June weather forecast
Decatur, IL

Weather in June

The first month of the summer, June, is a warm month in Decatur, Illinois, with average temperature fluctuating between 64°F (17.8°C) and 80.6°F (27°C).

Temperature

In Decatur, Illinois, the average high-temperature slightly increases, from an agreeable 72.9°F (22.7°C) in May, to a warm 80.6°F (27°C). In Decatur, Illinois, in June, the average low-temperature is 64°F (17.8°C).

Heat index

In June, the average heat index is evaluated at 85.5°F (29.7°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, differences in body mass, height, and shape, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Decatur, the average relative humidity is 80%.

Rainfall

In Decatur, it is raining for 13.7 days, with typically 1.93" (49mm) of accumulated precipitation. Throughout the year, there are 130.2 rainfall days, and 16.34" (415mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

With an average of 15h of daylight, June has the longest days of the year.

Sunshine

The month with the most sunshine in Decatur is June, with an average of 10.4h of sunshine.

UV index

Months with the highest UV index in Decatur are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: In June, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in June in Decatur?

In Decatur, Illinois, in June, the average high-temperature is 80.6°F (27°C), and the average low-temperature is 64°F (17.8°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in June is evaluated at 85.5°F (29.7°C).

What is the average humidity in June in Decatur?

The average relative humidity in June in Decatur is 80%.

How much does it rain in Decatur in June?

In Decatur, in June, it is raining for 13.7 days, with typically 1.93" (49mm) of accumulated precipitation.

When it does not snow in Decatur?

In Decatur, Illinois, snow does not fall in May through October.

When are the longest days in Decatur?

The month with the longest days in Decatur is June, with an average of 15h of daylight.

What is the average length of the day in June in Decatur?

The average length of the day in June is 15h.

What month has the most sunshine in Decatur?

With an average of 10.4h of sunshine, June has the most sunshine of the year in Decatur, Illinois.

How many hours of sunshine does Decatur have in June?

The average sunshine in June is 10.4h.

When is the highest UV index in Decatur?

Months with the highest UV index in Decatur, Illinois, are June through August, with an average maximum UV index of 6.

What is the UV index intensity in June in Decatur?

In June, the average daily maximum UV index in Decatur, Illinois, is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to the UV radiation.

Average temperature in June
Decatur, IL

Average temperature in June - Decatur, IL
  • Average high temperature in June: 80.6°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).

  • Average low temperature in June: 64°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in June
Decatur, IL

Average pressure in June - Decatur, IL
  • Average pressure in June: 29.92"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in June
Decatur, IL

Average wind speed in June - Decatur, IL
  • Average wind speed in June: 7.5mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

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Average humidity in June
Decatur, IL

Average humidity in June - Decatur, IL
  • Average humidity in June: 80%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in June
Decatur, IL

Average rainfall in June - Decatur, IL
  • Average rainfall in June: 1.93"

The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are February and December (0.87").

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Average rainfall days in June
Decatur, IL

Average rainfall days in June - Decatur, IL
  • Average rainfall days in June: 13.7 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in June
Decatur, IL

Average snowfall in June - Decatur, IL
  • Average snowfall in June: 0"

The month with the highest snowfall is January (1.85").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in June
Decatur, IL

Average snowfall days in June - Decatur, IL
  • Average snowfall days in June: 0 days

The month with the highest number of snowfall days is January (7.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in June /
Average sunshine in June
Decatur, IL

Average daylight in June / Average sunshine in June - Decatur, IL
  • Average daylight in June: 15h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in June: 10.4h

The month with the most sunshine is June (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.1h).

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Average sunshine days in June
Decatur, IL

Average sunshine days in June - Decatur, IL
  • Average sunshine days in June: 13 days

The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in June
Decatur, IL

Average UV index in June - Decatur, IL
  • Average UV index in June: 6

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

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Average cloud cover in June
Decatur, IL

Average cloud cover in June - Decatur, IL
  • Average cloud cover in June: 30

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in June
Decatur, IL

Average visibility in June - Decatur, IL
  • Average visibility in June: 6mi

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

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