June weather forecast
Marion, IL

Summer is in full effect during June in Marion, boasting the longest daylight hours of the year. The average temperatures rise to become the highest of the year, with the high averaging 84.7°F (29.3°C) and lows around 66.4°F (19.1°C). The duration of sunshine also hits its peak in June, providing plenty of warmth and light. Despite the high temperature, the rainfall remains under control. As June transitions to July, the temperature remains relatively stable, but expect a slight increase in rainfall.

Temperature

In June, the meteorological conditions change with the average high-temperature moving from a warm 75.4°F (24.1°C) in May to a still moderately hot 84.7°F (29.3°C). Marion experiences an average low-temperature reading of 66.4°F (19.1°C) throughout June.

Heat index

The heat index for June is estimated at a sweltering 95°F (35°C). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Heat index evaluations are typically in the context of light winds and shaded environments. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In Marion, the average relative humidity in June is 76%.

Rainfall

In Marion, in June, during 13.3 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Marion, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

June has the longest days of the year, with an average of 14h and 42min of daylight.
On the first day of the month, sunrise is at 5:35 am and sunset at 8:12 pm. On the last day of June, sunrise is at 5:37 am and sunset at 8:21 pm CDT.

Sunshine

The months with the most sunshine are June and July, with an average of 10.5h of sunshine.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A maximum high UV index of 6 in June translates into the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.