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

Monthly 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
January, like December, in St. Louis is a wintry winter month, with average temperature ranging between max 39.9°F (4.4°C) and min 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 »
The last month of the winter, February, is a frosty month in St. Louis, with temperature in the range of an average high of 45°F (7.2°C) and an average low of 27.7°F (-2.4°C). In St. Weather in February »

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

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

May, the last month of the spring, in St. Louis, is a moderately hot month, with average temperature ranging between max 76.3°F (24.6°C) and min 57.2°F (14°C). In St. Louis, the average high-temperature in May 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 »

The first month of the summer, June, is still a warm month in St. Louis, with average temperature varying between 66.7°F (19.3°C) and 85.1°F (29.5°C). In St. Louis, the average high-temperature marginally rises, from 76.3°F (24.6°C) in May, to a still warm 85.1°F (29.5°C). Weather in June »

July is a tropical summer month in St. Louis, with average temperature ranging between min 71.1°F (21.7°C) and max 89.1°F (31.7°C). With an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C), July is the warmest month in St. Weather in July »

The last month of the summer, August, is also a hot month in St. Louis, with average temperature fluctuating between 69.4°F (20.8°C) and 88°F (31.1°C). In August, the average high-temperature in St. Weather in August »

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

October, like September, is an agreeable autumn month in St. Louis, with average temperature ranging between min 48.9°F (9.4°C) and max 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 »

November, the last month of the autumn, in St. Louis, is also a moderate month, with temperature in the range of an average high of 55.6°F (13.1°C) and an average low of 38.1°F (3.4°C). In St. Weather in November »

The first month of the winter, December, is still a cold month in St. Louis, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 42.4°F (5.8°C). In December, the average high-temperature in St. Weather in December »

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.

How much does it rain in St. Louis?

Throughout the year, in St. Louis, Missouri, there are 112.6 rainfall days, and 41" (1040.3mm) of precipitation is accumulated.

When does it snow in St. Louis?

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

How much does it snow in St. Louis?

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

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.

When is the lowest UV index in St. Louis?

Months with the lowest UV index 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. Rain falls for 8 days and accumulates 2.2" (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 rainiest month in St. Louis?

The month with the most rainfall is May when the rain falls for 11.9 days and typically aggregates up to 4.7" (119.9mm) of precipitation.

When are the longest days in St. Louis?

June has the longest days of the year in St. Louis, with an average of 14.8h 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 in St. Louis 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?

The month with the most sunshine in St. Louis is July, with an average of 10h of sunshine.

What is the most humid month in St. Louis?

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

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

With an average of 9.5h of daylight, December has the shortest days of the year in St. Louis, Missouri.

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

December has the least sunshine of the year in St. Louis, Missouri, with an average of 4.2h of sunshine.
Average temperature - St. Louis, MO
Average humidity - St. Louis, MO
Average rainfall - 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 lowest number of rainy days is September (7.4 days).

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

Average daylight / Average sunshine - St. Louis, MO