March weather forecast
St. Louis, MO

March is characteristic of transitional weather in St. Louis, Missouri. The mercury level steadily rises, hinting at the forthcoming arrival of spring. This month sees a significant jump in average temperatures to 36.6°F (2.6°C). The snowfall finally dwindles, signaling the end of the winter season. Consequently, the transformation from winter to spring presages an environment full of blooming flora and warming weather.

Temperature

With the beginning of March, St. Louis's average high-temperature sees an increase, transitioning from a frosty 45°F (7.2°C) in February to a mild 55.9°F (13.3°C). Throughout March, an average nighttime temperature of 36.7°F (2.6°C) is experienced in St. Louis.

Humidity

In March, the average relative humidity in St. Louis is 68.3%.

Rainfall

In St. Louis, during March, the rain falls for 10.3 days and regularly aggregates up to 3.31" (84mm) of precipitation. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.94" (1040mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in St. Louis. In St. Louis, in March, during 1.7 snowfall days, 2.28" (58mm) of snow is typically accumulated. In St. Louis, during the entire year, snow falls for 14.5 days and aggregates up to 17.72" (450mm) of snow.

Daylight

In March, the average length of the day in St. Louis is 11h and 59min.
On the first day of the month, sunrise is at 6:31 am and sunset at 5:54 pm CST. On the last day of March, in St. Louis, sunrise is at 6:45 am and sunset at 7:23 pm CDT.
Note: On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time lasts until Sunday, November 3. 2024, at 2:00 am; consequently, the time zone reverts from CDT to CST.

Sunshine

In March, the average sunshine in St. Louis is 6.4h.

UV index

In March, the average daily maximum UV index in St. Louis is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: In March, the UV index of 5 transforms into the following advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.