April 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

Weather in April

April is a comfortable spring month in St. Louis, with average temperature fluctuating between 47.1°F (8.4°C) and 67.5°F (19.7°C).

Temperature

In April, the average high-temperature in St. Louis, Missouri, increases, from a mild 55.9°F (13.3°C) in March, to an enjoyable 67.5°F (19.7°C). The average low-temperature, in April, in St. Louis, is 47.1°F (8.4°C).

Humidity

With an average relative humidity of 63.5%, April is the least humid month in St. Louis, Missouri.

Rainfall

In St. Louis, during 11.3 rainfall days, 3.69" (93.7mm) 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

Months with snowfall in St. Louis are January through April, November and December. April is the last month it regularly snows in St. Louis. During 0.3 snowfall days, St. Louis aggregates 0.4" (10.2mm) of snow. In St. Louis, during the entire year, snow falls for 14.5 days, and aggregates up to 17.7" (449.6mm) of snow.

Daylight

In April, the average length of the day in St. Louis, Missouri, is 13.3h.

Sunshine

In April, the average sunshine in St. Louis is 7.5h.

UV index

In April, the average daily maximum UV index in St. Louis is 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in April transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

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 average humidity in April in St. Louis?

In St. Louis, the average relative humidity in April is 63.5%.

How much does it rain in St. Louis in April?

In April, in St. Louis, the rain falls for 11.3 days. Throughout April, 3.69" (93.7mm) of precipitation is accumulated.

What is the last month it snows in St. Louis?

April is the last month it regularly snows. During 0.3 snowfall days, in April, St. Louis aggregates 0.4" (10.2mm) of snow.

What is the average length of the day in April in St. Louis?

The average length of the day in April in St. Louis is 13.3h.

How long on average sun shines in April in St. Louis?

In St. Louis, Missouri, the average sunshine in April is 7.5h.

What is the UV index intensity in April in St. Louis?

In St. Louis, the average daily maximum UV index in April is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in April
St. Louis, MO

Average temperature in April - St. Louis, MO
  • Average high temperature in April: 19.7°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 April: 8.4°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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Average humidity in April
St. Louis, MO

Average humidity in April - St. Louis, MO
  • Average humidity in April: 63.5%

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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Average rainfall in April
St. Louis, MO

Average rainfall in April - St. Louis, MO
  • Average rainfall in April: 93.7mm

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

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Average rainfall days in April
St. Louis, MO

Average rainfall days in April - St. Louis, MO
  • Average rainfall days in April: 11.3 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).

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Average snowfall in April
St. Louis, MO

Average snowfall in April - St. Louis, MO
  • Average snowfall in April: 10.2mm

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

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Average snowfall days in April
St. Louis, MO

Average snowfall days in April - St. Louis, MO
  • Average snowfall days in April: 0.3 days

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).

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

Average daylight in April / Average sunshine in April - St. Louis, MO
  • Average daylight in April: 13.3h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in April: 7.5h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is December (Average sunshine: 4.2h).

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Average UV index in April
St. Louis, MO

Average UV index in April - St. Louis, MO
  • Average UV index in April: 7

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

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