May weather forecast
Lake Bluff, IL

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Weather in May

May flourishes with balmy temperatures, progressing Lake Bluff further into the heart of spring. The increase in daylight hours introduce warmer, longer days, outranking its April predecessor. The occasional drizzle showers the revitalized flora, brushing up the stunning prismatic view of the cityscape. Lake Bluff is bathed in hues of blossoming flowers and the buzz of warm weather activities is in the air. As May ebbs away, the refreshing vibe gradually leans towards summer buzz, setting the tone for the warmer months to come.

Temperature

An escalation in the average high-temperature is seen with the onset of May, moving from a cool 50.9°F (10.5°C) in April to a comfortable 61.2°F (16.2°C). During May, the nighttime temperature in Lake Bluff, Illinois, averages of 49.6°F (9.8°C).

Humidity

In Lake Bluff, the average relative humidity in May is 79%.

Rainfall

The wettest months in Lake Bluff, Illinois, are May and June, with an average 3.82" (97mm) of rainfall.

Snowfall

May through September are months without snowfall.

Ocean temperature

In Lake Bluff, the average seawater temperature in May is 43.3°F (6.3°C).
Note: In 43.3°F (6.3°C), even brief exposure to 55.4°F (13°C) feels biting, and anything less than 50°F (10°C) risks cold shock and impaired breathing, considering one's health.

Daylight

In Lake Bluff, the average length of the day in May is 14h and 37min.
On the first day of May in Lake Bluff, Illinois, sunrise is at 5:45 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 5:17 am and sunset at 8:21 pm CDT.

Sunshine

In Lake Bluff, the average sunshine in May is 8.9h.

UV index

In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 4 in May interprets into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
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Frequently asked questions

What are the temperatures in Lake Bluff in May?

The average high-temperature, in May, in Lake Bluff, is 61.2°F (16.2°C), while the average low-temperature is 49.6°F (9.8°C).

What is the average humidity in May in Lake Bluff?

In May, the average relative humidity in Lake Bluff, Illinois, is 79%.

What is the wettest month in Lake Bluff?

The months with the most rainfall in Lake Bluff are May and June, with an average 3.82" (97mm) of precipitation.

How many days does it rain in May in Lake Bluff?

In Lake Bluff, Illinois, in May, it is raining for 17.7 days, with typically 3.82" (97mm) of accumulated precipitation.

When it does not snow in Lake Bluff?

In Lake Bluff, Illinois, snow does not fall in May through September.

Does it snow in Lake Bluff in May?

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

What is the water temperature in May in Lake Bluff?

In Lake Bluff, in May, the average water temperature is 43.3°F (6.3°C). Swimming in 43.3°F (6.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in May in Lake Bluff?

In May, the average day length in Lake Bluff is 14h and 37min.

What time are sunrise and sunset in May in Lake Bluff?

In May, on the first day of the month, sunrise is at 5:45 am and sunset at 7:51 pm. On the last day of the month, in Lake Bluff, sunrise is at 5:17 am and sunset at 8:21 pm CDT.

How many hours of sunshine does Lake Bluff have in May?

The average sunshine duration in May in Lake Bluff is 8.9h.

What is the UV index intensity in May in Lake Bluff?

In Lake Bluff, Illinois, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
50.9°F 10.5°C
61.2°F 16.2°C
71.1°F 21.7°C
Average low temperature
39.7°F 4.3°C
49.6°F 9.8°C
59.4°F 15.2°C
Average pressure
29.95" 761mmHg
29.96" 761mmHg
29.92" 760mmHg
Average wind speed
10.8mph 17.4km/h
9.1mph 14.6km/h
8.1mph 13km/h
Average max. wind speed
11.6mph 18.7km/h
9.7mph 15.6km/h
8.8mph 14.2km/h
Average wind speed gusts
18.4mph 29.6km/h
16.7mph 26.9km/h
14.7mph 23.7km/h
Average humidity
77%
79%
79%
Average rainfall
3.43" 87mm
3.82" 97mm
3.82" 97mm
Average rainfall days
16.1
17.7
16.6
Average snowfall
1.89" 48mm
0" 0mm
0" 0mm
Average snowfall days
2.4
0
0
Average sea temperature
40.2°F 4.6°C
43.4°F 6.3°C
56.6°F 13.7°C
Average daylight
13h 2min
14h 4min
15h 1min
Average sunshine
7h 5min
8h 5min
10h 0min
Average sunshine days
10.8
11.2
11.2
Average UV index
3
4
6
Average cloud cover
48%
41%
32%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Lake Bluff, IL

Average temperature in May - Lake Bluff, IL
  • Average high temperature in May: 61.2°F

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (28.6°F).

  • Average low temperature in May: 49.6°F

The months with the highest average low temperature are July and August (66.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

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Average pressure in May
Lake Bluff, IL

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
Lake Bluff, IL

Average wind speed in May - Lake Bluff, IL
  • Average wind speed in May: 9.1mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average humidity in May
Lake Bluff, IL

Average humidity in May - Lake Bluff, IL
  • Average humidity in May: 79%

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

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Average rainfall in May
Lake Bluff, IL

Average rainfall in May - Lake Bluff, IL
  • Average rainfall in May: 3.82"

The wettest months (with the highest rainfall) are May and June (3.82").
The driest month (with the least rainfall) is December (1.3").

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Average rainfall days in May
Lake Bluff, IL

Average rainfall days in May - Lake Bluff, IL
  • Average rainfall days in May: 17.7 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.9 days).

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Average snowfall in May
Lake Bluff, IL

Average snowfall in May - Lake Bluff, IL
  • Average snowfall in May: 0"

The month with the highest snowfall is January (4.13").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in May
Lake Bluff, IL

Average snowfall days in May - Lake Bluff, IL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in May
Lake Bluff, IL

Average sea temperature in May - Lake Bluff, IL
  • Average sea temperature in May: 43.4°F

The best month for swimming (with the highest average sea temperature) is August (73.3°F).
The coldest month (with the lowest average sea temperature) is February (37.1°F).

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Average daylight in May /
Average sunshine in May
Lake Bluff, IL

Average daylight in May / Average sunshine in May - Lake Bluff, IL
  • Average daylight in May: 14h and 4min

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

  • Average sunshine in May: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in May
Lake Bluff, IL

Average sunshine days in May - Lake Bluff, IL
  • Average sunshine days in May: 11.2 days

The month with the most sunshine days is December (15.3 days).
The month with the least sunshine days is April (10.8 days).

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Average UV index in May
Lake Bluff, IL

Average UV index in May - Lake Bluff, IL
  • Average UV index in May: 4

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in May
Lake Bluff, IL

Average cloud cover in May - Lake Bluff, IL
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 27).

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Average visibility in May
Lake Bluff, IL

Average visibility in May - Lake Bluff, 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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Lake Bluff, Illinois, USA

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