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March Weather in New Haven, United States

Last updated: June 24, 2025

In New Haven, United States, the average temperature in March hovers around 4°C (39°F), with temperatures ranging from a chilly -9°C (15°F) to a mild 19°C (66°F). Visitors can expect precipitation of approximately 109 mm (4.3 in) over about 10 days, accompanied by a high average humidity of 81%. Prepare for a somewhat damp but refreshing experience!

March Temperature in New Haven

In March in New Haven, the average temperature is 4°C (39°F). The maximum can reach 19°C (66°F), while the minimum can dip as low as -9°C (15°F). Be prepared for a range of weather conditions when traveling during this time.

March Weather in New Haven: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in New Haven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Haven, March typically has an average temperature of 4°C (39°F), with highs reaching up to 19°C (66°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec333539475766747468604738
Data source: Temperature data for New Haven 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 New Haven

In New Haven in March, the precipitation amount is 109 mm (4.3 in) spread over 10 days.

March Precipitation Trends in New Haven

The chart displays monthly precipitation patterns in New Haven, 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 New Haven, March typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec901321091531309313297108171112160
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in New Haven

In New Haven in March, humidity is 81%. With an average temperature of 4°C (39°F), this humidity feels like a chilling dampness that penetrates even the warmest layers of clothing, making outdoor exploration uncomfortable and prompting travelers to seek refuge indoors.

March Average Humidity in New Haven

This chart illustrates the average monthly humidity levels in New Haven, 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 New Haven is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in New Haven

In New Haven in March, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in New Haven, you can refer to this Hourly UV Index in New Haven.

Maximum UV Index Levels in New Haven for March

The chart shows the monthly maximum UV Index (UVI) for New Haven 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 New Haven typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: New Haven 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 New Haven Compares to Other Months

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

This table compares monthly weather conditions in New Haven, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)90 mm (3.5 inches)84%moderate
February Weather1°C (35°F)132 mm (5.2 inches)82%moderate
March Weather4°C (39°F)109 mm (4.3 inches)81%high
April Weather8°C (47°F)153 mm (6.0 inches)78%very high
May Weather14°C (57°F)130 mm (5.1 inches)69%very high
June Weather19°C (67°F)93 mm (3.7 inches)69%very high
July Weather23°C (74°F)132 mm (5.2 inches)62%very high
August Weather23°C (74°F)96 mm (3.8 inches)65%very high
September Weather20°C (69°F)108 mm (4.3 inches)68%very high
October Weather15°C (60°F)171 mm (6.7 inches)74%high
November Weather8°C (47°F)112 mm (4.4 inches)82%moderate
December Weather4°C (39°F)160 mm (6.3 inches)80%low

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