May weather forecast and climate
Des Moines, IA

City buildings in Des Moines, Iowa
City buildings in Des Moines, Iowa
May, the last month of the spring, in Des Moines, is an agreeable month, with temperature in the range of an average high of 69.6°F (20.9°C) and an average low of 53.1°F (11.7°C).

Temperature

In Des Moines, the average high-temperature in May rises, from a moderate 59.7°F (15.4°C) in April, to a pleasant 69.6°F (20.9°C). In May, in Des Moines, the average low-temperature is 53.1°F (11.7°C).

Humidity

In Des Moines, the average relative humidity is 78%.

Rainfall

May is the month with the most rainfall. Rain falls for 15.3 days and accumulates 2.76" (70mm) of precipitation.

Snowfall

Months with snowfall in Des Moines are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, Des Moines aggregates 0.08" (2mm) of snow. In Des Moines, during the entire year, snow falls for 30.9 days, and aggregates up to 7.36" (187mm) of snow.

Daylight

In May, the average length of the day is 14.6h.

Sunshine

The average sunshine in May is 8.6h.

UV index

The average daily maximum UV index in Des Moines is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in May in Des Moines?

In May, the average high-temperature is 69.6°F (20.9°C), and the average low-temperature is 53.1°F (11.7°C).

What is the average humidity in May in Des Moines?

In May, the average relative humidity is 78%.

How many days does it rain in May in Des Moines?

In Des Moines, Iowa, in May, during 15.3 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

What is the rainiest month in Des Moines?

The month with the most rainfall in Des Moines, Iowa, is May when the rain falls for 15.3 days and typically aggregates up to 2.76" (70mm) of precipitation.

What is the last month it snows in Des Moines?

May is the last month it regularly snows. During 0.2 snowfall days, in May, Des Moines aggregates 0.08" (2mm) of snow.

How many hours of daylight does Des Moines have in May?

In May, the average length of the day is 14.6h.

How long on average sun shines in May in Des Moines?

The average sunshine in May is 8.6h.

How high is the UV index in May in Des Moines?

The average daily maximum UV index in May in Des Moines is 5. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.
Average temperature in May - Des Moines, IA
  • Average high temperature in May: 69.6°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in May: 53.1°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).

Average pressure in May - Des Moines, IA
  • Average pressure in May: 29.93"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.88").

Average wind speed in May - Des Moines, IA
  • Average wind speed in May: 8.8mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

Average humidity in May - Des Moines, IA
  • Average humidity in May: 78%

Months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (70%).

Average rainfall in May - Des Moines, IA
  • Average rainfall in May: 2.76"

The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in May - Des Moines, IA
  • Average rainfall days in May: 15.3 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (3 days).

Average snowfall in May - Des Moines, IA
  • Average snowfall in May: 0.08"

The month with the highest snowfall is January (2.24").
Months with the least snowfall are June, July, August and September (0").

Average snowfall days in May - Des Moines, IA
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (8.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - Des Moines, IA
  • Average daylight in May: 14.6h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in May: 8.6h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 4.3h).

Average sunshine days in May - Des Moines, IA
  • Average sunshine days in May: 12.4 days

The month with the most sunshine days is December (22.3 days).
The month with the least sunshine days is June (12.2 days).

Average UV index in May - Des Moines, IA
  • Average UV index in May: 5

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in May - Des Moines, IA
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 54).
Months with the least cloud cover are July and September (Cloud cover 29).

Average visibility in May - Des Moines, IA
  • Average visibility in May: 6mi

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