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United StatesThe weather in September in Olympic National Park
It's cool to moderate in September in Olympic National Park with an average temperature of 18°C. Temperatures this month range from a low of 16°C to a high of 21°C. At night, you can expect temperatures between 9°C and 12°C.
Looking for great weather? September is a good time to be in Olympic National Park. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Olympic National Park, Washington. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 28°C in 2017, Olympic National Park reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 12°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 18°C.
Rainfall amount
In September, there is an average of 71 mm of precipitation, spread over 11 days. The wind speed is around 3 Bft, mostly coming from the West.
Daily weather in September for Olympic National Park
Click on any day in September to get detailed info about the usual weather on that day in Olympic National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Olympic National Park | New York | |
|---|---|---|
| Average temperature | 18°C | 27°C |
| Max. temperature | 21°C | 31°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 71 mm | 57 mm |
| Rainy days | 11 days | 9 days |
Start of September
The month of September starts in Olympic National Park with mild temps, averaging around 20°C during the day and nights around 12°C.
Mid September
By mid-September, daytime temps drop to around 18°C, with nights around 12°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Olympic National Park is around 17°C, while nighttime temps are about 11°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Olympic National Park for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Olympic National Park, Washington. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Olympic National Park
Temperature in September in Olympic National Park over the years
Precipitation charts
These charts show the average amount of precipitation in September in Olympic National Park, Washington. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Olympic National Park
Total precipitation in September in Olympic National Park over the years
Daily UV index in September in Olympic National Park
This chart shows the average daily UV index in September in Olympic National Park, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Olympic National Park
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Average weather in Olympic National Park by month
Click on a month below to see detailed weather info for Olympic National Park. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.