Weather in September
Temperature
The arrival of September signals a subtle shift in temperature, down from a moderately hot 74.1°F (23.4°C) in August to an agreeable 68.5°F (20.3°C). Throughout the nights in September, an average low-temperature of 47.5°F (8.6°C) is noted.Rainfall
In Olympic National Park, in September, during 8 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. Throughout the year, there are 149 rainfall days, and 56.3" (1430mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 33min.On the first day of September, 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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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
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When it does not snow in Olympic National Park?
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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 least 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 least 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").
The months with the least snowfall are April, May, June, July, August, September and October (0").
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).
Olympic National Park, Washington, USA
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