March in Maryland Heights is the rainiest month of the year. In March, the weather in Maryland Heights is typically warm. Average daily high temperature in March is about 12 degrees above zero. On average, Maryland Heights has 13 rainy, 8 sunny, 6 partly cloudy, and 4 cloudy days in March. The rains are usually heavy. March as well as January, February, and December is considered the most uncomfortable time to visit Maryland Heights.