June weather forecast
Washington, MO

June, the first month of the summer in Washington, is still a warm month, with an average temperature fluctuating between 85.6°F (29.8°C) and 64.9°F (18.3°C).

Temperature

The shift into June is accompanied by a temperature increase, with the average high-temperature rising from a moderately hot 75.7°F (24.3°C) in May to a still warm 85.6°F (29.8°C). Washington's nights in June cool down to an average low-temperature of 64.9°F (18.3°C).

Heat index

For most parts of June, the heat index is calculated to be a very hot 96.8°F (36°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

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

Rainfall

In Washington, in June, during 13.1 rainfall days, 2.64" (67mm) of precipitation is typically accumulated. Throughout the year, in Washington, there are 133.1 rainfall days, and 27.24" (692mm) of precipitation is accumulated.

Snowfall

In Washington, snow does not fall in April through August and October.

Daylight

With an average of 14h and 48min of daylight, June has the longest days of the year in Washington.
On the first day of June in Washington, sunrise is at 5:41 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 5:43 am and sunset at 8:32 pm CDT.

Sunshine

June and July, with an average of 10.3h of sunshine, are months with the most sunshine.

UV index

The months with the highest UV index in Washington are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: A maximum daily UV index of 6 during June morphs into the following directions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.