May weather forecast
Granite City, IL

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Weather in May

The last month of the spring, May, is a warm month in Granite City, Illinois, with an average temperature varying between 74.7°F (23.7°C) and 57.7°F (14.3°C).

Temperature

Granite City in May shows a temperature shift, moving from an average high of a refreshing 65.1°F (18.4°C) in April to a moderately hot 74.7°F (23.7°C). An average nighttime temperature of 57.7°F (14.3°C) is witnessed throughout May.

Humidity

With an average relative humidity of 78%, May is the most humid month.

Rainfall

The month with the most rainfall is May, when the rain falls for 17.8 days and typically aggregates up to 4.21" (107mm) of precipitation.

Snowfall

In Granite City, snow does not fall in April through October.

Daylight

In Granite City, the average length of the day in May is 14h and 18min.
On the first day of May, sunrise is at 6:02 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:37 am and sunset at 8:19 pm CDT.

Sunshine

In Granite City, the average sunshine in May is 9.5h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Granite City. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 6 translates into the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. 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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Frequently asked questions

What is the usual temperature for Granite City in May?

Granite City in May has an average high-temperature of 74.7°F (23.7°C) and an average low-temperature of 57.7°F (14.3°C).

What is the most humid month in Granite City?

May is the most humid month in Granite City, Illinois, with an average relative humidity of 78%.

What is the average humidity in May in Granite City?

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

What is the rainiest month in Granite City?

May is the month with the most rainfall. Rain falls for 17.8 days and accumulates 4.21" (107mm) of precipitation.

How much does it rain in Granite City in May?

In Granite City, Illinois, in May, during 17.8 rainfall days, 4.21" (107mm) of precipitation is typically accumulated.

When it does not snow in Granite City?

In Granite City, Illinois, snow does not fall in April through October.

How many hours of daylight does Granite City have in May?

In Granite City, Illinois, the average day length in May is 14h and 18min.

When is the sunrise / sunset in May in Granite City?

On the first day of May in Granite City, Illinois, sunrise is at 6:02 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:37 am and sunset at 8:19 pm CDT.

How long on average sun shines in May in Granite City?

The average sunshine duration in May is 9.5h.

What are the months with the highest UV index in Granite City?

The months with the highest UV index in Granite City, Illinois, are May through August, with an average maximum UV index of 6.

What is the UV index intensity in May in Granite City?

In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high hazard to health from 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
Granite City, IL

Average temperature in May - Granite City, IL
  • Average high temperature in May: 74.7°F

The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (37.2°F).

  • Average low temperature in May: 57.7°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in May
Granite City, IL

Average pressure in May - Granite City, 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).

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Average wind speed in May
Granite City, IL

Average wind speed in May - Granite City, IL
  • Average wind speed in May: 7.3mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).

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Average humidity in May
Granite City, IL

Average humidity in May - Granite City, IL
  • Average humidity in May: 78%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in May
Granite City, IL

Average rainfall in May - Granite City, IL
  • Average rainfall in May: 4.21"

The wettest month (with the highest rainfall) is May (4.21").
The driest month (with the least rainfall) is February (1.93").

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Average rainfall days in May
Granite City, IL

Average rainfall days in May - Granite City, IL
  • Average rainfall days in May: 17.8 days

The months with the highest number of rainy days are May and July (17.8 days).
The month with the least rainy days is January (8.4 days).

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Average snowfall in May
Granite City, IL

Average snowfall in May - Granite City, IL
  • Average snowfall in May: 0"

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

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Average snowfall days in May
Granite City, IL

Average snowfall days in May - Granite City, IL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (6.3 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
Granite City, IL

Average daylight in May / Average sunshine in May - Granite City, 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 3min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in May
Granite City, IL

Average sunshine days in May - Granite City, IL
  • Average sunshine days in May: 10.7 days

The month with the most sunshine days is December (18 days).
The month with the least sunshine days is June (10.1 days).

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Average UV index in May
Granite City, IL

Average UV index in May - Granite City, 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).

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Average cloud cover in May
Granite City, IL

Average cloud cover in May - Granite City, IL
  • Average cloud cover in May: 37

The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are June and August (Cloud cover 28).

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Average visibility in May
Granite City, IL

Average visibility in May - Granite City, 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).

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Granite City, Illinois, USA

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