May weather forecastSuperior, WI
May
Weather in May
May marks the onset of summer in Superior with an enveloping warmth and an increase in sunlight hours. An exciting wave of change is marked by the highest rainfall for the year, measured at 0.47" (12mm). Charter fishing begins in full swing, taking advantage of the warmer waters. Blossoming trees and vivid wildflowers paint the landscape, offering captivating views. The clear skies often host magnificent sunsets, casting a dreamy glow on the city.Temperature
The shift into May is marked by a noticeable escalation in the average high-temperature, rising from April's chilly 46°F (7.8°C) to a comfortable 61.3°F (16.3°C). During the month of May, Superior anticipates a mean low-temperature of 42.1°F (5.6°C).Humidity
With an average relative humidity of 72%, May is the least humid month.Rainfall
In Superior, during May, the rain falls for 7.9 days and regularly aggregates up to 0.47" (12mm) of precipitation. Throughout the year, there are 55.7 rainfall days, and 4.33" (110mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.4 snowfall days, in May, Superior aggregates 0.08" (2mm) of snow. Throughout the year, there are 42.8 snowfall days, and 3.39" (86mm) of snow is accumulated.Daylight
In May, the average length of the day is 15h and 4min.On the first day of the month, sunrise is at 5:52 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
In Superior, the average sunshine in May is 8.6h.UV index
In Superior, Wisconsin, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In May, the maximum UV index of 4 suggests this advice:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Superior, WI
- Average high temperature in May: 61.3°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (17.1°F).
- Average low temperature in May: 42.1°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (4.1°F).
Average pressure in May
Superior, WI
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in May
Superior, WI
- Average wind speed in May: 7.7mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in May
Superior, WI
- 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
Superior, WI
- Average rainfall in May: 0.47"
The wettest month (with the highest rainfall) is July (0.67").
The driest months (with the least rainfall) are January and February (0.16").
Average rainfall days in May
Superior, WI
- Average rainfall days in May: 7.9 days
The month with the highest number of rainy days is May (7.9 days).
The month with the least rainy days is February (0.5 days).
Average snowfall in May
Superior, WI
- Average snowfall in May: 0.08"
The month with the highest snowfall is December (0.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Superior, WI
- Average snowfall days in May: 0.4 days
The months with the highest number of snowfall days are January and December (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Superior, WI
- Average daylight in May: 15h and 6min
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 36min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in May
Superior, WI
- Average sunshine days in May: 20.4 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is April (19.9 days).
Average UV index in May
Superior, WI
- 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
Superior, WI
- 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 33).
Average visibility in May
Superior, WI
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
