April Weather in National Harbor, United States

Last updated: February 24, 2025

In April, National Harbor, United States, experiences a remarkable temperature variation, with maximum highs reaching 33°C (92°F) and minimum lows dipping to -1°C (31°F). The average temperature hovers around a comfortable 14°C (58°F), making it a versatile month for outdoor activities. However, visitors should be prepared for frequent rain, as the area receives about 102 mm (4.0 in) of precipitation over 11 days, accompanied by an humidity level of 81%. This mix of warm days and wet spells creates a unique early spring atmosphere, perfect for exploring the vibrant surroundings of National Harbor.

April Temperature in National Harbor

As April blossoms in National Harbor, the temperatures begin to show a delightful transformation, signaling the arrival of spring. The month starts with a minimum temperature of -1°C (31°F) and climbs to a refreshing average of 14°C (58°F), peaking at a sunny maximum of 33°C (92°F). This notable shift from the chill of March not only highlights the growing warmth but also sets the stage for May's even milder temperatures. With each passing day, residents and visitors alike enjoy the outdoor splendor, embracing longer, sunnier days underscored by the gradual climb from the earlier frosty nights. In this vibrant month, the energy of the locale truly begins to mirror the warmth of the season, inviting everyone to revel in the beauty of nature awakening.

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

The chart illustrates April 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.

April Precipitation in National Harbor

April marks a notable transition in National Harbor's weather, with precipitation levels peaking at 102 mm (4.0 in), making it the fourth wettest month of the year. Consistent with the trend observed since January, April experiences 11 rainy days, matching February and aligning with an upward trajectory as spring fully unfolds. This increase sets the stage for even wetter months ahead, particularly as May and June approach, where precipitation averages rise significantly to 121 mm (4.8 in) and 107 mm (4.2 in), respectively. The steady growth in rainfall is complemented by a shift in temperature and rejuvenation of local flora, signaling a vibrant and refreshing spring season ahead.

April Precipitation Trends in National Harbor

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

In April, humidity in National Harbor, United States, begins to show a subtle shift as it decreases to 81%, following a trend of slightly lower moisture levels from the winter months. This marks a continued decline from the higher humidity levels of January and February, both hovering around 84%. As the region transitions into spring, the moisture content starts its gradual descent, paving the way for drier conditions in the coming months, particularly noticeable in May when humidity drops further to 78%. This pattern signifies a movement towards more comfortable weather, setting the stage for the upcoming summer months where humidity is expected to reach even lower levels, enhancing the outdoor experience in this vibrant locale.

April Average Humidity in National Harbor

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

April UV Index in National Harbor

As April unfolds in National Harbor, the UV Index surges to a notable 9, placing it in the very high exposure category. This marks a significant increase from previous months, signaling that sun safety becomes paramount; the burn time drops sharply to just 15 minutes. This upward trend reflects the approach of summer when UV levels are at their peak, emphasizing the need for protective measures. With May following closely with an even higher UV Index of 10, residents and visitors alike should be prepared for intense sun exposure. As the warm weather invites outdoor activities, it's crucial to stay informed about UV levels and prioritize skin protection. For more details, visit the National Harbor UV Index.

Maximum UV Index Levels in National Harbor for April

The chart shows the monthly maximum UV Index (UVI) for National Harbor in April, 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 April 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.

April Sunshine in National Harbor

April in National Harbor ushers in a breathtaking 259 hours of sunshine, matching the enthusiastic spirit of spring. This month mirrors the vibrant rays of March, signaling a trend of increasing daylight that peaks as the region transitions into the warmer months. As the days lengthen, May brings an even sunnier disposition with 286 hours, and the momentum continues, reaching its zenith in July with an impressive 357 hours. The steady climb from the chilly, sun-starved January days—just 153 hours—illustrates a warm invitation to embrace outdoor activities as the year progresses. As summer approaches, the consistent increase in sunlight not only enhances the beauty of National Harbor but also offers a perfect backdrop for leisurely strolls and gatherings along its scenic waterfront.

Monthly Sunshine Duration in National Harbor: April Highlighted

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

Chance of Sun in National Harbor During April

In April, the National Harbor experiences a promising 49% chance of sunny weather, marking a significant transition from the colder months. While March boasts a slightly higher 52%, April's likelihood remains robust, suggesting a delightful spring ambiance. As the month unfolds, the sunny days become less frequent in the following months, with May and June dropping to 40% and 39% respectively. However, this dip doesn't overshadow the fact that April, nestled between winter's chill and summer's heat, offers a refreshing balance of sunshine, making it an appealing time for outdoor activities and leisurely strolls along the harbor.

Percentage of Sunny Days in April in National Harbor

The chart illustrates the percentage of sunny days in National Harbor throughout the year, with April 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 April chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in National Harbor in April

As spring unfolds in National Harbor, April brings a noticeable increase in daylight, extending to 13 hours compared to 11 hours in March. This shift not only enhances the outdoor experience but also sets the stage for the longer, sun-filled days of May and June, which each boast a peak of 14 hours of daylight. The trend is unmistakable: as the year progresses from winter into spring, daylight hours gradually lengthen, inviting residents and visitors alike to embrace the warmth and vibrancy of the season. However, as summer gives way to fall, daylight will begin to taper, reminding us of the cyclical nature of time as each month transitions.

Average Daylight Hours in National Harbor for April

The chart illustrates the variation in daylight duration in National Harbor throughout the year, with April 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.

April Winds in National Harbor

In April, the winds of National Harbor gently whisper at an average speed of 3.2 m/s (7 mph), consistent with the preceding months of February and March. This steady breeze sets a tranquil yet invigorating scene as spring unfolds, encouraging outdoor activities and waterfront strolls. However, as the season progresses into May, we observe a subtle decline in wind speed to 2.8 m/s (6 mph), hinting at the transition into warmer months. Throughout summer, the winds continue to calm, reaching their lowest speeds in August at just 1.9 m/s (4 mph). As the year rounds out towards October and November, a slight uptick brings the winds back to a more moderate pace, inviting reflections on the natural rhythms of seasonal change.

Average April Wind Speed in National Harbor

The chart displays monthly wind speed patterns in National Harbor, with values for each month shown alongside April's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how April's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.23.23.2 m/s2.82.52.31.92.52.72.92.8
Data source: National Harbor April wind data, generated using information from the Copernicus Climate Change Service.

How April 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 April'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.

April and January present stark contrasts in weather conditions. April features a much wider temperature range, with minimums around -1°C (31°F) and maximums soaring up to 33°C (92°F), averaging a comfortable 14°C (58°F). In this month, precipitation totals 102 mm (4.0 in) over approximately 11 days, accompanied by a humidity level of 81%. In contrast, January is characterized by colder temperatures, with a minimum of -14°C (7°F) and a maximum of 22°C (71°F), resulting in an average temperature of just 3°C (38°F). It sees less rainfall, accumulating 61 mm (2.4 in) over about 7 days, along with slightly higher humidity at 84%. For a closer look at January weather specifics, you can explore National Harbor weather in January.

Comparing the weather in April and February reveals notable contrasts. April experiences significantly milder temperatures, with a minimum of -1°C (31°F) and a warm average of 14°C (58°F), reaching a maximum of 33°C (92°F). In contrast, February is much colder, with minimum temperatures dropping to -14°C (7°F) and an average of only 5°C (42°F), peaking at 27°C (81°F). Precipitation levels are similar, with April receiving 102 mm (4.0 in) compared to February's 96 mm (3.8 in), but both months see precipitation over 11 days. Humidity remains relatively high, with April at 81% and February at 83%. For more detailed insights on February weather, visit National Harbor weather in February.

In comparing the weather between March and April, we see a significant increase in temperatures and precipitation levels. April showcases a more varied temperature range, with a minimum of -1°C (31°F) and a maximum reaching up to 33°C (92°F), leading to a much warmer average of 14°C (58°F). In contrast, March has cooler temperatures, with a minimum of -6°C (22°F) and a maximum of 29°C (84°F), averaging only 8°C (47°F). Additionally, April experiences a higher total precipitation of 102 mm (4.0 in) over 11 days, compared to March's 82 mm (3.2 in) over 9 days. Both months have similar humidity levels, with April at 81% and March slightly higher at 83%. For a more detailed look at March weather, visit National Harbor weather in March.

April and May offer a gradual transition in weather patterns. In April, temperatures range from a chilly minimum of -1°C (31°F) to a warm maximum of 33°C (92°F), with an average of 14°C (58°F). The month sees significant precipitation, totaling 102 mm (4.0 in) over 11 days and maintaining a high humidity level of 81%. Conversely, May experiences milder temperatures, with a minimum of 3°C (37°F) and an average of 19°C (67°F), peaking at 35°C (95°F). Precipitation increases slightly to 121 mm (4.8 in) over 12 days, while humidity decreases to 78%. For more detailed insights, check out National Harbor weather in May.

April weather typically features a wider temperature range, with minimums dropping to around -1°C (31°F) and maximums reaching up to 33°C (92°F). The month experiences significant rainfall, averaging 102 mm (4.0 in) over about 11 days, alongside relatively high humidity at 81%. In contrast, June brings warmer temperatures, with a minimum of 9°C (49°F) and a maximum of 37°C (98°F), resulting in a higher average of 24°C (76°F). While June has slightly more precipitation at 107 mm (4.2 in) over about 13 days, the humidity decreases slightly to 79%. For more detailed information, you can visit National Harbor weather in June.

April weather is characterized by a broader temperature range, with minimums dropping to -1°C (31°F) and maximums reaching up to 33°C (92°F), resulting in an average of 14°C (58°F). In contrast, July experiences much warmer conditions, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 38°C (102°F), yielding a pleasant average of 27°C (81°F). Precipitation levels in April are slightly lower at 102 mm (4.0 in) over about 11 days, while July sees an increase to 132 mm (5.2 in) over 12 days, albeit with lower humidity at 74%. For more details on what to expect in July, you can check out National Harbor weather in July.

When comparing the weather in April and August, there are notable differences in temperature and precipitation. April experiences a wider temperature range, with minimums dipping as low as -1°C (31°F) and maximums reaching 33°C (92°F), while August has a more consistent warmth, with temperatures ranging from 15°C (59°F) to a high of 37°C (99°F). Precipitation is also higher in August, with 146 mm (5.7 in) over 15 days compared to April's 102 mm (4.0 in) over 11 days, although the humidity is slightly lower in August at 72%, compared to April's 81%. For a closer look at the summer climate, check out National Harbor weather in August.

In comparing the weather of April and September, notable differences emerge. April typically experiences a wider temperature range, with minimums plunging to -1°C (31°F) and maximums soaring to 33°C (92°F), while averaging around 14°C (58°F). The month also sees considerable precipitation, with 102 mm (4.0 in) over 11 days and a higher humidity level of 81%. In contrast, September offers milder conditions, with minimum temperatures of 6°C (44°F) and maximums reaching 37°C (99°F), averaging 22°C (73°F). Precipitation slightly decreases to 93 mm (3.7 in) over the same number of days, coupled with a lower humidity of 75%. For more details on specific conditions, you can check National Harbor weather in September.

April and October showcase distinct weather patterns, with April experiencing a wider range of temperatures, from a chilling minimum of -1°C (31°F) to a hot maximum of 33°C (92°F), averaging around 14°C (58°F). In contrast, October features milder temperatures, starting at a minimum of 2°C (36°F) and reaching a maximum of 36°C (97°F), with an average of 17°C (63°F). Both months have similar levels of precipitation, with April receiving 102 mm (4.0 in) over 11 days and October slightly higher at 105 mm (4.2 in) over 9 days, while humidity remains consistent at 81%. For more specific details about the climate in October, you can refer to National Harbor weather in October.

April and November present contrasting weather patterns, highlighting the transition between spring and autumn. In April, temperatures can vary significantly, with a minimum of -1°C (31°F) and a maximum reaching up to 33°C (92°F), averaging around 14°C (58°F). Along with 102 mm (4.0 in) of precipitation spread over 11 days, the month maintains a relatively high humidity level at 81%. In contrast, November is cooler overall, with minimum temperatures dropping to -5°C (23°F) and maximums around 26°C (78°F), averaging just 9°C (48°F). The month sees less precipitation at 77 mm (3.0 in) over 7 days, and humidity remains slightly higher at 85%. Overall, while April showcases warmer days and greater moisture, November offers a chillier and drier climate. For more specific details on November weather patterns, you can visit National Harbor weather in November.

April and December present contrasting weather patterns. In April, temperatures range from a chilly minimum of -1°C (31°F) to a warm maximum of 33°C (92°F), with an average of 14°C (58°F). The month experiences about 102 mm (4.0 in) of precipitation over 11 days, accompanied by high humidity at 81%. In contrast, December brings colder temperatures, with a minimum of -10°C (14°F) and a maximum of 20°C (69°F), resulting in an average of only 5°C (42°F). Precipitation is slightly lower at 89 mm (3.5 in) over 9 days, and humidity peaks at 84%. For more information about weather specifics in December, check out National Harbor weather in December.

Compare National Harbor's Climate with Cities Worldwide

Conclusion: What to Expect From April Weather in National Harbor

April in National Harbor brings a refreshing shift in weather, characterized by a significant increase in temperatures compared to the cooler months preceding it. With a pleasant average temperature of 14°C (58°F), this month marks the transition into a more vibrant spring, offering sunny days amidst occasional rain, as evidenced by the 11 days of precipitation. The humidity also rises, creating a comfortable yet slightly muggy atmosphere that feels different from the drier winter months. If you're curious about how these changes fit into the broader climate patterns, check out National Harbor Climate for deeper insights!