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, 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

April's onset in St. Louis witnesses a shift in the average high-temperature, moving from 55.9°F in March to a still refreshing 67.5°F. Throughout the nights in April, an average low-temperature of 47.1°F is noted in St. Louis.

Humidity

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

Rainfall

In St. Louis, in April, during 11.3 rainfall days, 3.7" of precipitation is typically accumulated. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.94" 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. During 0.3 snowfall days, in April, St. Louis aggregates 0.39" of snow. In St. Louis, during the entire year, snow falls for 14.5 days and aggregates up to 17.72" of snow.

Daylight

The average length of the day in April in St. Louis is 13h and 14min.
On the first day of April in St. Louis, sunrise is at 6:45 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:04 am and sunset at 7:51 pm CDT.

Sunshine

The average sunshine in April in St. Louis is 7.5h.

UV index

In April, the average daily maximum UV index in St. Louis, Missouri, is 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: In April, the maximum UV index of 7 translates into these guidelines:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.