March weather forecast
Boulder, CO

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The old building of the University of Colorado in Boulder, Colorado
The old building of the University of Colorado in Boulder, Colorado

Weather in March

March signifies the advent of spring in Boulder, instigating a marked shift in climate. Temperatures start to climb, establishing the basis for the ensuing warmer months. This month receives maximum snowfall of about 6.26" (159mm), marking the last significant flurry before the arrival of summer. The subsequent month of April will introduce an impactful switch in climate, with reduced snowfall and increased rainfall. Hence, March functions as a critical juncture, concluding winter and paving the way for spring.

Temperature

March's onset in Boulder brings a rise in the average high-temperature, moving from a wintry 36.1°F (2.3°C) in February to a chilly 46.4°F (8°C). Boulder, during the nights of March, experiences an average temperature drop to a freezing cold 26.1°F (-3.3°C).

Humidity

The average relative humidity in March in Boulder is 61%.

Rainfall

In Boulder, in March, it is raining for 9.3 days, with typically 1.14" (29mm) of accumulated precipitation. Throughout the year, there are 117.3 rainfall days, and 14.17" (360mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Boulder, in March, during 6.1 snowfall days, 6.26" (159mm) of snow is typically accumulated. In Boulder, during the entire year, snow falls for 44.8 days and aggregates up to 37.01" (940mm) of snow.

Daylight

In Boulder, the average length of the day in March is 11h and 59min.
On the first day of March, sunrise is at 6:32 am and sunset at 5:53 pm MST. On the last day of the month, sunrise is at 6:45 am and sunset at 7:24 pm MDT.
Note: On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time lasts until Sunday, November 3. 2024, at 2:00 am; consequently, the time zone reverts from MDT to MST.

Sunshine

In Boulder, the average sunshine in March is 8.7h.

UV index

In Boulder, the average daily maximum UV index in March is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 3 during March translates into these guidelines:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Boulder in March?

Boulder in March has an average high-temperature of 46.4°F (8°C) and an average low-temperature of 26.1°F (-3.3°C).

What is the average humidity in March in Boulder?

The average relative humidity in March in Boulder is 61%.

How much does it rain in Boulder in March?

In March, in Boulder, the rain falls for 9.3 days. Throughout March, 1.14" (29mm) of precipitation is accumulated.

How much does it snow in Boulder in March?

In Boulder, Colorado, in March, during 6.1 snowfall days, 6.26" (159mm) of snow is typically accumulated.

How many hours of daylight does Boulder have in March?

In March, the average day length is 11h and 59min.

What time are sunrise and sunset in March in Boulder?

On the first day of March in Boulder, sunrise is at 6:32 am and sunset at 5:53 pm MST. On the last day of the month, sunrise is at 6:45 am and sunset at 7:24 pm MDT.

When does Daylight Saving Time (DST) start in March in Boulder?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. DST ends Sunday, November 3. 2024, at 2:00 am.

How long on average sun shines in March in Boulder?

In Boulder, the average sunshine duration in March is 8.7h.

How high is the UV index in March in Boulder?

In March, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in March
Boulder, CO

Average temperature in March - Boulder, CO
  • Average high temperature in March: 46.4°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is December (35.2°F).

  • Average low temperature in March: 26.1°F

The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is February (18°F).

Average pressure in March
Boulder, CO

Average pressure in March - Boulder, CO
  • Average pressure in March: 30"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April, May and June (29.92"Hg).

Average wind speed in March
Boulder, CO

Average wind speed in March - Boulder, CO
  • Average wind speed in March: 6.9mph

The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest months (with the lowest average wind speed) are May, July, August and September (5.7mph).

Average humidity in March
Boulder, CO

Average humidity in March - Boulder, CO
  • Average humidity in March: 61%

The month with the highest relative humidity is February (70%).
The months with the lowest relative humidity are June, August and September (45%).

Average rainfall in March
Boulder, CO

Average rainfall in March - Boulder, CO
  • Average rainfall in March: 1.14"

The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.39").

Average rainfall days in March
Boulder, CO

Average rainfall days in March - Boulder, CO
  • Average rainfall days in March: 9.3 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (3.3 days).

Average snowfall in March
Boulder, CO

Average snowfall in March - Boulder, CO
  • Average snowfall in March: 6.26"

The month with the highest snowfall is April (7.76").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in March
Boulder, CO

Average snowfall days in March - Boulder, CO
  • Average snowfall days in March: 6.1 days

The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in March /
Average sunshine in March
Boulder, CO

Average daylight in March / Average sunshine in March - Boulder, CO
  • Average daylight in March: 12h and 0min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in March: 8h and 4min

The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).

Average sunshine days in March
Boulder, CO

Average sunshine days in March - Boulder, CO
  • Average sunshine days in March: 17.1 days

The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is July (9.9 days).

Average UV index in March
Boulder, CO

Average UV index in March - Boulder, CO
  • Average UV index in March: 3

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in March
Boulder, CO

Average cloud cover in March - Boulder, CO
  • Average cloud cover in March: 25

The months with the most cloud cover are April and May (Cloud cover 28).
The month with the least cloud cover is September (Cloud cover 16).

Average visibility in March
Boulder, CO

Average visibility in March - Boulder, CO
  • Average visibility in March: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Boulder, Colorado, USA

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