March weather forecast
St. Louis, MO

March, the first month of the spring in St. Louis, is a moderate month, with an average temperature varying between 36.7°F (2.6°C) and 55.9°F (13.3°C).

Temperature

In St. Louis, the average high-temperature in March rises from a chilly 45°F (7.2°C) in February to a mild 55.9°F (13.3°C). The average low-temperature, in March, in St. Louis, is 36.7°F (2.6°C).

Humidity

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

Rainfall

In March, in St. Louis, the rain falls for 10.3 days. Throughout March, 3.31" (84mm) 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. In St. Louis, during 1.7 snowfall days, 2.28" (58mm) of snow is typically accumulated. Throughout the year, in St. Louis, there are 14.5 snowfall days, and 17.72" (450mm) of snow is accumulated.

Daylight

In St. Louis, the average length of the day in March is 11h and 59min.
On the first day of the month, sunrise is at 6:32 am and sunset at 5:53 pm CST. On the last day of March, in St. Louis, Missouri, 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 St. Louis, the average sunshine in March is 6.4h.

UV index

In St. Louis, the average daily maximum UV index in March is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 5 in March transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.