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. 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

Observing a rise in March, the average high-temperature in St. Louis goes from February's chilly 45°F to a refreshing 55.9°F. Throughout the month of March, St. Louis sees a steady low-temperature average of 36.7°F.

Humidity

The average relative humidity in March in St. Louis, Missouri, is 68.3%.

Rainfall

In St. Louis, in March, during 10.3 rainfall days, 3.31" of precipitation is typically accumulated. Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.94" of precipitation is accumulated.

Snowfall

Months with snowfall in St. Louis are January through April, November and December. In St. Louis, during March, snow falls for 1.7 days and regularly aggregates up to 2.28" 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 March in St. Louis, Missouri, is 11h and 59min.
On the first day of March in St. Louis, sunrise is at 6:32 am and sunset at 5:53 pm CST. On the last day of the month, sunrise is at 6:46 am and sunset at 7:22 pm CDT.
Note: On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time lasts until Sunday, November 5. 2023, 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 value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 5 during March translates into these guidelines:
Guard yourself - Precautionary measures against sun damage are advocated. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Always opt for UVA and UVB-resistant sunglasses on radiant days. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.