May weather forecast
Duluth, MN

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The lit Aerial Lift Bridge and two long piers with lighthouses at the ends in Duluth, Minnesota
The lit Aerial Lift Bridge and two long piers with lighthouses at the ends in Duluth, Minnesota

Weather in May

May offers an overt change in Duluth's weather, inciting residents to welcome the onset of summer. The city benefits from warmer temperatures, copious amounts of sunshine, and minimal snowfall. Adding to the favorable weather, the daily hours of sunshine increase, significantly brightening the city. A unique aspect of May's weather is the sea temperature's fluctuation, distinguishing itself as the first month with a change in this regard. The average high temperature leaps to 61°F (16.1°C), marking the shift toward summer weather.

Temperature

As May begins, there is a noticeable increase in the average high-temperature, soaring from a frosty 46°F (7.8°C) in April to a refreshing 61°F (16.1°C). May brings an average low-temperature of 41.9°F (5.5°C) to Duluth.

Humidity

With an average relative humidity of 72%, May is the least humid month in Duluth, Minnesota.

Rainfall

In May, the rain falls for 16.3 days. Throughout May, 2.83" (72mm) of precipitation is accumulated. Throughout the year, in Duluth, there are 135.2 rainfall days, and 24.53" (623mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Duluth, Minnesota. May is the last month it regularly snows in Duluth. During 0.8 snowfall days, in May, Duluth aggregates 0.2" (5mm) of snow. In Duluth, during the entire year, snow falls for 90.9 days and aggregates up to 33.27" (845mm) of snow.

Ocean temperature

In Duluth, the average seawater temperature in May is 37.4°F (3°C).
Note: In the sport of swimming, this scenario is extremely cold, treacherous, and fatal. If not protected by insulated waterproof clothing, hypothermia ensues quickly.

Daylight

In Duluth, Minnesota, the average length of the day in May is 15h and 4min.
On the first day of the month, sunrise is at 5:51 am and sunset at 8:18 pm. On the last day of May, sunrise is at 5:18 am and sunset at 8:54 pm CDT.

Sunshine

The average sunshine in May in Duluth, Minnesota, is 8.5h.

UV index

The average daily maximum UV index in May in Duluth is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in May interprets into the following advice:
Prioritize safety - Recommendations to avert sunburn are shared. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Duluth in May?

In May, in Duluth, the average high-temperature is 61°F (16.1°C), and the average low-temperature is 41.9°F (5.5°C).

What is the least humid month in Duluth?

The least humid month is May, with an average relative humidity of 72%.

What is the average humidity in May in Duluth?

In Duluth, Minnesota, the average relative humidity in May is 72%.

How much does it rain in Duluth in May?

In Duluth, in May, it is raining for 16.3 days, with typically 2.83" (72mm) of accumulated precipitation.

What is the last month it snows in Duluth?

May is the last month it regularly snows in Duluth. During 0.8 snowfall days, in May, Duluth aggregates 0.2" (5mm) of snow.

What is the ocean temperature in May in Duluth?

In May, the average ocean temperature in Duluth, Minnesota, is 37.4°F (3°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the average length of the day in May in Duluth?

The average day length in May in Duluth is 15h and 4min.

When is the sunrise / sunset in May in Duluth?

In May, on the first day of the month, sunrise is at 5:51 am and sunset at 8:18 pm. On the last day of the month, in Duluth, sunrise is at 5:18 am and sunset at 8:54 pm CDT.

How many hours of sunshine does Duluth have in May?

The average sunshine duration in May is 8.5h.

What is the UV index intensity in May in Duluth?

In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Duluth, MN

Average temperature in May - Duluth, MN
  • Average high temperature in May: 61°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (16.3°F).

  • Average low temperature in May: 41.9°F

The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (3.9°F).

Average pressure in May
Duluth, MN

Average pressure in May - Duluth, MN
  • Average pressure in May: 29.95"Hg

The month with the highest atmospheric pressure is February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in May
Duluth, MN

Average wind speed in May - Duluth, MN
  • Average wind speed in May: 7.8mph

The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity in May
Duluth, MN

Average humidity in May - Duluth, MN
  • Average humidity in May: 72%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).

Average rainfall in May
Duluth, MN

Average rainfall in May - Duluth, MN
  • Average rainfall in May: 2.83"

The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is January (0.87").

Average rainfall days in May
Duluth, MN

Average rainfall days in May - Duluth, MN
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.3 days).

Average snowfall in May
Duluth, MN

Average snowfall in May - Duluth, MN
  • Average snowfall in May: 0.2"

The month with the highest snowfall is December (7.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Duluth, MN

Average snowfall days in May - Duluth, MN
  • Average snowfall days in May: 0.8 days

The month with the highest number of snowfall days is January (20.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in May
Duluth, MN

Average sea temperature in May - Duluth, MN
  • Average sea temperature in May: 37°F

The best month for swimming (with the highest average sea temperature) is August (61°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

Average daylight in May /
Average sunshine in May
Duluth, MN

Average daylight in May / Average sunshine in May - Duluth, MN
  • Average daylight in May: 15h and 1min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in May: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days in May
Duluth, MN

Average sunshine days in May - Duluth, MN
  • Average sunshine days in May: 11.3 days

The month with the most sunshine days is November (13.7 days).
The month with the least sunshine days is June (10.1 days).

Average UV index in May
Duluth, MN

Average UV index in May - Duluth, MN
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

Average cloud cover in May
Duluth, MN

Average cloud cover in May - Duluth, MN
  • Average cloud cover in May: 44

The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in May
Duluth, MN

Average visibility in May - Duluth, MN
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Duluth, Minnesota, USA

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