March weather forecast
St. Louis, MO

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A beautiful twilight over the Gateway Arch in St. Louis, Missouri
A beautiful twilight over the Gateway Arch in St. Louis, Missouri

Weather in March

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.
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FAQ

What are the temperatures in St. Louis in March?

The average high-temperature and low-temperature in St. Louis, Missouri, during March are 55.9°F and 36.7°F respectively.

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

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

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

In St. Louis, Missouri, during March, the rain falls for 10.3 days and regularly aggregates up to 3.31" of precipitation.

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

In March, it is snowing for 1.7 days. Throughout March, 2.28" of snow is accumulated.

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

The average day length in March is 11h and 59min.

What time are sunrise and sunset in March in St. Louis?

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.

When does Daylight Saving Time (DST) start in March in St. Louis?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in St. Louis, and the time zone changes from CST to CDT. DST ends Sunday, November 5. 2023, at 2:00 am.

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

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

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

The average daily maximum UV index in March is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in March
St. Louis, MO

Average temperature in March - St. Louis, MO
  • Average high temperature in March: 55.9°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in March: 36.6°F

The month with the highest average low temperature is July (71°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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Average humidity in March
St. Louis, MO

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%).

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Average rainfall in March
St. Louis, MO

Average rainfall in March - St. Louis, MO
  • Average rainfall in March: 3.3"

The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").

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Average rainfall days in March
St. Louis, MO

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).

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Average snowfall in March
St. Louis, MO

Average snowfall in March - St. Louis, MO
  • Average snowfall in March: 2.3"

The month with the highest snowfall is January (5.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in March
St. Louis, MO

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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in March /
Average sunshine in March
St. Louis, MO

Average daylight in March / Average sunshine in March - St. Louis, MO
  • Average daylight in March: 12h and 0min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in March: 6h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

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Average UV index in March
St. Louis, MO

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

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

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St. Louis, Missouri, USA

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