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

St. Louis, Missouri, experiences a temperature shift with the start of March, with average high-temperatures moving from a chilly 45°F (7.2°C) in February to a moderate 55.9°F (13.3°C). During March, St. Louis's temperature falls to a steady low-temperature average of 36.7°F (2.6°C).

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. Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.94" (1040mm) of precipitation is accumulated.

Snowfall

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

Daylight

In March, the average length of the day in St. Louis is 11h and 59min.
On the first day of March in St. Louis, sunrise is at 6:31 am and sunset at 5:54 pm CST. On the last day of the month, 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

The average sunshine in March in St. Louis is 6.4h.

UV index

In St. Louis, Missouri, the average daily maximum UV index in March is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In March, a regular UV index of 5 translates into these guidelines:
Undertake precautions - It is suggested to shield oneself from sunburn. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.