Duluth
Minnesota, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Duluth, MN

A dusk view of bright neon lights in Duluth, Minnesota, and a clear view of the lit Aerial Lift Bridge, and two long piers with lighthouses at the ends
A dusk view of bright neon lights in Duluth, Minnesota, and a clear view of the lit Aerial Lift Bridge, and two long piers with lighthouses at the ends
May, the last month of the spring, in Duluth, is a comfortable month, with average temperature fluctuating between 40.6°F (4.8°C) and 62.2°F (16.8°C).

Temperature

In May, the average high-temperature increases, from a frosty 49.3°F (9.6°C) in April, to a comfortable 62.2°F (16.8°C). In Duluth, in May, the average low-temperature is 40.6°F (4.8°C).

Humidity

The least humid month is May, with an average relative humidity of 62.7%.

Rainfall

In Duluth, it is raining for 12.3 days, with typically 3.2" (82mm) of accumulated precipitation. Throughout the year, in Duluth, there are 131.4 rainfall days, and 31" (786.3mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Duluth are January through May, September through December.

Ocean temperature

In Duluth, the average seawater temperature 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.

Daylight

In May, the average length of the day is 15.1h.

Sunshine

The average sunshine in Duluth is 8.5h.

UV index

In May, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for average individuals.
In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Duluth?

The average high-temperature, in May, is 62.2°F (16.8°C), while the average low-temperature is 40.6°F (4.8°C).

What is the least humid month in Duluth?

The least humid month in Duluth, Minnesota, is May, with an average relative humidity of 62.7%.

What is the average humidity in May in Duluth?

The average relative humidity in May is 62.7%.

How much does it rain in Duluth in May?

In Duluth, in May, it is raining for 12.3 days, with typically 3.2" (82mm) of accumulated precipitation.

What is the last month it snows in Duluth?

May is the last month it regularly snows. During 0.5 snowfall days, in May, Duluth aggregates 0.4" (10.2mm) of snow.

What is the ocean temperature in May in Duluth?

In Duluth, in May, the average water temperature 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?

In Duluth, the average length of the day in May is 15.1h.

How long on average sun shines in May in Duluth?

In Duluth, Minnesota, the average sunshine in May is 8.5h.

What is the UV index intensity in May in Duluth?

The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in May - Duluth, MN
  • Average high temperature in May: 62.2°F

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (18.9°F).

  • Average low temperature in May: 40.6°F

The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is January (1.5°F).

Average humidity in May - Duluth, MN
  • Average humidity in May: 62.7%

The month with the highest relative humidity is December (76.3%).
The month with the lowest relative humidity is May (62.7%).

Average rainfall in May - Duluth, MN
  • Average rainfall in May: 3.2"

The wettest month (with the highest rainfall) is June (4.2").
The driest month (with the lowest rainfall) is February (0.8").

Average rainfall days in May - Duluth, MN
  • Average rainfall days in May: 12.3 days

The month with the highest number of rainy days is June (12.6 days).
The month with the lowest number of rainy days is February (8.5 days).

Average snowfall in May - Duluth, MN
  • Average snowfall in May: 0.4"

The month with the highest snowfall is January (19.4").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in May - Duluth, MN
  • Average snowfall days in May: 0.5 days

The month with the highest number of snowfall days is January (12.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

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).
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: 15.1h

The month with the longest days is June (Average daylight: 15.8h).
The month with shortest days is December (Average daylight: 8.6h).

  • Average sunshine in May: 8.5h

The month with most sunshine is July (Average sunshine: 9.9h).
Months with least sunshine are November and December (Average sunshine: 3.3).

Average UV index in May - Duluth, MN
  • Average UV index in May: 6

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).