June weather forecast and climate
St. Louis, MO

A beautiful twilight over the Gateway Arch in St. Louis, Missouri
A beautiful twilight over the Gateway Arch in St. Louis, Missouri

Weather in June

June, the first month of the summer, in St. Louis, is still a warm month, with average temperature fluctuating between 66.7°F (19.3°C) and 85.1°F (29.5°C).

Temperature

In St. Louis, Missouri, the average high-temperature in June slightly increases, from 76.3°F (24.6°C) in May, to a still moderately hot 85.1°F (29.5°C). In June, in St. Louis, the average low-temperature is 66.7°F (19.3°C).

Heat index

The average heat index is evaluated at a hot 91.8°F (33.2°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, metabolic differences, 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 especially crucial for babies and toddlers. 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 June, the average relative humidity in St. Louis is 67.1%.

Rainfall

In St. Louis, in June, during 10 rainfall days, 4.28" (108.7mm) of precipitation is typically accumulated. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.96" (1040.3mm) of precipitation.

Snowfall

May through October are months without snowfall in St. Louis.

Daylight

June has the longest days of the year in St. Louis, with an average of 14.8h of daylight.

Sunshine

The average sunshine in St. Louis is 9.7h.

UV index

June through August, with an average maximum UV index of 9, are months with the highest UV index in St. Louis. A UV Index value of 8 to 10 symbolizes a very high threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 9 interpret into the following advice:
Take special precautions, as unprotected skin can be damaged and can burn quickly. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.
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FAQ

What is the temperature in June in St. Louis?

In St. Louis, Missouri, in June, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 66.7°F (19.3°C). In June, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is evaluated at 91.8°F (33.2°C).

What is the average humidity in June in St. Louis?

The average relative humidity in June in St. Louis is 67.1%.

How many days does it rain in June in St. Louis?

In St. Louis, in June, during 10 rainfall days, 4.28" (108.7mm) of precipitation is typically accumulated.

When it does not snow in St. Louis?

In St. Louis snow does not fall in May through October.

When are the longest days in St. Louis?

With an average of 14.8h of daylight, June has the longest days of the year.

What is the average length of the day in June in St. Louis?

The average length of the day in June is 14.8h.

How many hours of sunshine does St. Louis have in June?

In St. Louis, the average sunshine in June is 9.7h.

What are the months with the highest UV index in St. Louis?

June through August, with an average maximum UV index of 9, are months with the highest UV index.

What is the UV index reading in June in St. Louis?

The average daily maximum UV index in June in St. Louis is 9. A UV Index estimate of 8 to 10 represents a very high hazard to health from unprotected exposure to the UV radiation.

Average temperature in June
St. Louis, MO

Average temperature in June - St. Louis, MO
  • Average high temperature in June: 29.5°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is January (4.4°C).

  • Average low temperature in June: 19.3°C

The month with the highest average low temperature is July (21.7°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

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Average humidity in June
St. Louis, MO

Average humidity in June - St. Louis, MO
  • Average humidity in June: 67.1%

The month with the highest relative humidity is December (75.8%).
The month with the lowest relative humidity is April (63.5%).

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Average rainfall in June
St. Louis, MO

Average rainfall in June - St. Louis, MO
  • Average rainfall in June: 108.7mm

The wettest month (with the highest rainfall) is May (119.9mm).
The driest month (with the least rainfall) is February (56.9mm).

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Average rainfall days in June
St. Louis, MO

Average rainfall days in June - St. Louis, MO
  • Average rainfall days in June: 10 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is September (7.4 days).

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Average snowfall in June
St. Louis, MO

Average snowfall in June - St. Louis, MO
  • Average snowfall in June: 0mm

The month with the highest snowfall is January (142.2mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in June
St. Louis, MO

Average snowfall days in June - St. Louis, MO
  • Average snowfall days in June: 0 days

The month with the highest number of snowfall days is January (4.7 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
St. Louis, MO

Average daylight in June / Average sunshine in June - St. Louis, MO
  • Average daylight in June: 14.8h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in June: 9.7h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is December (Average sunshine: 4.2h).

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Average UV index in June
St. Louis, MO

Average UV index in June - St. Louis, MO
  • Average UV index in June: 9

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).

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