March Weather in National Harbor, United States

Last updated: February 24, 2025

March in National Harbor, United States, presents a dynamic weather profile characterized by a maximum temperature reaching 29°C (84°F) and an average of 8°C (47°F). While the month can start with cold spells, dipping to a minimum of -6°C (22°F), the warming trend marks a transition into spring. Despite the rising temperatures, precipitation remains notable, accumulating to 82 mm (3.2 inches) over 9 days, alongside high humidity levels around 83%. This blend of warmth and moisture creates a unique atmospheric experience, making March a month of transformation in National Harbor.

March Temperature in National Harbor

In March, National Harbor begins to shake off the chill of winter, with temperatures gradually rising and signaling the approach of spring. The month experiences a notable shift, with minimum temperatures rising to -6°C (22°F) and average highs reaching a pleasant 8°C (47°F), peaking at a warm 29°C (84°F) on sunnier days. This transition from the cooler winter months, where temperatures often dipped below -14°C (7°F) in January and February, illustrates a clear upward trend. As frost gives way to blooming flowers, March beckons residents and visitors alike to enjoy the outdoors, making it an increasingly inviting time in National Harbor.

March Weather in National Harbor: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in National Harbor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec374247576776817872634841
Data source: Temperature data for National Harbor generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

March Precipitation in National Harbor

In March, National Harbor experiences a blend of winter’s retreat and spring’s embrace, with precipitation totaling 82 mm (3.2 in) over 9 days. This month marks a slight decrease from February's 96 mm (3.8 in), hinting at a shift towards drier conditions as the year progresses. Despite the reduced rainfall, March still lays the groundwork for the impending lushness of spring, offering a refreshing transition that leads into April’s wetter tendencies, where precipitation climbs once again to 102 mm (4.0 in). The gentle patter of rain during this month contributes to the vibrant awakening of nature, setting the stage for the more abundant downpours of late spring and summer.

March Precipitation Trends in National Harbor

The chart displays monthly precipitation patterns in National Harbor, with values for each month alongside March's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec619682102121108132146931057789
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in National Harbor

As March unfolds in National Harbor, the humidity holds steady at 83%, mirroring the slight decrease observed in February. This level is consistent with the cooler winter months, showcasing a transition towards spring's gradual warming. The trends illustrate a slow decline in humidity as the year progresses, with April dipping further to 81% and May reaching 78%. This pattern suggests a shift towards drier conditions in the upcoming months, creating a refreshing contrast to the peak humidity experienced during the summer. As the seasons change, residents can anticipate a mild, yet steadily decreasing humidity that paves the way for more comfortable outdoor activities.

March Average Humidity in National Harbor

This chart illustrates the average monthly humidity levels in National Harbor, with March's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how March's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in National Harbor

As March arrives in National Harbor, the UV Index reaches a notable 7, marking a shift to a high exposure category. This increase from February’s 5 indicates that as spring approaches, sun safety becomes increasingly important; with a burn time of only 25 minutes, precautions are advised for outdoor activities. Typically, the UV Index will steadily rise throughout the coming months, peaking at 10 in June and July, emphasizing the need for protective measures as the bright summer days draw near. To stay informed and safe, check the current conditions and forecast details for the UV Index in National Harbor here.

Maximum UV Index Levels in National Harbor for March

The chart shows the monthly maximum UV Index (UVI) for National Harbor in March, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: National Harbor March UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

March Sunshine in National Harbor

As March arrives in National Harbor, the sun begins to shine brighter than in the earlier months, offering 259 hours of daylight—a significant increase from 180 hours reported in February. This upward trend continues into April, matching March's total, as locals and visitors alike start to embrace the burgeoning warmth. The springtime unlocks a steady progression toward longer days, culminating in May with an impressive 286 hours of sunshine. This gradual ascent in daylight not only marks the transition from winter’s chill but also heralds the vibrant activities and blooming landscapes that define the season, encouraging everyone to step outside and soak up the sun.

Monthly Sunshine Duration in National Harbor: March Highlighted

The March sunshine duration represents the total number of hours National Harbor experiences direct sunlight during the month of March, excluding cloudy or obstructed periods. This chart compares the sunshine duration of March with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec153h180h259h259h286h331h357h321h276h249h226h190h
Data source: National Harbor March Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in National Harbor During March

March in National Harbor, United States, welcomes milder temperatures and an increased likelihood of sunny weather, boasting a 52% chance of sunshine. This uptick follows the particularly overcast February, which saw a mere 29% chance of sunny days. As spring approaches, it becomes evident that March serves as a pivotal transition, outshining the winter months. While the sunny likelihood dips slightly in April to 49%, it remains significantly higher than January's 46% and February's dreariness. This trend highlights March as a promising month for those looking to enjoy the outdoors, paving the way for the sunnier days ahead in the warmer months.

Percentage of Sunny Days in March in National Harbor

The chart illustrates the percentage of sunny days in National Harbor throughout the year, with March highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often National Harbor experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%29%52%49%40%39%49%35%55%41%58%39%
Data source: National Harbor March chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in National Harbor in March

As March unfolds in National Harbor, the days grow noticeably longer, welcoming a steady increase in daylight that extends to 11 hours by month's end. This trend not only marks a shift from the 10 hours in February but also sets the stage for even more sunshine in the following months, with April bringing 13 hours of daylight. The gradual transition from winter to spring is a reminder of nature's rhythm, as each month builds upon the last, leading to the lush, sun-drenched days of summer. The elongation of daylight hours in March symbolizes renewal and the vibrant energy of the upcoming season, inviting residents and visitors alike to embrace the outdoors and enjoy the blooming beauty of their surroundings.

Average Daylight Hours in National Harbor for March

The chart illustrates the variation in daylight duration in National Harbor throughout the year, with March highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 47m10h 45m11h 58m13h 14m14h 18m14h 49m14h 32m13h 35m12h 23m11h 8m10h 2m9h 29m
Data source: National Harbor daylight hours, calculated by summing the hours between sunrise and sunset for each day.

March Winds in National Harbor

March in National Harbor sees a consistent average wind speed of 3.2 m/s (7 mph), mirroring the breezy conditions of February and maintaining the same pace into April. This stability in wind speed suggests a transitional period, as winter recedes and spring starts to unfurl its vibrant colors. Interestingly, throughout the year, wind speeds tend to decline, peaking early in the year before gradually softening, culminating in the calm of late summer. As the seasons shift, March offers a refreshing blend of invigorating breezes, perfect for outdoor activities and a reminder of nature's rhythmic cycles.

Average March Wind Speed in National Harbor

The chart displays monthly wind speed patterns in National Harbor, with values for each month shown alongside March's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how March's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.23.2 m/s3.22.82.52.31.92.52.72.92.8
Data source: National Harbor March wind data, generated using information from the Copernicus Climate Change Service.

How March Weather in National Harbor Compares to Other Months

The weather in National Harbor changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of March's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in National Harbor and find detailed weather information for every month.

When comparing the weather in January and March, it is evident that March experiences milder temperatures, with averages around 8°C (47°F) compared to January's chillier average of 3°C (38°F). While January sees more extreme lows, dropping to -14°C (7°F), March presents a wider temperature range, reaching max highs of 29°C (84°F). Additionally, March has slightly higher precipitation at 82 mm (3.2 in) over about 9 days, in contrast to January's 61 mm (2.4 in) over 7 days. Humidity remains similar between the two months, with January at 84% and March at 83%. For more details about the weather specific to January, you can visit National Harbor weather in January.

March and February present notable differences in weather conditions. March typically has a milder average temperature of 8°C (47°F), compared to February's chillier average of 5°C (42°F). The minimum temperature in March is also less severe at -6°C (22°F), while February can drop to a much colder -14°C (7°F). However, February experiences slightly more precipitation with 96 mm (3.8 in) over 11 days, while March sees 82 mm (3.2 in) over 9 days. Both months share the same humidity level of 83%, indicating they are equally humid despite the fluctuations in temperature. For more details on February weather, check out this link: National Harbor weather in February.

March and April exhibit notable differences in weather patterns. March has temperatures that range from a chilly minimum of -6°C (22°F) to a maximum of 29°C (84°F), with an average of 8°C (47°F) and experiencing 82 mm (3.2 in) of precipitation over 9 days. In contrast, April sees a milder temperature range, with a minimum of -1°C (31°F) and a maximum of 33°C (92°F), leading to a significantly higher average of 14°C (58°F). This month also has increased precipitation, totaling 102 mm (4.0 in) over 11 days, though humidity remains relatively similar at 81%. For a more detailed look at the weather in April, check out National Harbor weather in April.

The weather in March is characterized by cooler temperatures, with minimums dipping as low as -6°C (22°F) and an average around 8°C (47°F), while the maximum can reach 29°C (84°F). The month experiences moderate precipitation, with about 82 mm (3.2 in) falling over 9 days, and a relatively high humidity level of 83%. In contrast, May brings more warmth, featuring a minimum temperature of 3°C (37°F) and an average of 19°C (67°F), soaring to a maximum of 35°C (95°F). This month sees increased precipitation at 121 mm (4.8 in) over 12 days, but with slightly lower humidity at 78%. For a closer look at specific weather patterns, check out National Harbor weather in May.

March and June exhibit significant differences in weather patterns. In March, temperatures range from a chilly minimum of -6°C (22°F) to a mild maximum of 29°C (84°F), with an average of 8°C (47°F). The month experiences 82 mm (3.2 in) of precipitation over about 9 days, alongside relatively high humidity at 83%. Conversely, June warms up considerably, boasting a minimum temperature of 9°C (49°F) and a much higher average of 24°C (76°F), peaking at 37°C (98°F). Although June sees increased precipitation at 107 mm (4.2 in) spread over 13 days, humidity slightly decreases to 79%. For a closer look at June's weather specifics, check out this link: National Harbor weather in June.

In March, temperatures can be quite chilly, with minimums dropping as low as -6°C (22°F) and averaging around 8°C (47°F). The weather is variable, with maximum temperatures reaching up to 29°C (84°F), and the month sees about 82 mm (3.2 in) of precipitation over approximately 9 days, contributing to a high humidity level of 83%.

In contrast, July brings warmer and more consistently high temperatures, with a minimum of 16°C (61°F), an average of 27°C (81°F), and maximums soaring up to 38°C (102°F). The month is wetter, recording around 132 mm (5.2 in) of precipitation across 12 days, although humidity is slightly lower at 74%. For a closer look at July's climate specifics, check out National Harbor weather in July.

When comparing the weather in March and August, significant differences emerge. March typically experiences cooler temperatures, with minimums reaching as low as -6°C (22°F) and average highs around 8°C (47°F), occasionally peaking at 29°C (84°F). The month is characterized by higher humidity levels at 83% and about 82 mm (3.2 in) of precipitation over 9 days. In contrast, August boasts a much warmer climate, with minimum temperatures of 15°C (59°F) and average highs around 25°C (78°F), soaring to a maximum of 37°C (99°F). Rainfall increases to 146 mm (5.7 in) spread over 15 days, albeit with lower humidity at 72%. For more detailed insights, you can check out the link: National Harbor weather in August.

In March, temperatures vary widely, with minimums dipping down to -6°C (22°F) and average highs around 8°C (47°F), reaching up to 29°C (84°F) on warmer days. The month also experiences considerable precipitation, totaling 82 mm (3.2 in) over approximately 9 days, accompanied by a high humidity level of 83%. In contrast, September offers more consistent warmth, with minimum temperatures starting at 6°C (44°F) and average highs peaking at 22°C (73°F), reaching a maximum of 37°C (99°F). Precipitation slightly increases to 93 mm (3.7 in) over about 11 days, but with lower humidity at 75%. For more details on the specific weather for this month, check National Harbor weather in September.

March and October exhibit distinct weather characteristics that reflect their transitional nature within the seasons. In March, temperatures can dip as low as -6°C (22°F), with an average of 8°C (47°F) and highs reaching up to 29°C (84°F). The month experiences about 82 mm (3.2 in) of precipitation over nine days, accompanied by a relatively high humidity level of 83%. In contrast, October presents milder conditions, featuring minimum temperatures of 2°C (36°F) and an average of 17°C (63°F), while maximum temperatures can soar to 36°C (97°F). This month sees increased precipitation at 105 mm (4.2 in), also spread over nine days, with a slightly lower humidity of 81%. For a closer look at October weather specifics, visit National Harbor weather in October.

Comparing the weather in March and November reveals some interesting similarities and differences. In March, temperatures range from a chilly minimum of -6°C (22°F) to a warm average of 8°C (47°F), peaking at a maximum of 29°C (84°F). This month sees approximately 82 mm (3.2 in) of precipitation over about 9 days, accompanied by a humidity level of 83%. In contrast, November has slightly milder temperatures, with a minimum of -5°C (23°F) and an average of 9°C (48°F), reaching a maximum of 26°C (78°F). Precipitation in November is slightly less, at 77 mm (3.0 in) over 7 days, with a humidity level of 85%. For those interested in specifics, more details on National Harbor weather in November can be found.

March and December present contrasting weather patterns, marking the transition between winter and spring months. In March, temperatures range from a minimum of -6°C (22°F) to a maximum of 29°C (84°F), with an average temperature of 8°C (47°F). The month experiences moderate precipitation of 82 mm (3.2 in) over approximately 9 days and maintains a humidity level of 83%. Conversely, December features colder temperatures with a minimum of -10°C (14°F), an average of 5°C (42°F), and a maximum of 20°C (69°F). This month sees slightly higher precipitation at 89 mm (3.5 in) over the same number of days, accompanied by a humidity level of 84%. For more detailed insights about December weather, check out National Harbor weather in December.

Compare National Harbor's Climate with Cities Worldwide

Conclusion: What to Expect From March Weather in National Harbor

March marks a transitional stretch for National Harbor as it gradually shifts from the cold grip of winter towards the warmer touches of spring. While temperatures can soar to a pleasant 29°C (84°F), early March still feels the bite with chilly lows dipping to -6°C (22°F). This month is characterized by higher humidity levels at 83%, contributing to a feeling of dampness, particularly during its nine days of measurable precipitation. Compared to the more stable weather of other months, March reminds us of nature’s unpredictability, providing a blend of warm sunny days and occasional cool, wet spells. For a deeper look into how March fits into the overall weather patterns, explore the complete details at National Harbor Climate.