January Weather in Guelph, Canada

Last updated: June 18, 2025

In January, the average temperature in Guelph, Canada hovers around -5°C (23°F). Expect chilly days with minimums dropping to -26°C (-15°F) and occasional highs reaching up to 12°C (54°F). With an average precipitation of 70 mm (2.8 in) spread over 8 days, the air feels quite humid, averaging at a brisk 90% humidity. Prepare accordingly for this frosty month! ❄️

January Temperature in Guelph

In January in Guelph, the average temperature is -5°C (23°F), with maximums reaching 12°C (54°F) and minimums dropping as low as -26°C (-15°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both cold and milder days.

January Weather in Guelph: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Guelph, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guelph, January typically has an average temperature of -5°C (23°F), with highs reaching up to 12°C (54°F) and lows dropping to around -26°C (-15°F).

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

January Precipitation in Guelph

In Guelph in January, the total precipitation amount is 70 mm (2.8 in), spread over the course of 8 days.

January Precipitation Trends in Guelph

The chart displays monthly precipitation patterns in Guelph, 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 Guelph, January typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 8 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 Guelph

In Guelph in January, humidity is 90%. With an average temperature of -5°C (23°F), this humidity feels like walking through an icy mist, making it challenging to stay warm while traveling as your clothes cling to your skin, and every breath feels damp and heavy in the frigid air.

January Average Humidity in Guelph

This chart illustrates the average monthly humidity levels in Guelph, 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 Guelph 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 Guelph

In Guelph 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 Guelph, you can visit Hourly UV Index in Guelph.

Maximum UV Index Levels in Guelph for January

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

Data source: Guelph 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 Guelph Compares to Other Months

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

This table compares monthly weather conditions in Guelph, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	70 mm (2.8 inches)	90%	low
February Weather	-5°C (24°F)	75 mm (2.9 inches)	90%	moderate
March Weather	0°C (32°F)	65 mm (2.5 inches)	87%	moderate
April Weather	6°C (42°F)	103 mm (4.1 inches)	87%	very high
May Weather	13°C (56°F)	97 mm (3.8 inches)	82%	very high
June Weather	19°C (66°F)	105 mm (4.1 inches)	81%	very high
July Weather	22°C (71°F)	77 mm (3.0 inches)	79%	very high
August Weather	20°C (69°F)	95 mm (3.7 inches)	80%	very high
September Weather	17°C (62°F)	71 mm (2.8 inches)	81%	high
October Weather	10°C (50°F)	101 mm (4.0 inches)	84%	moderate
November Weather	2°C (36°F)	78 mm (3.1 inches)	88%	moderate
December Weather	-2°C (29°F)	72 mm (2.8 inches)	87%	low