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United StatesThe weather in September in Mount Rainier National Park
It's pleasantly warm in September in Mount Rainier National Park with an average temperature of 20°C. Temperatures this month range from a low of 15°C to a high of 25°C. At night, you can expect temperatures between 7°C and 13°C.
Looking for sun? September isn’t a good month to be in Mount Rainier National Park. The temperature is nice, but there’s too much chance of 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 Mount Rainier 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 31°C in 2014, Mount Rainier National Park reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 8°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of -2°C to a highest value of 17°C.
Precipitation and snowfall
In September, there is an average of 135 mm of precipitation, spread over 15 days. Of the total precipitation, about 0,1 cm falls as snow in September. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in September for Mount Rainier National Park
Click on any day in September to get detailed info about the usual weather on that day in Mount Rainier National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Mount Rainier National Park | New York | |
|---|---|---|
| Average temperature | 20°C | 27°C |
| Max. temperature | 25°C | 31°C |
| Min. temperature | 7°C | -5°C |
| Total precipitation | 135 mm | 57 mm |
| Rainy days | 15 days | 9 days |
| Total snowfall | 0,1 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in Mount Rainier National Park with warm temps, averaging around 24°C during the day and nights around 13°C.
Mid September
By mid-September, daytime temps drop to around 20°C, with nights around 10°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Mount Rainier National Park is around 18°C, while nighttime temps are about 9°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 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Temperature charts
These charts show the average temperatures in September in Mount Rainier 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 Mount Rainier National Park
Temperature in September in Mount Rainier National Park over the years
Precipitation charts
These charts show the average amount of precipitation in September in Mount Rainier 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 Mount Rainier National Park
Total precipitation in September in Mount Rainier National Park over the years
Daily Snowfall in September in Mount Rainier National Park
Snowfall in September in Mount Rainier National Park per year
Daily UV index in September in Mount Rainier National Park
This chart shows the average daily UV index in September in Mount Rainier 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 Mount Rainier National Park
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Average weather in Mount Rainier National Park by month
Click on a month below to see detailed weather info for Mount Rainier National Park. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.