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March Weather in Harrow, United Kingdom

Last updated: August 27, 2025

In Harrow, United Kingdom, the average temperature in March hovers around 7°C (46°F). Be prepared for a range of conditions, as temperatures can dip as low as -5°C (23°F) or rise to a pleasant 22°C (71°F). During this month, you can expect approximately 54 mm (2.1 in) of precipitation spread over 13 days, resulting in an average humidity of 86%.

March Temperature in Harrow

In March in Harrow, the average temperature is 7°C (46°F). Maximum temperatures can reach 22°C (71°F), while minimum temperatures can drop as low as -5°C (23°F). Pack layers to stay comfortable and enjoy a variety of outdoor activities during your visit.

March Weather in Harrow: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Harrow, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harrow, March typically has an average temperature of 7°C (46°F), with highs reaching up to 22°C (71°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec414345495562656459534643
Data source: Temperature data for Harrow 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 Harrow

In Harrow in March, the precipitation amount is 54 mm (2.1 in), falling over the course of 13 days.

March Precipitation Trends in Harrow

The chart displays monthly precipitation patterns in Harrow, 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. In Harrow, March typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec545354336277647045845284
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Harrow

In Harrow in March humidity is 86%. With an average temperature of 7°C (46°F), this humidity feels like wrapping yourself in a damp blanket, making travel uncomfortable and heavy, as the cold air mixes with the muggy atmosphere, leaving you longing for a warm, dry refuge.

March Average Humidity in Harrow

This chart illustrates the average monthly humidity levels in Harrow, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Harrow is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Harrow

In Harrow in March, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Harrow for better planning.

Maximum UV Index Levels in Harrow for March

The chart shows the monthly maximum UV Index (UVI) for Harrow 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. In March, the maximum UV index in Harrow typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Harrow 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.

How March Weather in Harrow Compares to Other Months

Weather in Harrow varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in Harrow, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Harrow, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)54 mm (2.1 inches)91%low
February Weather6°C (43°F)53 mm (2.1 inches)89%low
March Weather7°C (46°F)54 mm (2.1 inches)86%moderate
April Weather10°C (49°F)33 mm (1.3 inches)85%moderate
May Weather13°C (55°F)62 mm (2.5 inches)79%high
June Weather16°C (62°F)77 mm (3.0 inches)80%very high
July Weather18°C (65°F)64 mm (2.5 inches)71%very high
August Weather18°C (64°F)70 mm (2.7 inches)76%high
September Weather15°C (59°F)45 mm (1.8 inches)82%high
October Weather12°C (54°F)84 mm (3.3 inches)90%moderate
November Weather8°C (47°F)52 mm (2.0 inches)92%low
December Weather6°C (44°F)84 mm (3.3 inches)92%low

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