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

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 41" (1040.3mm) of precipitation.

When does it snow in St. Louis?

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

How much 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 is the snowiest month 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 is the month with the lowest UV index in St. Louis?

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

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 2.2" (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?

May is the month with the most rainfall. Rain falls for 11.9 days and accumulates 4.7" (119.9mm) of precipitation.

What is the month with the highest UV index in St. Louis?

Months with the highest UV index in St. Louis are June through August, with an average UV index of 9.

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 is the most humid month in St. Louis?

December is the most humid month, with an average relative humidity of 75.8%.
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 lowest rainfall) is February (56.9mm).

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

The month with the highest snowfall is January (142.2mm).
Months with the lowest 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 lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight / Average sunshine - St. Louis, MO
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