January Weather in Tosa, Japan

Last updated: August 23, 2025

In January, the average temperature in Tosa, Japan hovers around 7°C (45°F). While you might experience chilly minimums of -2°C (29°F), the days can warm up to a pleasant 18°C (66°F). Be prepared for some rain, with 69 mm (2.7 in) of precipitation expected over about 5 days. Plus, you can expect a 74% humidity level, making for a true atmospheric experience!

January Temperature in Tosa

In January in Tosa, the average temperature is 7°C (45°F), with maximums reaching 18°C (66°F) and minimums dropping as low as -2°C (29°F). It’s a great time to explore Tosa, so be sure to pack layers for varying weather conditions!

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

The chart illustrates January temperature patterns in Tosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tosa, January typically has an average temperature of 7°C (45°F), with highs reaching up to 18°C (66°F) and lows dropping to around -2°C (29°F).

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

January Precipitation in Tosa

In Tosa in January, the total precipitation amount is 69 mm (2.7 in) spread over a duration of 5 days.

January Precipitation Trends in Tosa

The chart displays monthly precipitation patterns in Tosa, 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 Tosa, January typically receives around 69 mm (2.7 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 Tosa

In Tosa in January, humidity is 74%. With an average temperature of 7°C (45°F), this humidity feels like a chilly blanket that clings to your skin, making outdoor activities feel more intense and requiring extra layers to stay comfortable while exploring.

January Average Humidity in Tosa

This chart illustrates the average monthly humidity levels in Tosa, 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 Tosa is approximately 74%, 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 Tosa

In Tosa in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Tosa for better planning.

Maximum UV Index Levels in Tosa for January

The chart shows the monthly maximum UV Index (UVI) for Tosa 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 Tosa typically reaches 4, which falls under the moderate exposure category.

Data source: Tosa 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 Tosa Compares to Other Months

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

This table compares monthly weather conditions in Tosa, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	69 mm (2.7 inches)	74%	moderate
February Weather	8°C (46°F)	100 mm (3.9 inches)	70%	high
March Weather	12°C (53°F)	179 mm (7.1 inches)	70%	very high
April Weather	15°C (59°F)	203 mm (8.0 inches)	76%	extreme
May Weather	19°C (67°F)	231 mm (9.1 inches)	82%	extreme
June Weather	22°C (72°F)	314 mm (12.4 inches)	86%	extreme
July Weather	26°C (79°F)	579 mm (22.8 inches)	91%	extreme
August Weather	27°C (81°F)	337 mm (13.3 inches)	88%	extreme
September Weather	25°C (76°F)	348 mm (13.7 inches)	85%	very high
October Weather	20°C (68°F)	337 mm (13.3 inches)	82%	high
November Weather	14°C (58°F)	81 mm (3.2 inches)	79%	high
December Weather	9°C (49°F)	80 mm (3.1 inches)	77%	moderate