January weather forecast
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

Weather in January

January, like December, in St. Louis is a wintry winter month, with temperature in the range of an average low of 23.7°F (-4.6°C) and an average high of 39.9°F (4.4°C).

Temperature

January 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).

Humidity

The average relative humidity in January in St. Louis is 73%.

Rainfall

In St. Louis, during 8.9 rainfall days, 2.4" (61mm) of precipitation is typically accumulated. Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.96" (1040.3mm) of precipitation is accumulated.

Snowfall

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

Daylight

In St. Louis, the average length of the day in January is 9h and 50min.
On the first day of January in St. Louis, sunrise is at 7:18 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:21 pm CST.

Sunshine

In January, the average sunshine in St. Louis, Missouri, is 5.2h.

UV index

The months with the lowest UV index in St. Louis are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

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, Missouri.

What is the average humidity in January in St. Louis?

The average relative humidity in January in St. Louis, Missouri, is 73%.

How many days does it rain in January in St. Louis?

In St. Louis, Missouri, during January, the rain falls for 8.9 days and regularly aggregates up to 2.4" (61mm) of precipitation.

What is the snowiest month 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.

How much does it snow in St. Louis in January?

In St. Louis, Missouri, in January, during 4.7 snowfall days, 5.6" (142.2mm) of snow is typically accumulated.

How many hours of daylight does St. Louis have in January?

The average day length in January in St. Louis is 9h and 50min.

What time are sunrise and sunset in January in St. Louis?

On the first day of January in St. Louis, sunrise is at 7:18 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:21 pm CST.

How many hours of sunshine does St. Louis have in January?

The average sunshine duration in January is 5.2h.

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

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

How high is the UV index in January in St. Louis?

The average daily maximum UV index in January in St. Louis is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average UV index

Average temperature in January
St. Louis, MO

Average temperature in January - St. Louis, MO
  • Average high temperature in January: 39.9°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in January: 23.7°F

The month with the highest average low temperature is July (71°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

[Resources]

Average humidity in January
St. Louis, MO

Average humidity in January - St. Louis, MO
  • Average humidity in January: 73%

The month with the highest relative humidity is December (75.8%).
The month with the lowest relative humidity is April (63.5%).

[Resources]

Average rainfall in January
St. Louis, MO

Average rainfall in January - St. Louis, MO
  • Average rainfall in January: 2.4"

The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").

[Resources]

Average rainfall days in January
St. Louis, MO

Average rainfall days in January - St. Louis, MO
  • Average rainfall days in January: 8.9 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is September (7.4 days).

[Resources]

Average snowfall in January
St. Louis, MO

Average snowfall in January - St. Louis, MO
  • Average snowfall in January: 5.6"

The month with the highest snowfall is January (5.6").
The months with the least snowfall are May, June, July, August, September and October (0").

[Resources]

Average snowfall days in January
St. Louis, MO

Average snowfall days in January - St. Louis, MO
  • Average snowfall days in January: 4.7 days

The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average daylight in January /
Average sunshine in January
St. Louis, MO

Average daylight in January / Average sunshine in January - St. Louis, MO
  • Average daylight in January: 9h and 50min

The month with the longest days is June (Average daylight: 14h and 49min).
The month with the shortest days is December (Average daylight: 9h and 31min).

  • Average sunshine in January: 5h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

[Resources]

Average UV index in January
St. Louis, MO

Average UV index in January - St. Louis, MO
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 9).
The months with the lowest UV index are January and December (UV index 2).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location