May weather forecast
Dubuque, IA

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A small railway line in Dubuque, Iowa, set on a hilly and scenic greenery spot overlooking the brown buildings in the rest of the city
A small railway line in Dubuque, Iowa, set on a hilly and scenic greenery spot overlooking the brown buildings in the rest of the city

Weather in May

The splendid Dubuque weather in May is a treat for both residents and visitors. As the city inches further into spring, a significant increase in average temperatures up to a high of 66.9°F (19.4°C), introduces more comfortable and warm conditions. The rainfall peaks at 3.7" (94mm), and although this might suggest gray skies, May typically continues with its gift of long daylight hours. Vibrant greenery starts reclaiming the city's landscapes and parks, shimming under the lingering sunshine. The promising weather encourages more outdoor recreation, making it one of the busiest months in the city's social calendar.

Temperature

May's arrival in Dubuque is marked by an increase in the average high-temperature, moving from a mild 55.9°F (13.3°C) in April to an enjoyable 66.9°F (19.4°C). Throughout May, Dubuque anticipates an average low-temperature of 50.2°F (10.1°C).

Humidity

The average relative humidity in May in Dubuque is 81%.

Rainfall

The months with the most rainfall are May and June, with an average 3.7" (94mm) of precipitation.

Snowfall

In Dubuque, snow does not fall in May through September.

Daylight

In May, the average length of the day is 14h and 38min.
On the first day of the month, sunrise is at 5:56 am and sunset at 8:03 pm. On the last day of May, in Dubuque, sunrise is at 5:27 am and sunset at 8:33 pm CDT.

Sunshine

In May, the average sunshine in Dubuque is 8.2h.

UV index

The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 5 during May translates into the following guidance:
Take precautions - Protection against skin and eye damage is obliged. To protect against the Sun's most potent rays, avoid direct exposure around midday. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
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Frequently asked questions

What is the usual temperature for Dubuque in May?

In May, the average high-temperature and low-temperature in Dubuque, Iowa, are 66.9°F (19.4°C) and 50.2°F (10.1°C) respectively.

What is the average humidity in May in Dubuque?

The average relative humidity in May is 81%.

What is the rainiest month in Dubuque?

The wettest months in Dubuque, Iowa, are May and June, with an average 3.7" (94mm) of rainfall.

How much does it rain in Dubuque in May?

In May, in Dubuque, Iowa, the rain falls for 17.7 days. Throughout May, 3.7" (94mm) of precipitation is accumulated.

When it does not snow in Dubuque?

In Dubuque, snow does not fall in May through September.

Does it snow in Dubuque in May?

In May, in Dubuque, Iowa, it doesn't snow. April is the latest month when it typically snows.

How many hours of daylight does Dubuque have in May?

In Dubuque, the average day length in May is 14h and 38min.

When is the sunrise / sunset in May in Dubuque?

In May, on the first day of the month, sunrise is at 5:56 am and sunset at 8:03 pm. On the last day of the month, in Dubuque, Iowa, sunrise is at 5:27 am and sunset at 8:33 pm CDT.

How many hours of sunshine does Dubuque have in May?

The average sunshine duration in May in Dubuque is 8.2h.

How high is the UV index in May in Dubuque?

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

Average temperature in May
Dubuque, IA

Average temperature in May - Dubuque, IA
  • Average high temperature in May: 66.9°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).

  • Average low temperature in May: 50.2°F

The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).

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Average pressure in May
Dubuque, IA

Average pressure in May - Dubuque, IA
  • Average pressure in May: 29.95"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in May
Dubuque, IA

Average wind speed in May - Dubuque, IA
  • Average wind speed in May: 8.9mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in May
Dubuque, IA

Average humidity in May - Dubuque, IA
  • Average humidity in May: 81%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is October (76%).

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Average rainfall in May
Dubuque, IA

Average rainfall in May - Dubuque, IA
  • Average rainfall in May: 3.7"

The wettest months (with the highest rainfall) are May and June (3.7").
The driest months (with the least rainfall) are January and February (1.14").

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Average rainfall days in May
Dubuque, IA

Average rainfall days in May - Dubuque, IA
  • Average rainfall days in May: 17.7 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in May
Dubuque, IA

Average snowfall in May - Dubuque, IA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in May
Dubuque, IA

Average snowfall days in May - Dubuque, IA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Dubuque, IA

Average daylight in May / Average sunshine in May - Dubuque, IA
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in May: 8h and 1min

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in May
Dubuque, IA

Average sunshine days in May - Dubuque, IA
  • Average sunshine days in May: 12.1 days

The months with the most sunshine days are November and December (17.5 days).
The month with the least sunshine days is June (10.3 days).

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Average UV index in May
Dubuque, IA

Average UV index in May - Dubuque, IA
  • Average UV index in May: 5

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

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Average cloud cover in May
Dubuque, IA

Average cloud cover in May - Dubuque, IA
  • Average cloud cover in May: 45

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in May
Dubuque, IA

Average visibility in May - Dubuque, IA
  • Average visibility in May: 6mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

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Dubuque, Iowa, USA

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