Monthly 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 January

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

Weather in February

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

Weather in March

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

Weather in April

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

Weather in May

May, the last month of the spring, in St. Louis, is a warm month, with average temperature varying between 57.2°F (14°C) and 76.3°F (24.6°C). In St. Louis, the average high-temperature slightly increases, from a comfortable 67.5°F (19.7°C) in April, to a moderately hot 76.3°F (24.6°C). Weather in May »

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). 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). Weather in June »

Weather in July

July in St. Louis is a hot summer month, with average temperature varying between 89.1°F (31.7°C) and 71.1°F (21.7°C). July is the warmest month in St. Louis, with an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C). 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 also a hot month in St. Louis, with average temperature fluctuating between 88°F (31.1°C) and 69.4°F (20.8°C). In St. Louis, the average high-temperature in August is essentially the same as in July - a still tropical 88°F (31.1°C). Weather in August »

Weather in September

September, the first month of the autumn, in St. Louis, is still a warm month, with average temperature varying between 80.2°F (26.8°C) and 60.6°F (15.9°C). In September, the average high-temperature in St. Weather in September »

Weather in October

October, like September, is an agreeable autumn month in St. Louis, with temperature in the range of an average low of 48.9°F (9.4°C) and an average high of 68.5°F (20.3°C). In St. Weather in October »

Weather in November

The last month of the autumn, November, is also a moderate month in St. Louis, with 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 also a wintry month, with average temperature ranging between min 27°F (-2.8°C) and max 42.4°F (5.8°C). In St. Louis, the average high-temperature drops, from a moderate 55.6°F (13.1°C) in November, to a wintry 42.4°F (5.8°C). Weather in December »
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FAQ

What is the coldest month in St. Louis?

January 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).

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?

January through April, November and December are months with snowfall.

When does it snow the most in St. Louis?

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

How much does it snow in St. Louis?

In St. Louis, Missouri, during the entire year, snow falls for 14.5 days, and aggregates up to 17.7" (449.6mm) of snow.

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

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

What is the driest month in St. Louis?

The month with the least rainfall is February when the rain falls for 8 days and typically collects 2.24" (56.9mm) of precipitation.

What is the least humid month in St. Louis?

The least humid month is April, with an average relative humidity of 63.5%.

What is the wettest month in St. Louis?

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

When it does not snow in St. Louis?

May through October are months without snowfall.

When are the longest days in St. Louis?

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

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 warmest month in St. Louis?

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).

What month has the most sunshine in St. Louis?

With an average of 10h of sunshine, July has the most sunshine of the year in St. Louis, Missouri.

What is the most humid month in St. Louis?

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

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

The month with the shortest days in St. Louis, Missouri, is December, with an average of 9.5h 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, Missouri.

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

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

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

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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