September weather forecast and climate
Olympic National Park, WA

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

What is the temperature in September in Olympic National Park?

The average high-temperature, in September, in Olympic National Park, is 68.5°F (20.3°C), while the average low-temperature is 47.5°F (8.6°C).
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).

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 lowest rainfall) is July (0.8").

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 lowest number of rainy days is July (5 days).

Average snowfall in September - Olympic National Park, WA
  • Average snowfall in September: 0"

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

Average daylight in September - Olympic National Park, WA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.5h).

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