May weather forecast
West Union, IA

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Weather in May

May, the last month of the spring in West Union, is an enjoyable month, with an average temperature varying between 66.6°F (19.2°C) and 49.8°F (9.9°C).

Temperature

With the transition into May, West Union experiences an increase in average high-temperatures, moving up from a cool 54.5°F (12.5°C) in April to a refreshing 66.6°F (19.2°C). During May, the average low-temperature is a chilly 49.8°F (9.9°C).

Humidity

In West Union, the average relative humidity in May is 80%.

Rainfall

In May, the rain falls for 19.8 days. Throughout May, 4.37" (111mm) of precipitation is accumulated. In West Union, during the entire year, the rain falls for 146.5 days and collects up to 31.3" (795mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in West Union. During 0.3 snowfall days, in May, West Union aggregates 0.2" (5mm) of snow. In West Union, during the entire year, snow falls for 59.9 days and aggregates up to 24.84" (631mm) of snow.

Daylight

In May, the average length of the day is 14h and 40min.
On the first day of the month, sunrise is at 5:59 am and sunset at 8:08 pm. On the last day of May, sunrise is at 5:30 am and sunset at 8:39 pm CDT.

Sunshine

In West Union, the average sunshine in May is 8.1h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 5 during May translates into the following directions:
Exercise prevention - Precautions against solar damage are endorsed. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

In May, the average high-temperature and low-temperature in West Union are 66.6°F (19.2°C) and 49.8°F (9.9°C) respectively.

What is the average humidity in May?

In West Union, the average relative humidity in May is 80%.

How many days does it rain in May?

In West Union, in May, during 19.8 rainfall days, 4.37" (111mm) of precipitation is typically accumulated.

What is the last month it snows?

May is the last month it regularly snows. During 0.3 snowfall days, in May, West Union aggregates 0.2" (5mm) of snow.

How many hours of daylight does West Union have in May?

The average day length in May is 14h and 40min.

What time are sunrise and sunset in May?

In May, on the first day of the month, sunrise is at 5:59 am and sunset at 8:08 pm. On the last day of the month, in West Union, sunrise is at 5:30 am and sunset at 8:39 pm CDT.

How long on average sun shines in May?

In West Union, the average sunshine duration in May is 8.1h.

What is the month with the highest UV index?

The months with the highest UV index are May through August, with an average maximum UV index of 5.

What is the UV index reading in May in West Union?

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
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
West Union, IA

Average temperature in May - West Union, IA
  • Average high temperature in May: 66.6°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (22.8°F).

  • Average low temperature in May: 49.8°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).

Average pressure in May
West Union, IA

Average pressure in May - West Union, 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 (29.89"Hg).

Average wind speed in May
West Union, IA

Average wind speed in May - West Union, IA
  • Average wind speed in May: 9.3mph

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 (7.1mph).

Average humidity in May
West Union, IA

Average humidity in May - West Union, IA
  • Average humidity in May: 80%

The month with the highest relative humidity is January (89%).
The months with the lowest relative humidity are April and October (75%).

Average rainfall in May
West Union, IA

Average rainfall in May - West Union, IA
  • Average rainfall in May: 4.37"

The wettest month (with the highest rainfall) is June (5.08").
The driest month (with the least rainfall) is January (1.18").

Average rainfall days in May
West Union, IA

Average rainfall days in May - West Union, IA
  • Average rainfall days in May: 19.8 days

The months with the highest number of rainy days are May and June (19.8 days).
The month with the least rainy days is February (4.3 days).

Average snowfall in May
West Union, IA

Average snowfall in May - West Union, IA
  • Average snowfall in May: 0.2"

The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
West Union, IA

Average snowfall days in May - West Union, IA
  • Average snowfall days in May: 0.3 days

The month with the highest number of snowfall days is January (14.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
West Union, IA

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

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in May: 8h and 1min

The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in May
West Union, IA

Average sunshine days in May - West Union, IA
  • Average sunshine days in May: 9 days

The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.9 days).

Average UV index in May
West Union, IA

Average UV index in May - West Union, IA
  • Average UV index in May: 5

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in May
West Union, IA

Average cloud cover in May - West Union, 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).

Average visibility in May
West Union, IA

Average visibility in May - West Union, IA
  • Average visibility in May: 6mi

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

West Union, Iowa, USA

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