June weather forecast
Harrisburg, IL

June marks the commencement of the Summer season in Harrisburg, Illinois. Temperatures maintain within the limits of 66.2°F (19°C) to 84.7°F (29.3°C), giving inhabitants a taste of intense warmth. Typically characterized by sunny days and balmy nights, June provides an ideal setting for numerous outdoor activities, including barbecuing and poolside lounging. Towards the end of the month, the heat intensifies, befitting the peak Summer months of July and August around the corner.

Temperature

In Harrisburg, the average high-temperature in June rises, from 75.6°F (24.2°C) in May, to a still warm 84.7°F (29.3°C). Harrisburg observes an average nighttime low-temperature of 66.2°F (19°C) during the month of June.

Heat index

The average heat index in June is evaluated at a fiery hot 95°F (35°C). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in June in Harrisburg is 76%.

Rainfall

In June, the rain falls for 15.6 days. Throughout June, 3.46" (88mm) of precipitation is accumulated. In Harrisburg, during the entire year, the rain falls for 158.6 days and collects up to 36.02" (915mm) of precipitation.

Snowfall

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

Daylight

The month with the longest days is June, with an average of 14h and 42min of daylight.
On the first day of June, sunrise is at 5:33 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 5:35 am and sunset at 8:20 pm CDT.

Sunshine

June has the most sunshine of the year, with an average of 10.6h of sunshine.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 6 in June converts into the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.