September weather - Autumn 2024 - Olympic National Park, WA

Weather in September
Frequently asked questions
Average temperature in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average daylight in September

The incredibly scenic Green Moss stream flowing downstream in the Olympic National Park, Washington

Weather in September

September serves as the transition period from summer to fall in Olympic National Park. It maintains the heat of summer with average maximum temperatures touching 68.5°F (20.3°C) but introducing the essence of fall towards the end. Contrasting with the drier August, September brings a slight increase in rainfall, signalling the beginning of the cooler months. As summer makes way for autumn, September creates a tapestry of colors and seasons that accentuates the beauty of Olympic National Park.

Temperature

In September, the average high-temperature in Olympic National Park marginally decreases from a warm 74.1°F (23.4°C) in August to an agreeable 68.5°F (20.3°C). Olympic National Park in September experiences a low-temperature average of 47.5°F (8.6°C).

Rainfall

In Olympic National Park, during September, the rain falls for 8 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, in Olympic National Park, Washington, there are 149 rainfall days, and 56.3" (1430mm) of precipitation is accumulated.

Snowfall

In Olympic National Park, snow does not fall in April through October.

Daylight

In Olympic National Park, Washington, the average length of the day in September is 12h and 33min.
On the first day of September in Olympic National Park, sunrise is at 6:33 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:54 pm PDT.

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Frequently asked questions

What are the temperatures in Olympic National Park in September?

In September, the average high-temperature and low-temperature are 68.5°F (20.3°C) and 47.5°F (8.6°C) respectively.

How much does it rain in Olympic National Park in September?

In Olympic National Park, Washington, in September, it is raining for 8 days, with typically 1.77" (45mm) of accumulated precipitation.

When it does not snow in Olympic National Park?

April through October are months without snowfall.

What is the average length of the day in September in Olympic National Park?

In Olympic National Park, the average day length in September is 12h and 33min.

When is the sunrise / sunset in September in Olympic National Park?

On the first day of September in Olympic National Park, sunrise is at 6:33 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:54 pm PDT.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

74.1°F 23.4°C

68.5°F 20.3°C

56.9°F 13.8°C

Average low temperature

Average rainfall

Average rainfall days

Average snowfall

Average daylight

Average temperature in September
Olympic National Park, WA

Average high temperature in September: 68.5°F

The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is January (40.7°F).

Average low temperature in September: 47.5°F

The month with the highest average low temperature is August (50.9°F).
The coldest month (with the lowest average low temperature) is January (31.1°F).

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Average rainfall in September
Olympic National Park, WA

Average rainfall in September: 1.8"

The wettest month (with the highest rainfall) is December (9.9").
The driest month (with the least rainfall) is July (0.8").

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Average rainfall days in September
Olympic National Park, WA

Average rainfall days in September: 8 days

The month with the highest number of rainy days is November (18 days).
The month with the least rainy days is July (5 days).

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Average snowfall in September
Olympic National Park, WA

Average snowfall in September: 0"

The month with the highest snowfall is January (7.1").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average daylight in September
Olympic National Park, WA

Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

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September weather forecast
Olympic National Park, WA

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