April weather forecast
St. Louis, MO

April in St. Louis signifies the full-fledged arrival of spring. A significant improvement in weather conditions becomes evident with the mean temperature increasing substantially. The temperature ranges from 47.2°F (8.4°C), warming the day considerably. April carries an increased likelihood of precipitation, bringing an average of more than 11 rainfall days. The citizens anticipate an enhancing panorama of spring vistas under increasing daylight hours.

Temperature

St. Louis's transition into April is marked by a temperature shift, moving from a mild 55.9°F (13.3°C) in March to a still refreshing 67.5°F (19.7°C). In April, St. Louis's temperature tends to fall to an average low of 47.1°F (8.4°C) during the night.

Humidity

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

Rainfall

In St. Louis, in April, during 11.3 rainfall days, 3.7" (94mm) of precipitation is typically accumulated. Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.94" (1040mm) 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, Missouri. During 0.3 snowfall days, in April, St. Louis aggregates 0.39" (10mm) of snow. Throughout the year, in St. Louis, Missouri, there are 14.5 snowfall days, and 17.72" (450mm) of snow is accumulated.

Daylight

The average length of the day in April in St. Louis, Missouri, is 13h and 14min.
On the first day of April in St. Louis, sunrise is at 6:44 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 7:52 pm CDT.

Sunshine

In St. Louis, the average sunshine in April 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 health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A daily high UV index of 7 in April leads to these guidelines:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.