May weather forecast
Harvey, IL

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Weather in May

The last month of the spring, May, is a pleasant month in Harvey, Illinois, with an average temperature ranging between max 68.7°F (20.4°C) and min 52.3°F (11.3°C).

Temperature

Entering May, Harvey sees a temperature rise, with the average high-temperature advancing from April's moderate 56.7°F (13.7°C) to a pleasant 68.7°F (20.4°C). Harvey registers a consistent average low-temperature of 52.3°F (11.3°C) during May.

Humidity

In Harvey, the average relative humidity in May is 76%.

Rainfall

The month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 4.17" (106mm) of precipitation.

Snowfall

In Harvey, snow does not fall in May through September.

Daylight

In Harvey, Illinois, the average length of the day in May is 14h and 33min.
On the first day of the month, sunrise is at 5:46 am and sunset at 7:49 pm. On the last day of May, sunrise is at 5:18 am and sunset at 8:18 pm CDT.

Sunshine

The average sunshine in May in Harvey is 8.6h.

UV index

In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A maximum UV index of 5 in May translates into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.

Frequently asked questions

What is the temperature in May?

May temperatures vary between a high-temperature of 68.7°F (20.4°C) and a low-temperature of 52.3°F (11.3°C).

What is the average humidity in May?

In May, the average relative humidity is 76%.

What is the wettest month?

The month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 4.17" (106mm) of precipitation.

How many days does it rain in May?

In Harvey, in May, it is raining for 17.4 days, with typically 4.17" (106mm) of accumulated precipitation.

When it does not snow?

May through September are months without snowfall.

Does it snow in May?

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

How many hours of daylight does Harvey have in May?

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

When are sunrise and sunset in May?

On the first day of May, sunrise is at 5:46 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 5:18 am and sunset at 8:18 pm CDT.

How many hours of sunshine does Harvey have in May?

In May, the average sunshine duration is 8.6h.

How high is the UV index in May?

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
Harvey, IL

Average temperature in May - Harvey, IL
  • Average high temperature in May: 68.7°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in May: 52.3°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in May
Harvey, IL

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

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in May
Harvey, IL

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

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in May
Harvey, IL

Average humidity in May - Harvey, IL
  • Average humidity in May: 76%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in May
Harvey, IL

Average rainfall in May - Harvey, IL
  • Average rainfall in May: 4.17"

The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").

Average rainfall days in May
Harvey, IL

Average rainfall days in May - Harvey, IL
  • Average rainfall days in May: 17.4 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).

Average snowfall in May
Harvey, IL

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

The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May
Harvey, IL

Average snowfall days in May - Harvey, IL
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in May / Average sunshine in May - Harvey, IL
  • Average daylight in May: 14h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in May
Harvey, IL

Average sunshine days in May - Harvey, IL
  • Average sunshine days in May: 11.8 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).

Average UV index in May
Harvey, IL

Average UV index in May - Harvey, IL
  • 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 December (UV index 1).

Average cloud cover in May
Harvey, IL

Average cloud cover in May - Harvey, IL
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in May
Harvey, IL

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

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

Harvey, Illinois, USA

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