January Weather in Port Saint John, United States

Last updated: June 24, 2025

In January, the average temperature in Port Saint John, United States hovers around 17°C (64°F), with temperatures ranging from a chilly 2°C (36°F) to a warm 27°C (82°F). Expect 38 mm (1.5 in) of precipitation over about 5 days, contributing to an average humidity level of 83%. Be prepared for a mix of weather as you explore!

January Temperature in Port Saint John

In January in Port Saint John, the average temperature is 17°C (64°F). The maximum can reach 27°C (82°F) and the minimum can be as low as 2°C (36°F). Travelers can expect mild weather, making it a great time to explore Port Saint John.

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

The chart illustrates January 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, January typically has an average temperature of 17°C (64°F), with highs reaching up to 27°C (82°F) and lows dropping to around 2°C (36°F).

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

January Precipitation in Port Saint John

In Port Saint John in January, the total precipitation amount is 38 mm (1.5 in) spread over a duration of 5 days.

January Precipitation Trends in Port Saint John

The chart displays monthly precipitation patterns in Port Saint John, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Port Saint John, January typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Port Saint John

In Port Saint John in January, humidity is 83%. With an average temperature of 17°C (64°F), this humidity feels like a warm, heavy blanket wrapping around you, making travel feel sluggish and prompting you to seek the nearest shade or air-conditioned escape.

January Average Humidity in Port Saint John

This chart illustrates the average monthly humidity levels in Port Saint John, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Port Saint John is approximately 83%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Port Saint John

In Port Saint John in January, 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 Port Saint John, you can refer to this Hourly UV Index in Port Saint John.

Maximum UV Index Levels in Port Saint John for January

The chart shows the monthly maximum UV Index (UVI) for Port Saint John in January, 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 January, the maximum UV index in Port Saint John typically reaches 6, which falls under the high exposure category.

Data source: Port Saint John January 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 January 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 January’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 January’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