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
January, like December, in St. Louis is a wintry winter month, with average temperature varying between 39.9°F (4.4°C) and 23.7°F (-4.6°C). 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. Weather in January »

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 in February is practically the same as in January - a frosty 45°F (7.2°C). Weather in February »

March, the first month of the spring, in St. Louis, is a moderate month, with average temperature varying between 36.7°F (2.6°C) and 55.9°F (13.3°C). In St. Louis, the average high-temperature rises, from a chilly 45°F (7.2°C) in February, to a mild 55.9°F (13.3°C). Weather in March »

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

May, the last month of the spring, in St. Louis, is a warm month, with average temperature fluctuating between 76.3°F (24.6°C) and 57.2°F (14°C). In May, the average high-temperature in St. Weather in May »

June, the first month of the summer, in St. Louis, is also a moderately hot month, with temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 85.1°F (29.5°C). In June, the average high-temperature in St. Weather in June »

July is a hot summer month in St. Louis, with average temperature fluctuating between 71.1°F (21.7°C) and 89.1°F (31.7°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). In July, the average heat index is calculated to a torrid 102°F (38.9°C). Weather in July »

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

The first month of the autumn, September, is still a warm month in St. Louis, with average temperature varying between 80.2°F (26.8°C) and 60.6°F (15.9°C). In St. Louis, the average high-temperature in September marginally drops, from a hot 88°F (31.1°C) in August, to a warm 80.2°F (26.8°C). Weather in September »

October, like September, is another pleasant autumn month in St. Louis, with average temperature varying between 68.5°F (20.3°C) and 48.9°F (9.4°C). In St. Louis, Missouri, the average high-temperature in October drops, from a warm 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 average temperature ranging between max 55.6°F (13.1°C) and min 38.1°F (3.4°C). In St. Louis, the average high-temperature in November decreases, from an agreeable 68.5°F (20.3°C) in October, to a mild 55.6°F (13.1°C). Weather in November »

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

What is the coldest month in St. Louis?

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).

How many days does it rain in St. Louis?

In St. Louis, 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, Missouri, 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.

When does it snow the most in St. Louis?

The month with the most snowfall is January when snow falls for 4.7 days and typically aggregates up to 5.6" (142.2mm) of snow.

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

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

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 2.24" (56.9mm) of precipitation.

What is the least humid month in St. Louis?

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

What is the wettest 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 4.72" (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, 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.

What is the warmest month in St. Louis?

July is the warmest month in St. Louis, Missouri, 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?

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

What is the most humid month in St. Louis?

December is the most humid month in St. Louis, 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 is December, with an average of 9.5h of daylight.

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

December has the least sunshine of the year, 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
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 least snowfall days are May, June, July, August, September and October (0 days).

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).