June weather forecast
St. Louis, MO

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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

St. Louis experiences the official advent of summer in June. Temperatures continue their upward incline, creating warm, typically summery conditions. Average daytime temperatures climb to a pleasant 66.8°F, perfect for enjoying an outdoor picnic or a leisurely day boating on the Mississippi. The sunny days of June yield high UV indexes, encouraging residents to take necessary sun precautions. Intermittent spells of rainfall serve as a refreshing break from the summer heat.

Temperature

As May transitions into June in St. Louis, a subtle temperature shift is observed, with average highs adjusting from a moderately hot 76.3°F to a still warm 85.1°F. The average low-temperature, in June, in St. Louis, is a refreshing 66.7°F.

Heat index

In June, the average heat index is appraised at a tropical 91.4°F. Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.

Humidity

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

Rainfall

In June, in St. Louis, the rain falls for 10 days. Throughout June, 4.29" of precipitation is accumulated. In St. Louis, Missouri, during the entire year, the rain falls for 112.6 days and collects up to 40.94" of precipitation.

Snowfall

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

Daylight

The month with the longest days in St. Louis, Missouri, is June, with an average of 14h and 48min of daylight.
On the first day of the month, sunrise is at 5:37 am and sunset at 8:19 pm. On the last day of June, in St. Louis, sunrise is at 5:39 am and sunset at 8:29 pm CDT.

Sunshine

In June, the average sunshine in St. Louis, Missouri, 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 reading of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index, 9 during June, leads to the following recommendations:
Remember to safeguard yourself. Rapid damage can occur to skin and eyes without protection. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Experience reduced UV exposure by about half when donning a wide-brim hat. Even under cloud cover, use sunscreen with at least an SPF 30 generously and reapply frequently post every swim or outdoor exercise.
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FAQ

How hot is June in St. Louis?

In St. Louis, in June, the average high-temperature is 85.1°F, and the average low-temperature is 66.7°F. In June, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 91.4°F.

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

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

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

In June, in St. Louis, the rain falls for 10 days. Throughout June, 4.29" of precipitation is accumulated.

When it does not snow in St. Louis?

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

When are the longest days in St. Louis?

The month with the longest days is June, with an average of 14h and 48min of daylight.

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

In St. Louis, Missouri, the average day length in June is 14h and 49min.

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

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.

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

The average sunshine duration in June in St. Louis, Missouri, is 9.7h.

When is 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 intensity in June in St. Louis?

In June, the average daily maximum UV index in St. Louis, Missouri, is 9. A UV Index value of 8 to 10 symbolizes a very high hazard to health from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
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 5min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in June: 9h and 4min

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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St. Louis, Missouri, USA

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