May weather forecast
Fairview Heights, IL

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Weather in May

The last month of the spring, May, is a warm month in Fairview Heights, Illinois, with an average temperature fluctuating between 74.8°F (23.8°C) and 57.9°F (14.4°C).

Temperature

In Fairview Heights, stepping into May brings a temperature increase, moving up from April's enjoyable 65.5°F (18.6°C) to a warm 74.8°F (23.8°C). Throughout the May nights, Fairview Heights encounters a low-temperature of 57.9°F (14.4°C).

Humidity

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

Rainfall

May is the month with the most rainfall. Rain falls for 16.4 days and accumulates 4.37" (111mm) of precipitation.

Snowfall

April through October are months without snowfall in Fairview Heights.

Daylight

In Fairview Heights, the average length of the day in May is 14h and 17min.
On the first day of the month, sunrise is at 6:01 am and sunset at 7:52 pm. On the last day of May, in Fairview Heights, sunrise is at 5:37 am and sunset at 8:18 pm CDT.

Sunshine

In Fairview Heights, the average sunshine in May is 9.1h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In May, an average UV index of 6 transforms into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jun 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in May?

The high-temperature during May is 74.8°F (23.8°C) and the low-temperature is 57.9°F (14.4°C).

What is the most humid month?

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

What is the average humidity in May?

In Fairview Heights, the average relative humidity in May is 79%.

What is the wettest month?

The month with the most rainfall is May, when the rain falls for 16.4 days and typically aggregates up to 4.37" (111mm) of precipitation.

How many days does it rain in May?

In May, the rain falls for 16.4 days. Throughout May, 4.37" (111mm) of precipitation is accumulated.

When it does not snow?

In Fairview Heights, snow does not fall in April through October.

How many hours of daylight does Fairview Heights have in May?

The average day length in May is 14h and 17min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 6:01 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 5:37 am and sunset at 8:18 pm CDT.

How long on average sun shines in May?

In Fairview Heights, the average sunshine duration in May is 9.1h.

What is the month with the highest UV index?

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

What is the UV index intensity in May?

The average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high hazard to health 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
Fairview Heights, IL

Average temperature in May - Fairview Heights, IL
  • Average high temperature in May: 74.8°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in May: 57.9°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in May
Fairview Heights, IL

Average pressure in May - Fairview Heights, IL
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in May
Fairview Heights, IL

Average wind speed in May - Fairview Heights, IL
  • Average wind speed in May: 7.5mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).

Average humidity in May
Fairview Heights, IL

Average humidity in May - Fairview Heights, 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 (71%).

Average rainfall in May
Fairview Heights, IL

Average rainfall in May - Fairview Heights, IL
  • Average rainfall in May: 4.37"

The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.93").

Average rainfall days in May
Fairview Heights, IL

Average rainfall days in May - Fairview Heights, IL
  • Average rainfall days in May: 16.4 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6.8 days).

Average snowfall in May
Fairview Heights, IL

Average snowfall in May - Fairview Heights, IL
  • Average snowfall in May: 0"

The month with the highest snowfall is January (2.4").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in May
Fairview Heights, IL

Average snowfall days in May - Fairview Heights, IL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in May /
Average sunshine in May
Fairview Heights, IL

Average daylight in May / Average sunshine in May - Fairview Heights, IL
  • Average daylight in May: 14h and 2min

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 30min).

  • Average sunshine in May: 9h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

Average sunshine days in May
Fairview Heights, IL

Average sunshine days in May - Fairview Heights, IL
  • Average sunshine days in May: 12.3 days

The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is May (12.3 days).

Average UV index in May
Fairview Heights, IL

Average UV index in May - Fairview Heights, 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 and December (UV index 2).

Average cloud cover in May
Fairview Heights, IL

Average cloud cover in May - Fairview Heights, IL
  • Average cloud cover in May: 39

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in May
Fairview Heights, IL

Average visibility in May - Fairview Heights, 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).

Fairview Heights, Illinois, USA

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