May Weather in Port Saint John, United States

Last updated: June 24, 2025

In Port Saint John, United States, the average temperature in May is a pleasant 25°C (77°F). Expect a minimum of 16°C (61°F) and a maximum reaching 31°C (88°F). However, don't forget your umbrella, as you might encounter 124 mm (4.9 in) of precipitation spread over 11 days. Additionally, the average humidity hovers around 68%, creating a delightful yet slightly damp atmosphere!

May Temperature in Port Saint John

In May in Port Saint John, the average temperature is 25°C (77°F). Maximum temperatures can reach 31°C (88°F), while minimums can drop to 16°C (61°F). This mild climate makes Port Saint John an ideal destination for travelers seeking comfortable weather.

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

The chart illustrates May temperature patterns in Port 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 Port Saint John, May typically has an average temperature of 25°C (77°F), with highs reaching up to 31°C (88°F) and lows dropping to around 16°C (61°F).

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

May Precipitation in Port Saint John

In Port Saint John in May, the precipitation amount is 124 mm (4.9 in) over the course of 11 days.

May Precipitation Trends in Port Saint John

The chart displays monthly precipitation patterns in Port Saint John, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Port Saint John, May typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Port Saint John

In Port Saint John in May, humidity is 68%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace that can quickly become stifling for traveling, making outdoor activities feel more strenuous and the air thick and heavy.

May Average Humidity in Port Saint John

This chart illustrates the average monthly humidity levels in Port Saint John, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Port Saint John is approximately 68%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Port Saint John

In Port Saint John in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Port Saint John.

Maximum UV Index Levels in Port Saint John for May

The chart shows the monthly maximum UV Index (UVI) for Port Saint John in May, 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 May, the maximum UV index in Port Saint John typically reaches 11, which falls under the extreme exposure category.

Data source: Port Saint John May 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 May Weather in Port Saint John Compares to Other Months

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

This table compares monthly weather conditions in Port Saint John, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	17°C (64°F)	38 mm (1.5 inches)	83%	high
February Weather	19°C (67°F)	51 mm (2.0 inches)	80%	very high
March Weather	20°C (69°F)	25 mm (1.0 inches)	75%	very high
April Weather	23°C (73°F)	72 mm (2.8 inches)	70%	extreme
May Weather	25°C (77°F)	124 mm (4.9 inches)	68%	extreme
June Weather	26°C (80°F)	164 mm (6.4 inches)	75%	extreme
July Weather	27°C (82°F)	172 mm (6.8 inches)	79%	extreme
August Weather	28°C (82°F)	220 mm (8.7 inches)	81%	extreme
September Weather	27°C (81°F)	189 mm (7.4 inches)	83%	extreme
October Weather	26°C (78°F)	107 mm (4.2 inches)	81%	very high
November Weather	22°C (71°F)	62 mm (2.4 inches)	82%	high
December Weather	19°C (66°F)	65 mm (2.6 inches)	84%	moderate