May weather forecast
Iowa City, IA

Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City
Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City

Weather in May

May, the last month of the spring in Iowa City, is an agreeable month, with an average temperature ranging between max 69.8°F (21°C) and min 53.2°F (11.8°C).

Temperature

In Iowa City, the average high-temperature in May increases from a moderate 58.6°F (14.8°C) in April to an agreeable 69.8°F (21°C). The average low-temperature, in Iowa City, is 53.2°F (11.8°C).

Humidity

The average relative humidity in May in Iowa City is 78%.

Rainfall

May is the month with the most rainfall. Rain falls for 18.4 days and accumulates 4.69" (119mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In Iowa City, the average length of the day in May is 14h and 33min.
On the first day of the month, sunrise is at 6:02 am and sunset at 8:03 pm. On the last day of May, sunrise is at 5:34 am and sunset at 8:33 pm CDT.

Sunshine

In Iowa City, the average sunshine in May is 8.7h.

UV index

In May, the average daily maximum UV index in Iowa City, Iowa, is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the temperature in May in Iowa City?

In May, the average high-temperature is 69.8°F (21°C), and the average low-temperature is 53.2°F (11.8°C).

What is the average humidity in May in Iowa City?

In Iowa City, the average relative humidity in May is 78%.

What is the wettest month in Iowa City?

The month with the most rainfall in Iowa City, Iowa, is May, when the rain falls for 18.4 days and typically aggregates up to 4.69" (119mm) of precipitation.

How many days does it rain in May in Iowa City?

In May, in Iowa City, the rain falls for 18.4 days. Throughout May, 4.69" (119mm) of precipitation is accumulated.

When it does not snow in Iowa City?

In Iowa City, snow does not fall in May through September.

Does it snow in Iowa City in May?

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

What is the average length of the day in May in Iowa City?

In May, the average day length in Iowa City, Iowa, is 14h and 33min.

What time are sunrise and sunset in May in Iowa City?

On the first day of May in Iowa City, Iowa, sunrise is at 6:02 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 5:34 am and sunset at 8:33 pm CDT.

How many hours of sunshine does Iowa City have in May?

In Iowa City, the average sunshine duration in May is 8.7h.

How high is the UV index in May in Iowa City?

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

Average temperature in May
Iowa City, IA

Average temperature in May - Iowa City, IA
  • Average high temperature in May: 69.8°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in May: 53.2°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

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Average pressure in May
Iowa City, IA

Average pressure in May - Iowa City, IA
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in May
Iowa City, IA

Average wind speed in May - Iowa City, IA
  • Average wind speed in May: 9mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

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Average humidity in May
Iowa City, IA

Average humidity in May - Iowa City, IA
  • Average humidity in May: 78%

The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in May
Iowa City, IA

Average rainfall in May - Iowa City, IA
  • Average rainfall in May: 4.69"

The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and February (1.34").

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Average rainfall days in May
Iowa City, IA

Average rainfall days in May - Iowa City, IA
  • Average rainfall days in May: 18.4 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5 days).

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Average snowfall in May
Iowa City, IA

Average snowfall in May - Iowa City, IA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in May
Iowa City, IA

Average snowfall days in May - Iowa City, IA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (10.9 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
Iowa City, IA

Average daylight in May / Average sunshine in May - Iowa City, IA
  • Average daylight in May: 14h and 33min

The month with the longest days is June (Average daylight: 15h and 9min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in May: 8h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in May
Iowa City, IA

Average sunshine days in May - Iowa City, IA
  • Average sunshine days in May: 10 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10 days).

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Average UV index in May
Iowa City, IA

Average UV index in May - Iowa City, IA
  • Average UV index in May: 5

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

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Average cloud cover in May
Iowa City, IA

Average cloud cover in May - Iowa City, IA
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in May
Iowa City, IA

Average visibility in May - Iowa City, IA
  • Average visibility in May: 6mi

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

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