January Weather in St. Thomas, Canada

Last updated: June 18, 2025

In January, the average temperature in St. Thomas, Canada hovers around -3°C (27°F), with extremes ranging from a chilly -21°C (-6°F) to a relatively mild 11°C (51°F). Expect 76 mm (3.0 in) of precipitation spread over 11 days, contributing to an average humidity of 90%. Stay warm and prepared!

January Temperature in St. Thomas

In January in St. Thomas, the average temperature is -3°C (27°F). The maximum can reach 11°C (51°F), while the minimum can drop as low as -21°C (-6°F). Be prepared for cold weather and pack accordingly when traveling during this time.

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

The chart illustrates January temperature patterns in St. Thomas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Thomas, January typically has an average temperature of -3°C (27°F), with highs reaching up to 11°C (51°F) and lows dropping to around -21°C (-6°F).

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

January Precipitation in St. Thomas

In St. Thomas in January, the total precipitation amount is 76 mm (3.0 in), recorded over a period of 11 days.

January Precipitation Trends in St. Thomas

The chart displays monthly precipitation patterns in St. Thomas, 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. Thomas, January typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 11 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. Thomas

In St. Thomas in January humidity is 90%. With an average temperature of -3°C (27°F), this humidity feels like a bitter chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to combat both the cold and the dampness in the air.

January Average Humidity in St. Thomas

This chart illustrates the average monthly humidity levels in St. Thomas, 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. Thomas is approximately 90%, 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. Thomas

In St. Thomas in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in St. Thomas, you can check the information here.

Maximum UV Index Levels in St. Thomas for January

The chart shows the monthly maximum UV Index (UVI) for St. Thomas 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. Thomas typically reaches 3, which falls under the moderate exposure category.

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

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

This table compares monthly weather conditions in St. Thomas, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	76 mm (3.0 inches)	90%	moderate
February Weather	-3°C (27°F)	79 mm (3.1 inches)	90%	moderate
March Weather	1°C (34°F)	81 mm (3.2 inches)	87%	moderate
April Weather	6°C (43°F)	106 mm (4.2 inches)	87%	very high
May Weather	13°C (55°F)	99 mm (3.9 inches)	82%	very high
June Weather	19°C (66°F)	93 mm (3.7 inches)	81%	very high
July Weather	22°C (72°F)	91 mm (3.6 inches)	79%	very high
August Weather	22°C (71°F)	96 mm (3.8 inches)	80%	very high
September Weather	18°C (65°F)	82 mm (3.2 inches)	81%	very high
October Weather	12°C (55°F)	123 mm (4.9 inches)	84%	high
November Weather	5°C (41°F)	94 mm (3.7 inches)	88%	moderate
December Weather	1°C (34°F)	77 mm (3.0 inches)	87%	low