Month guide
Best national parks to visit in September
September might be the best all-around month in the national parks. Crowds thin after Labor Day, the high country is still open, aspens start to turn, and the canyon parks cool off.
Short answer
In September, go to Rocky Mountain, Glacier, Grand Canyon, North Cascades, Crater Lake, Bryce Canyon, Great Basin, or Acadia. NOAA normals put September highs near 70F at Estes Park and 76F on the Grand Canyon's South Rim.
How the September picks were chosen
- Average daily highs at the park's NOAA station land in a comfortable hiking range for September, not a heat or cold extreme.
- September falls inside the park's own best season, or close to it, so the trip is not fighting the calendar.
- Main roads and visitor areas are typically open, with any seasonal closures called out below.
- Every number comes from NOAA's 1991-2020 climate normals, with the station named, so you can check the source.
Recommended parks
Each pick links to the full park guide with season tables, logistics, packing, and route context.
Aspen gold and the elk rutRocky Mountain
- Best for
- Bear Lake corridor, Trail Ridge Road, and Moraine Park elk
- Watch
- Timed-entry reservations typically run into October. Check the current window.
Estes Park averages 70F highs and 39F lows in September, when aspens turn in the second half of the month and the elk rut fills the meadows.
September by the numbers
- Avg high
- 70F
- Avg low
- 39F
- Precip
- 1.7 in
- Snow
- 0.5 in
NOAA station ESTES PARK 3 SSE (USC00052761), Estes Park, the east side gateway (gateway station).
Pack for Rocky Mountain in September
After Labor DayGlacier
- Best for
- Going-to-the-Sun Road, Lake McDonald, and quieter trails
- Watch
- Early snow can close Logan Pass for days at a time. Keep a west-side backup plan.
West Glacier averages 68F highs and 41F lows in September. Crowds fall off after Labor Day while Going-to-the-Sun Road usually stays open.
September by the numbers
- Avg high
- 68F
- Avg low
- 41F
- Precip
- 2.0 in
NOAA station W GLACIER (USC00248809), West Glacier and Lake McDonald.
Pack for Glacier in September
The canyon coolsGrand Canyon
- Best for
- South Rim viewpoints and inner-canyon hikes with an early start
- Watch
- Monsoon storms can linger into September. Get off exposed rims when lightning starts.
The South Rim averages 76F highs and 44F lows in September, while Phantom Ranch at the river still averages 95F.
September by the numbers
- Avg high
- 76F
- Avg low
- 44F
- Precip
- 1.5 in
NOAA station GRAND CANYON NP 2 (USC00023596), the South Rim, Grand Canyon Village.
Pack for Grand Canyon in September
Late-season alpineNorth Cascades
- Best for
- Cascade Pass, Maple Pass area, and Diablo Lake
- Watch
- Rain returns as the month goes on. Newhalem averages 3.6 inches of rain in September.
Newhalem averages 71F highs and 50F lows in September, the last month the high passes are reliably clear.
September by the numbers
- Avg high
- 71F
- Avg low
- 50F
- Precip
- 3.6 in
NOAA station NEWHALEM (USC00455840), Newhalem on the Skagit River.
Pack for North Cascades in September
The last snow-free weeksCrater Lake
- Best for
- Rim Drive, Garfield Peak, and Wizard Island views
- Watch
- Rim Drive can close with early storms. Check road status the morning you go.
Park headquarters averages 63F highs and 37F lows in September, with the first snow, 1.8 inches on average for the month, usually arriving late.
September by the numbers
- Avg high
- 63F
- Avg low
- 37F
- Precip
- 1.9 in
- Snow
- 1.8 in
NOAA station CRATER LAKE NPS HQ (USC00351946), park headquarters below the rim.
Pack for Crater Lake in September
Crisp hoodoo hikesBryce Canyon
- Best for
- Navajo Loop, Fairyland Loop, and star parties
- Watch
- Mornings are cold at this elevation. Start in layers and shed them on the climb out.
Park headquarters averages 70F highs and 42F lows in September, ideal for long loops below the rim.
September by the numbers
- Avg high
- 70F
- Avg low
- 42F
- Precip
- 1.8 in
NOAA station BRYCE CANYON NP HQRS (USC00421008), the rim near park headquarters.
Pack for Bryce Canyon in September
Bristlecones and dark skiesGreat Basin
- Best for
- Wheeler Peak, Lehman Caves, and stargazing
- Watch
- The campgrounds on the scenic drive sit far higher and run much colder than the visitor center.
Lehman Caves averages 73F highs and 48F lows in September, and the park's summer season still has the scenic drive open.
September by the numbers
- Avg high
- 73F
- Avg low
- 48F
- Precip
- 1.1 in
NOAA station GREAT BASIN NP (USC00263340), Lehman Caves and the lower Wheeler Peak road.
Pack for Great Basin in September
Before the leaf peepersAcadia
- Best for
- Ocean Path, Jordan Pond, and carriage roads
- Watch
- Cadillac summit vehicle reservations apply for sunrise. Book ahead.
Park headquarters averages 71F highs and 53F lows in September: warm days and cool nights before October foliage crowds.
September by the numbers
- Avg high
- 71F
- Avg low
- 53F
- Precip
- 4.2 in
NOAA station ACADIA NP (USC00170100), Mount Desert Island, at park headquarters.
Pack for Acadia in SeptemberWhat to pack for the national parks in September
Built from the NOAA averages for the parks above, so it covers the whole spread, from the coldest morning to the warmest afternoon on this list.
A warm layer for mornings
The coldest pick, Crater Lake, averages 37F lows in September. A light puffy or fleece covers sunrise starts.
Layers for a big daily swing
Grand Canyon swings from about 44F at dawn to 76F in the afternoon. Dress in layers you can peel off on the trail.
Sun cover and a water plan
Grand Canyon averages 76F highs in September. Carry more water than feels necessary and cover up from the sun.
A real rain shell
Acadia averages 4.2 inches of precipitation in September. A waterproof shell is not optional there.
September at every national park, by the numbers
Average September highs, lows, and precipitation for the 61 national parks with a usable NOAA station, warmest first. "Best season" marks parks whose own peak window includes September. Tap a park for its full guide, or a pack link for a September packing list.
| Park | High | Low | Precip | Snow | Best season | Plan |
|---|---|---|---|---|---|---|
| Warm: average highs 75F and up | ||||||
| Death Valley | 108F | 79F | 0.2 in | Yes | Pack list | |
| Joshua Tree | 97F | 69F | 0.3 in | Yes | Pack list | |
| Saguarogateway station | 95F | 70F | 1.3 in | Pack list | ||
| Pinnacles | 92F | 48F | 0.1 in | Pack list | ||
| Everglades | 91F | 74F | 9.0 in | Pack list | ||
| Biscaynegateway station | 91F | 74F | 8.6 in | Pack list | ||
| Zion | 91F | 61F | 1.2 in | Yes | Pack list | |
| Virgin Islandsgateway station | 89F | 80F | 5.9 in | Pack list | ||
| Dry Tortugas | 89F | 78F | 7.2 in | Pack list | ||
| White Sands | 89F | 56F | 1.5 in | Yes | Pack list | |
| Arches | 87F | 58F | 0.9 in | Yes | Pack list | |
| Congareegateway station | 86F | 67F | 4.3 in | Pack list | ||
| Hot Springs | 86F | 64F | 4.2 in | Yes | Pack list | |
| Big Bend | 86F | 63F | 1.7 in | Pack list | ||
| American Samoagateway station | 86F | 78F | 8.0 in | Yes | Pack list | |
| Mammoth Cave | 85F | 60F | 4.0 in | Pack list | ||
| Carlsbad Caverns | 83F | 60F | 2.9 in | Pack list | ||
| Yosemite | 83F | 51F | 0.4 in | Yes | Pack list | |
| Petrified Forest | 82F | 51F | 1.1 in | Yes | Pack list | |
| Badlands | 82F | 51F | 1.4 in | Yes | Pack list | |
| Gateway Archgateway station | 81F | 61F | 3.0 in | Yes | Pack list | |
| Guadalupe Mountains | 80F | 58F | 2.3 in | Yes | Pack list | |
| Capitol Reef | 80F | 55F | 1.0 in | Yes | Pack list | |
| Canyonlands | 79F | 57F | 1.0 in | Yes | Pack list | |
| Great Smoky Mountains | 78F | 56F | 4.3 in | Yes | Pack list | |
| Wind Cave | 76F | 46F | 1.5 in | 0.2 in | Pack list | |
| Mesa Verde | 76F | 50F | 1.8 in | Pack list | ||
| Grand Canyon | 76F | 44F | 1.5 in | Yes | Pack list | |
| Cuyahoga Valleygateway station | 76F | 57F | 3.9 in | Yes | Pack list | |
| New River Gorgegateway station | 75F | 54F | 3.7 in | Yes | Pack list | |
| Mild: average highs 60F to 74F | ||||||
| Theodore Roosevelt | 74F | 43F | 1.4 in | 0.1 in | Pack list | |
| Indiana Dunes | 74F | 56F | 3.7 in | Pack list | ||
| Channel Islandsgateway station | 74F | 60F | 0.1 in | Yes | Pack list | |
| Great Basin | 73F | 48F | 1.1 in | Yes | Pack list | |
| Hawaii Volcanoes | 73F | 55F | 6.0 in | Pack list | ||
| Kings Canyon | 73F | 47F | 0.3 in | Pack list | ||
| Black Canyon of the Gunnison | 72F | 44F | 2.1 in | Pack list | ||
| Lassen Volcanic | 72F | 41F | 0.7 in | Yes | Pack list | |
| Great Sand Dunes | 72F | 44F | 1.3 in | Pack list | ||
| North Cascades | 71F | 50F | 3.6 in | Yes | Pack list | |
| Acadia | 71F | 53F | 4.2 in | Yes | Pack list | |
| Grand Teton | 71F | 34F | 1.6 in | 0.3 in | Pack list | |
| Bryce Canyon | 70F | 42F | 1.8 in | Yes | Pack list | |
| Sequoia | 70F | 39F | 0.7 in | Pack list | ||
| Rocky Mountaingateway station | 70F | 39F | 1.7 in | 0.5 in | Yes | Pack list |
| Shenandoah | 69F | 52F | n/a | Yes | Pack list | |
| Glacier | 68F | 41F | 2.0 in | Pack list | ||
| Redwood National and State Parks | 67F | 50F | 1.3 in | Yes | Pack list | |
| Voyageursgateway station | 66F | 42F | 3.0 in | 0.1 in | Pack list | |
| Yellowstone | 65F | 30F | 1.7 in | 0.9 in | Pack list | |
| Haleakala | 65F | 48F | 2.5 in | Pack list | ||
| Olympicgateway station | 65F | 51F | 1.2 in | Yes | Pack list | |
| Crater Lake | 63F | 37F | 1.9 in | 1.8 in | Yes | Pack list |
| Cool: average highs 45F to 59F | ||||||
| Mount Rainier | 57F | 41F | 4.4 in | Yes | Pack list | |
| Lake Clark | 57F | 42F | 2.6 in | 0.3 in | Yes | Pack list |
| Katmaigateway station | 56F | 41F | 3.4 in | Yes | Pack list | |
| Kenai Fjordsgateway station | 56F | 43F | 9.9 in | Pack list | ||
| Wrangell-St. Elias | 56F | 33F | 2.6 in | 2.7 in | Pack list | |
| Glacier Bay | 54F | 43F | 9.2 in | Yes | Pack list | |
| Denali | 51F | 31F | 1.7 in | 5.0 in | Yes | Pack list |
| Gates of the Arcticgateway station | 50F | 33F | 2.1 in | 3.2 in | Pack list | |
Source: NOAA NCEI U.S. Climate Normals, 1991-2020 monthly averages, one station per park at or near its main visitor area (each park guide names its station and distance). Gateway stations sit outside the park where no in-park station publishes normals. Isle Royale and Kobuk Valley have no representative station and are left out. Averages describe a typical year, not a forecast.
Planning notes
The week after Labor Day is gold
School is back, summer crowds have left, and nearly every high road is still open. It is the best-value week of the year in many parks.
First snow is possible up high
Crater Lake averages 1.8 inches of snow in September. Alpine roads can close for a day or two after a storm, then reopen.
Big swings between day and night
Estes Park averages a 70F high and a 39F low in September. A base layer and a light puffy cover the whole day.
Frequently asked questions
Is September a good month for national parks?
It is one of the best. Crowds drop after Labor Day, high-country roads are usually still open, the canyon parks cool off, and aspen color starts in the Rockies late in the month.
What is the warmest national park in September?
Death Valley has the warmest September normals of any park with a NOAA station, averaging 108F highs and 79F lows. In the lower 48 the warmest are Death Valley (108F), Joshua Tree (97F), and Saguaro (95F), based on NOAA's 1991-2020 climate normals.
Which national parks stay coolest in September?
In the lower 48, the coolest September normals belong to Mount Rainier (57F average highs), Crater Lake (63F average highs), and Olympic (65F average highs). Figures are for each park's NOAA station, named in its park guide. High elevation and ocean air do the work.
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