St. Louis
Missouri, USA
Long-term weather forecast
Long-term weather forecast

June weather forecast and climate
St. Louis, MO

A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
Junio, the first month of the summer, in St. Louis, is also a moderately hot month, with temperature in the range of an average high of 85.1°F (29.5°C) and an average low of 66.7°F (19.3°C).

Temperature

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

Heat index

In Junio, the average heat index is appraised at a hot 91.8°F (33.2°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, pregnancy, metabolic differences, and wind affect individual temperature impact. 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 is 67.1%.

Rainfall

In St. Louis, during Junio, 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

In St. Louis snow does not fall in Mayo through Octubre.

Daylight

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

Sunshine

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

UV index

Junio through Agosto, with an average maximum UV index of 9, are months with the highest UV index in St. Louis, Missouri. A UV Index of 8 to 10 symbolizes a very high health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In Junio, the average maximum UV index of 9 translate into the following recommendations:
Take special precautions, as unprotected skin can be damaged and can burn 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 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.

What is the temperature in Junio in St. Louis?

In Junio, 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 Junio, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, is calculated to 91.8°F (33.2°C).

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

In Junio, the average relative humidity is 67.1%.

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

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

When it does not snow in St. Louis?

In St. Louis, Missouri, snow does not fall in Mayo through Octubre.

When are the longest days in St. Louis?

The month with the longest days in St. Louis, Missouri, is Junio, with an average of 14.8h of daylight.

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

In St. Louis, the average length of the day in Junio is 14.8h.

How long on average sun shines in Junio in St. Louis?

In Junio, the average sunshine is 9.7h.

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

Junio through Agosto, with an average maximum UV index of 9, are months with the highest UV index.

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

In Junio, the average daily maximum UV index in St. Louis is 9. A UV Index estimate of 8 to 10 represents a very high health risk from unsafe exposure to the Sun's UV rays.
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).

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%).

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 lowest rainfall) is February (2.2").

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 lowest number of rainy days is September (7.4 days).

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

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

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 lowest number of snowfall days are May, June, July, August, September and October (0 days).

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 shortest days is December (Average daylight: 9.5h).

  • Average sunshine in June: 9.7h

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

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).