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March Weather in Saint John, United States

Last updated: June 24, 2025

In March, the average temperature in Saint John, United States hovers around 8°C (47°F). During this time, temperatures can range from a chilly -17°C (1°F) to a warm 32°C (89°F). Expect a precipitation of about 68 mm (2.7 in) over the course of 7 days, with an average humidity of 67%.

March Temperature in Saint John

In March, in Saint John, the average temperature is 8°C (47°F). Maximum temperatures can reach 32°C (89°F), while minimums can drop as low as -17°C (1°F). Be prepared for a wide range of temperatures when traveling during this time.

March Weather in Saint John: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Saint John, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint John, March typically has an average temperature of 8°C (47°F), with highs reaching up to 32°C (89°F) and lows dropping to around -17°C (1°F).
JanFebMarAprMayJunJulAugSepOctNovDec323346546577817873564537
Data source: Temperature data for Saint John 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 Saint John

In Saint John in March, the precipitation amount is 68 mm (2.7 in) over the course of 7 days.

March Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, 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 Saint John, March typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec2621685016862587462812432
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Saint John

In Saint John in March humidity is 67%. With an average temperature of 8°C (47°F), this humidity feels like a chilly embrace, making traveling slightly uncomfortable as the damp air clings to your skin, often leaving you feeling colder than the actual temperature suggests.

March Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, 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 Saint John is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Saint John

In Saint John in March, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Saint John.

Maximum UV Index Levels in Saint John for March

The chart shows the monthly maximum UV Index (UVI) for Saint John 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 Saint John typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4579101111109753
Data source: Saint John 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 Saint John Compares to Other Months

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

This table compares monthly weather conditions in Saint John, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)25 mm (1.0 inches)75%moderate
February Weather1°C (34°F)21 mm (0.8 inches)76%moderate
March Weather8°C (47°F)68 mm (2.7 inches)67%high
April Weather12°C (54°F)50 mm (2.0 inches)70%very high
May Weather18°C (65°F)168 mm (6.6 inches)82%very high
June Weather25°C (77°F)62 mm (2.4 inches)82%extreme
July Weather27°C (81°F)58 mm (2.3 inches)81%extreme
August Weather25°C (78°F)74 mm (2.9 inches)76%very high
September Weather23°C (73°F)62 mm (2.4 inches)67%very high
October Weather14°C (57°F)81 mm (3.2 inches)72%high
November Weather7°C (45°F)24 mm (0.9 inches)80%moderate
December Weather3°C (37°F)32 mm (1.3 inches)83%moderate

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