Weather in April
Temperature
In April, the average high-temperature in St. Louis increases from a moderate 55.9°F (13.3°C) in March to a comfortable 67.5°F (19.7°C). The average low-temperature, in April, in St. Louis, is 47.1°F (8.4°C).Humidity
The least humid month in St. Louis is April, with an average relative humidity of 63.5%.Rainfall
In April, in St. Louis, Missouri, the rain falls for 11.3 days. Throughout April, 3.7" (94mm) of precipitation is accumulated. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.94" (1040mm) of precipitation.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 0.39" (10mm) of snow. Throughout the year, in St. Louis, there are 14.5 snowfall days, and 17.72" (450mm) of snow is accumulated.Daylight
In April, the average length of the day 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, Missouri, 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 threat to health from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 7 in April transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
FAQ
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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).
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: 3.7"
The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").
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).
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").
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).
Average daylight in April /
Average sunshine in April
St. Louis, MO
- Average daylight in April: 13h and 1min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in April: 7h and 3min
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).
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).
Weather forecast for your location
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