Mount Rainier National Park Weather in September

Mount Rainier National Park in September sees low temperatures, with highs around 8°C (46°F) and overnight lows of -3°C (27°F). Snow/rainfall is fairly high at around 122 mm (4.8 in) on average, so pack waterproofs just in case.

Rainfall in Mount Rainier National Park in September

This month experiences about 12 days of snow/rain according to historical data, averaging 122 mm (4.8 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Mount Rainier National Park in September

In September, Mount Rainier National Park sees low temperatures, with highs of 8°C (46°F). Nights drop to around -3°C (27°F). September is part of the summer season. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. Nights are well below freezing at -3°C (27°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation.

Sunshine in Mount Rainier National Park in September

Enjoy a sunny month with about 209 hours of sunshine, making it one of the brighter months of the year despite the cool conditions.

If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Mount Rainier National Park . Our weather planner can help you explore destinations with more pleasant weather conditions.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Mount Rainier National Park 's climate page.

Mount Rainier National Park Temperature in September

Min Temperature -3°C (27°F)  

Max Temperature 8°C (46°F)  

Chance of Rain 40%  

Precipitation 122 mm (4.8 in)  

Rainy days 12 days  

Sunshine 209 hours *  

Percentage Sunshine 55% *  

* Data from: Tacoma, the United States of America (68 KM, 42 Miles).

What to Wear in Mount Rainier National Park in September

Cold weather calls for smart layering in September. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Mount Rainier National Park in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

1/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Mount Rainier National Park 's climate page.

More climate data for Mount Rainier National Park

Temperature Rainfall Sunshine

See the full Mount Rainier National Park climate overview or explore weather in the United States of America.