April Weather in Harrow on the Hill, United Kingdom

Last updated: March 17, 2025

In April, Harrow on the Hill experiences a fluctuating climate, with temperatures ranging from a brisk -2°C (29°F) during the chilly nights to a pleasant 26°C (80°F) on warmer days. The average temperature settles around a cool 10°C (49°F), making it a month of transitions. Despite the arrival of spring, residents and visitors should be prepared for some rain, as precipitation totals 33 mm (1.3 in) over approximately 8 days. Humidity levels hover around 85%, adding a touch of dampness to the air. Whether you're enjoying the blossoming nature or layering up for the cool evenings, April in Harrow offers a unique blend of springtime charm.

April Temperature in Harrow on the Hill

April in Harrow on the Hill heralds a delightful transition towards warmer days, with temperatures reflecting a notable rise from the chill of winter. The month begins with minimums around -2°C (29°F), hinting at the last vestiges of cold air, but quickly warms to an average of 10°C (49°F), providing a comforting boost to outdoor activities. As the month progresses, maximum temperatures soar to an impressive 26°C (80°F), showcasing a leap from the tepid March climate. This pattern of rising warmth sets the stage for May's promise of even higher temperatures, while April itself becomes a vibrant prelude to spring, bursting into life with blooming florals and longer days.

April Weather in Harrow on the Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Harrow on the Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345495562656459534643
Data source: Temperature data for Harrow on the Hill 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 Harrow on the Hill

In April, Harrow on the Hill experiences a notable decrease in rainfall, with only 33 mm (1.3 inches) of precipitation over about 8 days. This marks a significant drop compared to the preceding months, where January, February, and March consistently saw around 54 mm (2.1 inches) each. As spring unfolds, the lighter rainfall paves the way for more sunnier days, which is reminiscent of the upcoming months ahead, especially as May anticipates a marked increase in precipitation to 62 mm (2.5 inches). This trend highlights April as a transitional period, as the weather starts to shift from the wetter embrace of early spring to the gradually warming and occasionally soggy days of late spring and summer.

April Precipitation Trends in Harrow on the Hill

The chart displays monthly precipitation patterns in Harrow on the Hill, 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.
JanFebMarAprMayJunJulAugSepOctNovDec545354336277647045845284
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Harrow on the Hill

In April, Harrow on the Hill experiences a slight dip in humidity, averaging 85%—a subtle decline from the higher levels seen in the early months of the year. This reduction follows a trend of gradually decreasing humidity, which starts at a robust 91% in January and tapers off to 79% by May. As spring progresses, residents begin to enjoy slightly drier air, paving the way for more pleasant outdoor experiences. However, the humidity remains high compared to the summer months, which typically see averages around 71% to 80%. The overall trend suggests a transition toward more comfortable conditions, yet the lingering moisture in April serves as a reminder of the region's characteristic dampness before fully embracing the warmer, sunnier days ahead.

April Average Humidity in Harrow on the Hill

This chart illustrates the average monthly humidity levels in Harrow on the Hill, 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Harrow on the Hill

As April unfolds in Harrow on the Hill, the UV Index reaches a moderate level of 5, indicating an increased need for sun protection. This shift from March's 4 marks a noticeable trend towards brighter, sunnier days as spring takes hold, with a reduced burn time of 30 minutes. As the weather warms, residents should be mindful of sun exposure, particularly with May on the horizon, which is set to jump to a high 7. This upward trajectory in UV levels demonstrates the importance of staying informed as the seasons change. For further insights, visit Harrow on the Hill UV Index.

Maximum UV Index Levels in Harrow on the Hill for April

The chart shows the monthly maximum UV Index (UVI) for Harrow on the Hill 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Harrow on the Hill 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 Harrow on the Hill

As spring unfolds in Harrow on the Hill, April shines brightest with a remarkable 319 hours of sunshine, marking a significant leap from the 210 hours enjoyed in March. This surge reflects the gradual awakening of nature and the warmth of the season, heralding the approach of summer. April's radiant sunshine is a precursor to May, which typically dazzles with 398 hours, making it a perfect time for outdoor activities and exploration. Interestingly, this trend of increasing daylight hours showcases a steady climb from the depths of winter, where January's 98 hours feels like a distant memory. With each month progressively bringing more sunshine, Harrow on the Hill embraces longer days filled with light, inviting residents and visitors alike to bask in the warmth of April's cheerful glow.

Monthly Sunshine Duration in Harrow on the Hill: April Highlighted

The April sunshine duration represents the total number of hours Harrow on the Hill 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.
JanFebMarAprMayJunJulAugSepOctNovDec98h148h210h319h398h389h404h368h300h241h144h109h
Data source: Harrow on the Hill April Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Harrow on the Hill During April

In Harrow on the Hill, the likelihood of sunny weather takes a noticeable leap in April, boasting a 49% chance of sunshine. This marked increase from the preceding months reflects the onset of spring, as the sun begins to reclaim the skies after the dreary winter months. January and February struggle with meager chances of sun at 19% and 25% respectively, while March nudges up to 29%. April’s vibrant 49% sits as a delightful contrast, making it the most promising month for sunshine prior to the summer. As the year progresses into May and beyond, the chances begin to wane again, suggesting that April might just be the sunniest highlight before the fluctuating conditions of late spring and summer return.

Percentage of Sunny Days in April in Harrow on the Hill

The chart illustrates the percentage of sunny days in Harrow on the Hill 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 Harrow on the Hill experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%25%29%49%33%28%38%25%29%25%32%17%
Data source: Harrow on the Hill April chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Harrow on the Hill in April

As spring unfolds in Harrow on the Hill, April brings a notable increase in daylight, offering an average of 13 hours of sun each day. This marks a significant transition from the 11 hours experienced in March, highlighting the gradual return of longer days as nature awakens. Following April, daylight continues to extend, reaching a peak of 15 hours in May and maintaining 16 hours through June and July, before gently tapering off in the summer months. This progressive increase not only enhances outdoor activities but also lifts spirits, establishing a rhythm of rejuvenation that characterizes the season.

Average Daylight Hours in Harrow on the Hill for April

The chart illustrates the variation in daylight duration in Harrow on the Hill throughout the year, with April highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 23m9h 58m11h 55m13h 54m15h 38m16h 32m16h 3m14h 30m12h 35m10h 36m8h 50m7h 53m
Data source: Harrow on the Hill daylight hours, calculated by summing the hours between sunrise and sunset for each day.

April Winds in Harrow on the Hill

As April arrives in Harrow on the Hill, the gentle whisper of the wind signifies a noticeable shift in the season. With an average wind speed of 3.5 m/s (8 mph), April experiences a decline in gustiness compared to the preceding months, presenting a more tranquil atmosphere that invites outdoor strolls. This decrease continues the trend from the brisk start of the year, where January's winds were among the strongest at 4.2 m/s (9 mph). As spring blossoms, the environment shifts from the hearty chill of winter and the crispness of early spring to a serene breeze, hinting at the warmer days ahead. This overall moderation in wind speed not only enhances the daily experience but also sets the tone for the mellower, sun-kissed months of May and June.

Average April Wind Speed in Harrow on the Hill

The chart displays monthly wind speed patterns in Harrow on the Hill, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.74.43.5 m/s4.23.13.33.83.34.43.84.4
Data source: Harrow on the Hill April wind data, generated using information from the Copernicus Climate Change Service.

How April Weather in Harrow on the Hill Compares to Other Months

The weather in Harrow on the Hill 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 Harrow on the Hill and find detailed weather information for every month.

In comparing the weather between April and January, we can observe notable differences in temperature and precipitation patterns. April generally features milder temperatures with a minimum of -2°C (29°F) and an average of 10°C (49°F), peaking at 26°C (80°F). In contrast, January experiences colder conditions, with temperatures ranging from a minimum of -5°C (24°F) to a maximum of 14°C (58°F), resulting in an overall average of just 5°C (41°F).

Precipitation is also more pronounced in January, with 54 mm (2.1 in) recorded over 10 days compared to April’s 33 mm (1.3 in) over 8 days. Additionally, humidity levels are slightly higher in January at 91%, compared to April's 85%. For more detailed information, you can check Harrow on the Hill weather in January.

April tends to be warmer than February, with average temperatures rising from 6°C (43°F) in February to 10°C (49°F) in April, and maximum temperatures peaking at 26°C (80°F) in April compared to 18°C (65°F) in February. While February experiences colder nights with a minimum temperature of -5°C (23°F), April sees milder lows of -2°C (29°F). Precipitation is generally higher in February, with 53 mm (2.1 in) falling over 11 days, compared to April's 33 mm (1.3 in) across 8 days. Additionally, humidity levels remain slightly elevated in February at 89%, compared to 85% in April. For further details, you can check Harrow on the Hill weather in February.

April generally shows a notable improvement in weather compared to March. With minimum temperatures rising from -5°C (23°F) in March to -2°C (29°F) in April, and an average temperature increase from 7°C (46°F) to 10°C (49°F), it's clear that spring is making its presence felt. Additionally, April boasts a higher maximum temperature of 26°C (80°F) compared to March’s 22°C (71°F), offering warmer days. However, April experiences less precipitation, with 33 mm (1.3 in) falling over 8 days versus March’s 54 mm (2.1 in) over 13 days. The humidity remains fairly consistent, at 85% in April compared to 86% in March. For a closer look at how March weather impacts the region, you can check Harrow on the Hill weather in March.

April and May present notable differences in weather patterns. In April, temperatures range from a chilly minimum of -2°C (29°F) to a comfortable maximum of 26°C (80°F), with an average of 10°C (49°F). The month sees relatively low precipitation at 33 mm (1.3 in) over 8 days, while humidity remains high at 85%. In contrast, May features a slightly warmer temperature range, with minimums of 1°C (35°F) and a maximum of 25°C (78°F), leading to an average of 13°C (55°F). However, the month is wetter, totaling 62 mm (2.5 in) of rainfall over 11 days, and the humidity decreases to 79%. For more detailed insights, visit Harrow on the Hill weather in May.

April and June offer quite different weather experiences. In April, temperatures can dip as low as -2°C (29°F), with an average of 10°C (49°F) and occasional highs reaching 26°C (80°F). The month sees a moderate amount of precipitation at 33 mm (1.3 in) over about 8 days, coupled with high humidity levels of 85%. In contrast, June presents a much warmer climate, with minimum temperatures starting at 7°C (45°F) and average highs soaring to 31°C (89°F). The total precipitation increases to 77 mm (3.0 in) over 9 days, while humidity slightly decreases to 80%. For more specific information, you can check out Harrow on the Hill weather in June.

April and July present notably different weather patterns. In April, temperatures range from a chilly minimum of -2°C (29°F) to a comfortable average of 10°C (49°F), with maximums reaching up to 26°C (80°F). The month typically sees about 33 mm (1.3 in) of rainfall over 8 days, accompanied by high humidity levels at 85%. In contrast, July boasts warmer conditions, with minimum temperatures starting at 9°C (49°F), an average of 18°C (65°F), and peaks soaring to 36°C (96°F). Rainfall increases to 64 mm (2.5 in) over 11 days, but humidity drops to a more pleasant 71%. For a deeper look into July’s climate specifics, check out Harrow on the Hill weather in July.

April and August present notably different weather patterns. In April, temperatures range from a chilly minimum of -2°C (29°F) to a pleasant maximum of 26°C (80°F), with an average of 10°C (49°F). The month sees moderate precipitation, totaling 33 mm (1.3 in) over about 8 days, accompanied by high humidity at 85%. In contrast, August features milder weather with minimum temperatures starting at 8°C (47°F) and peaking at a sweltering 34°C (93°F), averaging around 18°C (64°F). This month experiences greater precipitation, reaching 70 mm (2.7 in) across 12 days, but with lower humidity at 76%. For more details, you can check Harrow on the Hill weather in August.

April and September present contrasting yet mild weather profiles. In April, temperatures range from a chilly minimum of -2°C (29°F) to a pleasant average of 10°C (49°F), peaking at 26°C (80°F). The month experiences about 33 mm (1.3 in) of precipitation over approximately 8 days, coupled with relatively high humidity at 85%. In comparison, September shows a slight uptick in temperatures, with a minimum of 4°C (39°F) and an average of 15°C (59°F), reaching a maximum of 28°C (83°F). Precipitation increases to 45 mm (1.8 in) over 10 days, and humidity remains slightly lower at 82%. For more detailed insights on September weather, you can check Harrow on the Hill weather in September.

April and October present contrasting weather patterns, with April experiencing a wider temperature range from a chilly minimum of -2°C (29°F) to a warm maximum of 26°C (80°F) and averaging around 10°C (49°F). In this month, precipitation totals 33 mm (1.3 in) over about 8 days, accompanied by a relatively high humidity level of 85%. Conversely, October features milder temperatures, with a minimum of 1°C (34°F), a maximum of 22°C (73°F), and an average of 12°C (54°F). It is also wetter, receiving 84 mm (3.3 in) of rainfall across 12 days, along with increased humidity at 90%. For a closer look at the weather specifics, visit Harrow on the Hill weather in October.

April and November present quite different weather patterns, despite sharing similar minimum temperatures of -2°C (29°F). April features a warmer average temperature of 10°C (49°F) and can reach highs of 26°C (80°F), making it a more variable and often delightful month for outdoor activities. In contrast, November is cooler, with an average temperature of 8°C (47°F) and a maximum of only 16°C (62°F), resulting in a more subdued atmosphere. Additionally, November experiences more precipitation, averaging 52 mm (2.0 in) over 11 days, compared to April’s 33 mm (1.3 in) over 8 days, along with a higher humidity of 92%. For more detailed weather information, check out Harrow on the Hill weather in November.

April and December in Harrow on the Hill present quite different weather conditions. In April, temperatures range from a chilly -2°C (29°F) to a warm 26°C (80°F), with an average of 10°C (49°F). This month experiences about 33 mm (1.3 in) of precipitation over approximately 8 days, and humidity sits at around 85%. In contrast, December is much colder, with temperatures ranging from -4°C (24°F) to a maximum of 14°C (58°F) and an average of 6°C (44°F). The rainfall is significantly higher, totaling 84 mm (3.3 in) over about 13 days, and humidity increases to 92%. For more detailed insights, check out Harrow on the Hill weather in December.

Compare Harrow on the Hill's Climate with Cities Worldwide

Conclusion: What to Expect From April Weather in Harrow on the Hill

As April unfolds in Harrow on the Hill, the weather does an intriguing dance between winter's chill and spring's warmth. With temperatures swinging from a brisk -2°C to a pleasant 26°C, this month stands out for its evolving climate, preparing the landscape for vibrant blooms. A modest 33 mm of rain graces the region across about eight days, accompanied by a rather high humidity level of 85%, adding a touch of moisture to the air. April's unpredictable nature, bridging the gap between the lingering cold of winter and the burgeoning warmth of summer, makes it a unique time for residents and visitors alike. For a deeper understanding of the seasonal shifts, explore Harrow on the Hill Climate.