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, the same as December, is a wintry winter month in St. Louis, with average temperature ranging between min 23.7°F (-4.6°C) and max 39.9°F (4.4°C). The coldest month in St. Louis, Missouri, 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 »

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

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

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

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

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

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

August, the last month of the summer, in St. Louis, is another tropical month, with average temperature varying 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 fluctuating 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 »

October, like September, is another pleasant 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 October, the average high-temperature in St. Weather in October »

The last month of the autumn, November, is another mild month in St. Louis, with average temperature varying between 38.1°F (3.4°C) and 55.6°F (13.1°C). In St. Louis, Missouri, the average high-temperature in November decreases, from a pleasant 68.5°F (20.3°C) in October, to a mild 55.6°F (13.1°C). Weather in November »

December, the first month of the winter, in St. Louis, is also a wintry month, with average temperature varying between 42.4°F (5.8°C) and 27°F (-2.8°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 in St. Louis.

How many days does it rain in St. Louis?

Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.96" (1040.3mm) of precipitation is accumulated.

When does it snow in St. Louis?

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

How many days does it snow in St. Louis?

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

When does it snow the most in St. Louis?

January is the month with the most snowfall in St. Louis, Missouri. 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 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.

What is the least humid month in St. Louis?

The least humid month in St. Louis, Missouri, 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?

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 14.8h of daylight.

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 in St. Louis.

What 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), July is the warmest month in St. Louis.

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 in St. Louis, Missouri.

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

December has the shortest days of the year, 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 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).

Average rainfall days - 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).

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).