April 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 April

April in St. Louis is an enjoyable spring month, with an average temperature ranging between max 67.5°F (19.7°C) and min 47.1°F (8.4°C).

Temperature

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

Rainfall

In St. Louis, Missouri, during April, the rain falls for 11.3 days and regularly aggregates up to 3.69" (93.7mm) of precipitation. In St. Louis, Missouri, during the entire year, the rain falls for 112.6 days and collects up to 40.96" (1040.3mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in St. Louis. April is the last month it regularly snows in St. Louis, Missouri. During 0.3 snowfall days, St. Louis aggregates 0.4" (10.2mm) of snow. Throughout the year, in St. Louis, there are 14.5 snowfall days, and 17.7" (449.6mm) of snow is accumulated.

Daylight

In St. Louis, the average length of the day in April is 13h and 14min.
On the first day of the month, sunrise is at 6:45 am and sunset at 7:24 pm. On the last day of April, in St. Louis, sunrise is at 6:04 am and sunset at 7:51 pm CDT.

Sunshine

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

UV index

The average daily maximum UV index in April in St. Louis is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In April, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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?

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

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

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

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

In St. Louis, Missouri, in April, during 11.3 rainfall days, 3.69" (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.

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

The average day length in April in St. Louis, Missouri, is 13h and 14min.

When is the sunrise / sunset in April in St. Louis?

On the first day of April, sunrise is at 6:45 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:04 am and sunset at 7:51 pm CDT.

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

The average sunshine duration in April is 7.5h.

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

The average daily maximum UV index in April in St. Louis, Missouri, is 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average UV index

Average temperature in April
St. Louis, MO

Average temperature in April - St. Louis, MO
  • Average high temperature in April: 67.4°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 April: 47.2°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).

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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: 3.7"

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

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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: 0.4"

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").

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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).
The 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: 13h and 14min

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 April: 7h and 30min

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).

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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

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).

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