April 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 temperature in April in St. Louis?

In St. Louis, in April, the average high-temperature is 67.5°F (19.7°C), and the average low-temperature is 47.1°F (8.4°C).

What is the least humid month in St. Louis?

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

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

The average relative humidity in April in St. Louis, Missouri, is 63.5%.

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

In St. Louis, Missouri, in April, during 11.3 rainfall days, 3.7" (93.7mm) of precipitation is typically 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 UV index in April in St. Louis?

The average UV index in April in St. Louis is 7.
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).

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%).

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 lowest rainfall) is February (56.9mm).

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 lowest number of rainy days is September (7.4 days).

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 lowest snowfall are May, June, July, August, September and October (0mm).

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 lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in April / Average sunshine in April - St. Louis, MO
  • Average daylight in April: 13.2h

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

  • Average sunshine in April: 7.5h

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

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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