St. Louis, MO - Detailed climate information and monthly weather forecast

Frequently asked questions
Average temperature
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average UV index

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%.

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Long-term

Climate J F M A M J J A S O N D Year

Average high temperature in January:
4.4°C
Average high temperature in February:
7.2°C
Average high temperature in March:
13.3°C
Average high temperature in April:
19.7°C
Average high temperature in May:
24.6°C
Average high temperature in June:
29.5°C

Average high temperature in July:
31.7°C
Average high temperature in August:
31.1°C
Average high temperature in September:
26.8°C
Average high temperature in October:
20.3°C
Average high temperature in November:
13.1°C
Average high temperature in December:
5.8°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is January (4.4°C).

Average low temperature in January:
-4.6°C
Average low temperature in February:
-2.4°C
Average low temperature in March:
2.6°C
Average low temperature in April:
8.4°C
Average low temperature in May:
14°C
Average low temperature in June:
19.3°C

Average low temperature in July:
21.7°C
Average low temperature in August:
20.8°C
Average low temperature in September:
15.9°C
Average low temperature in October:
9.4°C
Average low temperature in November:
3.4°C
Average low temperature in December:
-2.8°C

The month with the highest average low temperature is July (21.7°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

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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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The wettest month (with the highest rainfall) is May (119.9mm).
The driest month (with the lowest rainfall) is February (56.9mm).

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Average rainfall days in January:
8.9 days
Average rainfall days in February:
8 days
Average rainfall days in March:
10.3 days
Average rainfall days in April:
11.3 days
Average rainfall days in May:
11.9 days
Average rainfall days in June:
10 days

Average rainfall days in July:
8.9 days
Average rainfall days in August:
8.2 days
Average rainfall days in September:
7.4 days
Average rainfall days in October:
8.7 days
Average rainfall days in November:
9.6 days
Average rainfall days in December:
9.4 days

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).

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

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Average snowfall days in January:
4.7 days
Average snowfall days in February:
3.4 days
Average snowfall days in March:
1.7 days
Average snowfall days in April:
0.3 days
Average snowfall days in May:
0 days
Average snowfall days in June:
0 days

Average snowfall days in July:
0 days
Average snowfall days in August:
0 days
Average snowfall days in September:
0 days
Average snowfall days in October:
0 days
Average snowfall days in November:
0.7 days
Average snowfall days in December:
3.7 days

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).

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