsed by the National Park Service.
- Crowds
- 2021–2025 monthly averages. NPS recreation visits, compared with the park’s own busiest month. Visits are not unique visitors or a count of people on a trail.
- Weather
- 1991-2020 climate normals. NOAA’s Longmire Rainier NPS, WA station. These describe typical weather at the station, not every part of the park or a forecast.
- Roads & lodging
- Normal seasonal schedules. NPS guidance and official operator information. Confirm access, hours and availability before you travel.
Historical records and data-quality checks
- Visit history: 1979–2025 NPS monthly recreation visits.
- Weather history: 1978–2025 daily observations, separate from climate normals. We average daily highs and lows and total the rain for each month.
- Complete months only: every day must pass our quality checks for that metric. Missing or incomplete records stay blank; we never interpolate.
- Excluded measurements: flagged, presumed-zero and lagged values. Trace rain counts as zero measurable rainfall.