March weather forecast and climate
St. Louis, MO

A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
March, the first month of the spring, in St. Louis, is a moderate month, with average temperature ranging between max 55.9°F (13.3°C) and min 36.7°F (2.6°C).

Temperature

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

Humidity

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

Rainfall

In St. Louis, it is raining for 10.3 days, with typically 3.32" (84.3mm) of accumulated precipitation. Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.96" (1040.3mm) 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 2.3" (58.4mm) of snow. In St. Louis, during the entire year, snow falls for 14.5 days, and aggregates up to 17.7" (449.6mm) of snow.

Daylight

The average length of the day in St. Louis is 12h.

Sunshine

The average sunshine in St. Louis is 6.4h.

UV index

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 the exposure to the Sun's UV radiation for ordinary individuals.
Note: In March, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for 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.

What is the temperature in March in St. Louis?

In St. Louis, in March, the average high-temperature is 55.9°F (13.3°C), and the average low-temperature is 36.7°F (2.6°C).

What is the average humidity in March in St. Louis?

The average relative humidity in March is 68.3%.

How many days does it rain in March in St. Louis?

In March, in St. Louis, Missouri, the rain falls for 10.3 days. Throughout March, 3.32" (84.3mm) of precipitation is accumulated.

How many days does it snow in March in St. Louis?

In St. Louis, Missouri, in March, snow falls for 1.7 days, with typically accumulated 2.3" (58.4mm) of snow.

What is the average length of the day in March in St. Louis?

In St. Louis, the average length of the day in March is 12h.

How long on average sun shines in March in St. Louis?

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

What is the UV index reading in March in St. Louis?

The average daily maximum UV index in March in St. Louis is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in March - St. Louis, MO
  • Average high temperature in March: 13.3°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is January (4.4°C).

  • Average low temperature in March: 2.6°C

The month with the highest average low temperature is July (21.7°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

Average humidity in March - St. Louis, MO
  • Average humidity in March: 68.3%

The month with the highest relative humidity is December (75.8%).
The month with the lowest relative humidity is April (63.5%).

Average rainfall in March - St. Louis, MO
  • Average rainfall in March: 84.3mm

The wettest month (with the highest rainfall) is May (119.9mm).
The driest month (with the least rainfall) is February (56.9mm).

Average rainfall days in March - St. Louis, MO
  • Average rainfall days in March: 10.3 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is September (7.4 days).

Average snowfall in March - St. Louis, MO
  • Average snowfall in March: 58.4mm

The month with the highest snowfall is January (142.2mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in March - St. Louis, MO
  • Average snowfall days in March: 1.7 days

The month with the highest number of snowfall days is January (4.7 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in March / Average sunshine in March - St. Louis, MO
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in March: 6.4h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is December (Average sunshine: 4.2h).

Average UV index in March - St. Louis, MO
  • Average UV index in March: 5

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).