Olympic National Park Weather in September

Olympic National Park in September sees moderate daytime temperatures of 16°C (61°F) and nighttime lows of 7°C (45°F). Moderate rainfall is typical, with around 52 mm (2 in) for the month.

Rainfall in Olympic National Park in September

This month experiences about 12 days of rain according to historical data, averaging 52 mm (2 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Olympic National Park in September

Temperatures in Olympic National Park in September top out at 16°C (61°F) and drop to 7°C (45°F) overnight. September is part of the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights fall to 7°C (45°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Olympic National Park in September

Expect a lot of sunshine this month, with about 204 hours of sun. These sunny conditions add to the overall experience.

If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Olympic National Park.

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• January
• February
• March
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• May
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• October
• November
• December

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

Olympic National Park Temperature in September

Min Temperature 7°C (45°F)  

Max Temperature 16°C (61°F)  

Chance of Rain 39%  

Precipitation 52 mm (2 in)  

Rainy days 12 days  

Humidity 60% *  

Sunshine 204 hours *  

Percentage Sunshine 54% *  

* Data from: Victoria, Canada (52 KM, 32 Miles).

What to Wear in Olympic National Park in September

The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Olympic National Park in September

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

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

10/10

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 Olympic National Park's climate page.

More climate data for Olympic National Park

Temperature Rainfall Sunshine Humidity

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