May weather forecast
Herald, IL

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Weather in May

The last month of the spring, May, is a moderately hot month in Herald, Illinois, with an average temperature fluctuating between 58.3°F (14.6°C) and 75.2°F (24°C).

Temperature

The commencement of May sees a shift in the average high-temperature, moving from an enjoyable 66°F (18.9°C) in April to a warm 75.2°F (24°C). May generally records an average low-temperature of 58.3°F (14.6°C).

Humidity

The months with the highest humidity are May and July, with an average relative humidity of 79%.

Rainfall

In Herald, in May, during 11.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. In Herald, during the entire year, the rain falls for 100.2 days and collects up to 8.7" (221mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In May, the average length of the day is 14h and 14min.
On the first day of the month, sunrise is at 5:55 am and sunset at 7:43 pm. On the last day of May, sunrise is at 5:31 am and sunset at 8:09 pm CDT.

Sunshine

In Herald, the average sunshine in May is 9.2h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: In May, the maximum UV index of 6 translates into these guidelines:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

In Herald, 75.2°F (24°C) is the average high-temperature and 58.3°F (14.6°C) is the average low-temperature during May.

What is the most humid month?

May and July, with an average relative humidity of 79%, are most humid months in Herald.

What is the average humidity in May?

The average relative humidity in May is 79%.

How many days does it rain in May?

In Herald, in May, during 11.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall.

What is the average length of the day in May?

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

When is the sunrise / sunset in May?

On the first day of May, sunrise is at 5:55 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 8:09 pm CDT.

How many hours of sunshine does Herald have in May?

In Herald, the average sunshine duration in May is 9.2h.

What are the months with the highest UV index?

May through August, with an average maximum UV index of 6, are months with the highest UV index.

How high is the UV index in May?

The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health vulnerability 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
Herald, IL

Average temperature in May - Herald, IL
  • Average high temperature in May: 75.2°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in May: 58.3°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in May
Herald, IL

Average pressure in May - Herald, IL
  • Average pressure in May: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in May
Herald, IL

Average wind speed in May - Herald, IL
  • Average wind speed in May: 8.3mph

The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in May
Herald, IL

Average humidity in May - Herald, IL
  • Average humidity in May: 79%

The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (69%).

Average rainfall in May
Herald, IL

Average rainfall in May - Herald, IL
  • Average rainfall in May: 0.98"

The wettest month (with the highest rainfall) is April (1.06").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in May
Herald, IL

Average rainfall days in May - Herald, IL
  • Average rainfall days in May: 11.9 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is January (5 days).

Average snowfall in May
Herald, IL

Average snowfall in May - Herald, IL
  • Average snowfall in May: 0"

The months with the highest snowfall are January and February (0.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in May
Herald, IL

Average snowfall days in May - Herald, IL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in May /
Average sunshine in May
Herald, IL

Average daylight in May / Average sunshine in May - Herald, IL
  • Average daylight in May: 14h and 1min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in May: 9h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in May
Herald, IL

Average sunshine days in May - Herald, IL
  • Average sunshine days in May: 15.8 days

The month with the most sunshine days is October (23.4 days).
The month with the least sunshine days is May (15.8 days).

Average UV index in May
Herald, IL

Average UV index in May - Herald, IL
  • Average UV index in May: 6

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in May
Herald, IL

Average cloud cover in May - Herald, IL
  • Average cloud cover in May: 38

The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 27).

Average visibility in May
Herald, IL

Average visibility in May - Herald, IL
  • Average visibility in May: 6mi

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

Herald, Illinois, USA

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