June weather forecast
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

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

Temperature

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

Heat index

The average heat index in June 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 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, wind, metabolic differences), and activity. 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In St. Louis, Missouri, the average relative humidity in June is 67.1%.

Rainfall

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

Snowfall

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

Daylight

The month with the longest days in St. Louis is June, with an average of 14h and 49min of daylight.
On the first day of June in St. Louis, sunrise is at 5:37 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 8:29 pm CDT.

Sunshine

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

UV index

The months with the highest UV index in St. Louis are June through August, with an average maximum UV index of 9. A UV Index reading of 8 to 10 represents a very high health risk from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 9 in June transform into the following instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. 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. A wide-brim hat offers excellent sun protection for the 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. 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 June, in St. Louis, 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. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, 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, Missouri, is 67.1%.

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

In St. Louis, Missouri, in June, it is raining for 10 days, with typically 4.28" (108.7mm) of accumulated precipitation.

When it does not snow in St. Louis?

May through October are months without snowfall.

When are the longest days in St. Louis?

June has the longest days of the year in St. Louis, Missouri, with an average of 14h and 49min of daylight.

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

In June, the average day length is 14h and 49min.

When are sunrise and sunset in June in St. Louis?

On the first day of June, sunrise is at 5:37 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 8:29 pm CDT.

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

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

What is the month 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 in St. Louis.

How high is the UV index in June in St. Louis?

In St. Louis, the average daily maximum UV index in June is 9. A UV Index of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average UV index

Average temperature in June
St. Louis, MO

Average temperature in June - St. Louis, MO
  • Average high temperature in June: 85.1°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in June: 66.8°F

The month with the highest average low temperature is July (71°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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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: 4.3"

The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").

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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: 0"

The month with the highest snowfall is January (5.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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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).
The 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: 14h and 49min

The month with the longest days is June (Average daylight: 14h and 49min).
The month with the shortest days is December (Average daylight: 9h and 31min).

  • Average sunshine in June: 9h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

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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

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

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