Temperatures in May
It's cool in May in Isle Royale National Park with an average temperature of 14°C. Temperatures this month range from a low of 9°C to a high of 18°C. At night, you can expect temperatures between 1°C and 9°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Isle Royale 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 Isle Royale National Park with cool temperatures, averaging around 12°C during the day and nights close to 2°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 15°C, with nights close to 4°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 Isle Royale National Park will be around 18°C, with nights close to 8°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
Discover cheap holidays to Isle Royale National Park 
Precipitation in May
In May, there is an average of 110 mm of precipitation, spread over 9 days. Of the total precipitation, about 4,6 cm falls as snow in May. The wind speed is around 5 Bft, mostly coming from the South.
The average precipitation chance is 28% per day this month.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in May for Isle Royale 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.
Isle Royale National Park in May |
UK | ||
|---|---|---|---|
 Average Temperature |
14°C | 18°C | |
 High Temp |
18°C | 21°C | |
| Low Temp |
9°C | 15°C | |
 Total Precipitation |
110 mm | 46 mm | |
| Rainy Days |
9 days | 8 days | |
 Total Snowfall |
4,6 cm | 0 cm | |
| Snowy Days |
2 days | 0 days | |
April
UV index
The UV index is a maximum of 9 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 Isle Royale National Park?
After some sun? Then May isn’t the best time to be in Isle Royale National Park. There’s too much chance of rain this month.
Temperature records for Isle Royale National Park in May
With 29°C, Isle Royale National Park hit the highest temperature in the last 10 years in May 2014. The lowest daytime temperature in this month was 3°C in 2019. The extreme night temperatures ranged from a low of -6°C to a high of 13°C.
Check out the climate of Isle Royale National Park for all months and discover the best travel time
Plan your next holiday
Don’t miss the best holiday deals for Isle Royale National Park and see what our partners have for you.
Daily Temperature in May in Isle Royale National Park
This chart shows the average daily temperatures, both day and night, for each day in May in Isle Royale 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 Isle Royale National Park
The chart below shows the average daily precipitation in May for Isle Royale 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 9 days of rain in Isle Royale National Park.
Daily Snowfall in May in Isle Royale National Park
This chart shows the average daily snowfall in May in Isle Royale 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 Isle Royale National Park
This chart shows the average daily UV index in May in Isle Royale 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 Isle Royale National Park Over the Years
This chart shows the average temperature in May in Isle Royale National Park, measured in degrees Celsius, over the past years.
Total Precipitation in May in Isle Royale National Park Over the Years
This chart shows the average precipitation in May in Isle Royale 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 Isle Royale National Park per year
This chart shows the average snowfall in May in Isle Royale National Park, measured in centimetres, over the past years.
Daily climate in May for Isle Royale National Park
Click on a specific day in May for detailed info on the typical weather on that day in Isle Royale National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in May in Isle Royale National Park
Have you been to Isle Royale National Park in May?
Share your weather experience in May in Isle Royale National Park.
Average Weather in Isle Royale National Park by Month
Click on a month below to see detailed weather info for Isle Royale 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 Isle Royale National Park for all months at once
