January Weather in St. Catharines, Canada

Last updated: June 18, 2025

In St. Catharines, Canada, the average temperature in January hovers around -2°C (29°F), with extremes ranging from a chilly -18°C (-1°F) to a mild 12°C (54°F). Expect 77 mm (3.0 in) of precipitation spread over about 10 days, while the air remains notably moist with an average humidity of 91%.

January Temperature in St. Catharines

In January in St. Catharines, the average temperature is -2°C (29°F). Maximum can reach 12°C (54°F) and minimum can be as low as -18°C (-1°F). Be prepared for chilly conditions and pack accordingly for your travels!

January Weather in St. Catharines: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in St. Catharines, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Catharines, January typically has an average temperature of -2°C (29°F), with highs reaching up to 12°C (54°F) and lows dropping to around -18°C (-1°F).

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

January Precipitation in St. Catharines

In St. Catharines in January, the total precipitation amount is 77 mm (3.0 in) spread over a duration of 10 days.

January Precipitation Trends in St. Catharines

The chart displays monthly precipitation patterns in St. Catharines, 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 St. Catharines, January typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

January Humidity in St. Catharines

In St. Catharines in January, humidity is 91%. With an average temperature of -2°C (29°F), this humidity feels like a chilling embrace that can quickly sap your energy, making outdoor adventures uncomfortable and dampening the joy of exploration.

January Average Humidity in St. Catharines

This chart illustrates the average monthly humidity levels in St. Catharines, 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 St. Catharines is approximately 91%, 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 St. Catharines

In St. Catharines in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in St. Catharines, you can visit Hourly UV Index in St. Catharines.

Maximum UV Index Levels in St. Catharines for January

The chart shows the monthly maximum UV Index (UVI) for St. Catharines 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 St. Catharines typically reaches 2, which falls under the low exposure category.

Data source: St. Catharines 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 St. Catharines Compares to Other Months

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

This table compares monthly weather conditions in St. Catharines, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	77 mm (3.0 inches)	91%	low
February Weather	-2°C (29°F)	86 mm (3.4 inches)	91%	moderate
March Weather	1°C (35°F)	71 mm (2.8 inches)	88%	moderate
April Weather	6°C (43°F)	119 mm (4.7 inches)	88%	very high
May Weather	12°C (54°F)	101 mm (4.0 inches)	82%	very high
June Weather	18°C (65°F)	82 mm (3.2 inches)	79%	very high
July Weather	23°C (73°F)	106 mm (4.2 inches)	77%	very high
August Weather	22°C (72°F)	80 mm (3.1 inches)	72%	very high
September Weather	19°C (66°F)	69 mm (2.7 inches)	76%	high
October Weather	13°C (56°F)	126 mm (4.9 inches)	83%	moderate
November Weather	5°C (42°F)	86 mm (3.4 inches)	88%	moderate
December Weather	1°C (35°F)	86 mm (3.4 inches)	87%	low