Climate and monthly 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 January

January, like December, in St. Louis is a wintry winter month, with temperature in the range of an average low of 23.7°F (-4.6°C) and an average high of 39.9°F (4.4°C). January is the coldest month in St. Weather in January »

Weather in February

February, the last month of the winter in St. Louis, is a chilly month, with an average temperature varying between 45°F (7.2°C) and 27.7°F (-2.4°C). In St. Louis, the average high-temperature in February is relatively the same as in January - a chilly 45°F (7.2°C). Weather in February »

Weather in March

March, the first month of the spring in St. Louis, is a mild month, with an average temperature ranging between min 36.7°F (2.6°C) and max 55.9°F (13.3°C). In March, the average high-temperature in St. Weather in March »

Weather in April

April in St. Louis is an enjoyable spring month, with an average temperature ranging between max 67.5°F (19.7°C) and min 47.1°F (8.4°C). In St. Louis, Missouri, the average high-temperature in April increases from a mild 55.9°F (13.3°C) in March to a comfortable 67.5°F (19.7°C). Weather in April »

Weather in May

The last month of the spring, May, is a warm month in St. Louis, with an average temperature ranging between min 57.2°F (14°C) and max 76.3°F (24.6°C). In St. Louis, the average high-temperature in May marginally rises from an enjoyable 67.5°F (19.7°C) in April to a warm 76.3°F (24.6°C). Weather in May »

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). In June, the average high-temperature in St. Weather in June »

Weather in July

July in St. Louis is a tropical summer month, with an average temperature fluctuating between 71.1°F (21.7°C) and 89.1°F (31.7°C). The warmest month in St. Louis, Missouri, is July, with an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C). In July, the average heat index is evaluated at a sweltering 102°F (38.9°C). Weather in July »

Weather in August

The last month of the summer, August, is another hot month in St. Louis, with temperature in the range of an average low of 69.4°F (20.8°C) and an average high of 88°F (31.1°C). In St. Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in St. Louis, with an average temperature ranging between max 80.2°F (26.8°C) and min 60.6°F (15.9°C). In September, the average high-temperature in St. Weather in September »

Weather in October

October, the same as September, in St. Louis is another pleasant autumn month, with an average temperature fluctuating between 48.9°F (9.4°C) and 68.5°F (20.3°C). In St. Louis, the average high-temperature in October decreases from a moderately hot 80.2°F (26.8°C) in September to a pleasant 68.5°F (20.3°C). Weather in October »

Weather in November

November, the last month of the autumn in St. Louis, is another mild month, with an average temperature varying between 55.6°F (13.1°C) and 38.1°F (3.4°C). In November, the average high-temperature in St. Weather in November »

Weather in December

December, the first month of the winter in St. Louis, is still a cold month, with an average temperature varying between 27°F (-2.8°C) and 42.4°F (5.8°C). In St. Louis, the average high-temperature in December decreases from a moderate 55.6°F (13.1°C) in November to a cold 42.4°F (5.8°C). Weather in December »
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FAQ

What is the coldest month in St. Louis?

With an average high-temperature of 39.9°F (4.4°C) and an average low-temperature of 23.7°F (-4.6°C), January is the coldest month in St. Louis.

How many days does it rain in St. Louis?

In St. Louis, Missouri, during the entire year, the rain falls for 112.6 days and collects up to 40.96" (1040.3mm) of precipitation.

When does it snow in St. Louis?

Months with snowfall in St. Louis are January through April, November and December.

What is the snowiest month in St. Louis?

January is the month with the most snowfall in St. Louis. Snow falls for 4.7 days and accumulates 5.6" (142.2mm) of snow.

How many days does it snow in St. Louis?

Throughout the year, in St. Louis, Missouri, there are 14.5 snowfall days, and 17.7" (449.6mm) of snow is accumulated.

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

The months with the lowest UV index in St. Louis are January and December, with an average maximum UV index of 2.

What is the driest month in St. Louis?

February is the month with the least rainfall in St. Louis, Missouri. Rain falls for 8 days and accumulates 2.24" (56.9mm) of precipitation.

When is Daylight Saving Time (DST) in St. Louis?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in St. Louis, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

What is the least humid month in St. Louis?

With an average relative humidity of 63.5%, April is the least humid month in St. Louis.

What is the rainiest month in St. Louis?

May is the month with the most rainfall in St. Louis. Rain falls for 11.9 days and accumulates 4.72" (119.9mm) of precipitation.

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?

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

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, Missouri.

What is the warmest month in St. Louis?

The warmest month is July, with an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C).

What month has the most sunshine in St. Louis?

With an average of 10h of sunshine, July has the most sunshine of the year.

What is the most humid month in St. Louis?

December is the most humid month, with an average relative humidity of 75.8%.

What is the month with the shortest days in St. Louis?

December has the shortest days of the year, with an average of 9h and 31min of daylight.

What is the month with the least sunshine in St. Louis?

With an average of 4.2h of sunshine, December has the least sunshine of the year in St. Louis.

Average temperature
St. Louis, MO

Average temperature - St. Louis, MO

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).

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
St. Louis, MO

Average humidity - St. Louis, MO

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
St. Louis, MO

Average rainfall - St. Louis, MO

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
St. Louis, MO

Average rainfall days - St. Louis, MO

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
St. Louis, MO

Average snowfall - St. Louis, MO

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
St. Louis, MO

Average snowfall days - St. Louis, MO

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 / Average sunshine
St. Louis, MO

Average daylight / Average sunshine - St. Louis, MO

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).

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
St. Louis, MO

Average UV index - St. Louis, MO

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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