Temperatures in May
It's cool to moderate in May in Mount Rainier National Park with an average temperature of 17°C. Temperatures this month range from a low of 15°C to a high of 20°C. At night, you can expect temperatures between 5°C and 9°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Mount Rainier National Park in May. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of May
The month of May starts in Mount Rainier National Park with cool temperatures, averaging around 17°C during the day and nights close to 6°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-May
By mid-May, the average daytime temperature rises to around 18°C, with nights close to 8°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of May
By the end of May, the average daytime temperature in Mount Rainier National Park will be around 19°C, with nights close to 9°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
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Precipitation in May
In May, there is an average of 78 mm of precipitation, spread over 11 days. Of the total precipitation, about 12 cm falls as snow in May. The wind speed is around 3 Bft, mostly coming from the Southwest.
The average precipitation chance is 35% per day this month. The weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in May for Mount Rainier National Park. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Mount Rainier National Park in May |
UK | ||
|---|---|---|---|
 Average Temperature |
17°C | 18°C | |
 High Temp |
20°C | 21°C | |
| Low Temp |
15°C | 15°C | |
 Total Precipitation |
78 mm | 46 mm | |
| Rainy Days |
11 days | 8 days | |
 Total Snowfall |
12 cm | 0 cm | |
| Snowy Days |
2 days | 0 days | |
April
UV index
The UV index is a maximum of 10 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is May a good time to visit Mount Rainier National Park?
Looking for sun and warm weather? Then May isn’t the best time to be in Mount Rainier National Park. The temperature is too low this month for a warm stay.
Temperature records for Mount Rainier National Park in May
With 32°C, Mount Rainier National Park hit the highest temperature in the last 10 years in May 2023. The lowest daytime temperature in this month was 7°C in 2022. The extreme night temperatures ranged from a low of 0°C to a high of 16°C.
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Daily Temperature in May in Mount Rainier National Park
This chart shows the average daily temperatures, both day and night, for each day in May in Mount Rainier National Park, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in May in Mount Rainier National Park
The chart below shows the average daily precipitation in May for Mount Rainier National Park, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for May, you can expect around 11 days of rain in Mount Rainier National Park.
Daily Snowfall in May in Mount Rainier National Park
This chart shows the average daily snowfall in May in Mount Rainier National Park, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in May.
Daily UV Index in May in Mount Rainier National Park
This chart shows the average daily UV index in May 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.
Temperature in May in Mount Rainier National Park Over the Years
This chart shows the average temperature in May in Mount Rainier National Park, measured in degrees Celsius, over the past years.
Total Precipitation in May in Mount Rainier National Park Over the Years
This chart shows the average precipitation in May in Mount Rainier National Park, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in May in Mount Rainier National Park per year
This chart shows the average snowfall in May in Mount Rainier National Park, measured in centimetres, over the past years.
Daily climate in May for Mount Rainier National Park
Click on a specific day in May for detailed info on the typical weather on that day in Mount Rainier National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in May in Mount Rainier National Park
Have you been to Mount Rainier National Park in May?
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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.
Or check out the climate of Mount Rainier National Park for all months at once
