March Weather in Saint John, United States

Last updated: June 24, 2025

In March, the average temperature in Saint John, United States hovers around 6°C (42°F), with extremes reaching as low as -14°C (7°F) and soaring to a maximum of 20°C (67°F). Expect 56 mm (2.2 in) of precipitation spread over 11 days, contributing to an average humidity level of 86%. Prepare for a typical chilly and damp experience!

March Temperature in Saint John

In March, in Saint John, the average temperature is 6°C (42°F), with maximums reaching up to 20°C (67°F) and minimums dropping as low as -14°C (7°F). Be prepared for a wide range of temperatures if you plan to travel 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 6°C (42°F), with highs reaching up to 20°C (67°F) and lows dropping to around -14°C (7°F).

Data source: Temperature data for Saint John generated using information from the Copernicus Climate Change Service.

March Precipitation in Saint John

In Saint John in March, the precipitation amount is 56 mm (2.2 in) over the course of 11 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 56 mm (2.2 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in Saint John

In Saint John in March, humidity is 86%. With an average temperature of 6°C (42°F), this humidity feels like a chilly, damp embrace that can make outdoor activities feel uncomfortable and chilly, prompting travelers to seek shelter or warm clothing to stay cozy while exploring.

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 86%, offering insight into how humid the weather typically is during this month.

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 reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, 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 5, which falls under the moderate exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (35°F)	62 mm (2.5 inches)	85%	low
February Weather	1°C (34°F)	74 mm (2.9 inches)	86%	moderate
March Weather	6°C (42°F)	56 mm (2.2 inches)	86%	moderate
April Weather	10°C (50°F)	48 mm (1.9 inches)	82%	high
May Weather	15°C (59°F)	45 mm (1.8 inches)	77%	very high
June Weather	20°C (68°F)	20 mm (0.8 inches)	79%	very high
July Weather	24°C (76°F)	2 mm (0.1 inches)	77%	very high
August Weather	24°C (75°F)	10 mm (0.4 inches)	62%	very high
September Weather	18°C (64°F)	22 mm (0.9 inches)	60%	high
October Weather	10°C (50°F)	54 mm (2.1 inches)	80%	moderate
November Weather	5°C (41°F)	74 mm (2.9 inches)	87%	moderate
December Weather	1°C (34°F)	70 mm (2.8 inches)	86%	low