January Weather in Oiso, Japan

Last updated: August 23, 2025

In January, the average temperature in Oiso, Japan hovers around 7°C (44°F), with a comfortable range that peaks at 17°C (63°F) and dips to a cooler 0°C (32°F). Expect a total precipitation of 69 mm (2.7 in) over about 7 days, accompanied by a relatively high average humidity of 76%. Plan accordingly for a mix of brisk air and refreshing rain!

January Temperature in Oiso

In January in Oiso, the average temperature is 7°C (44°F), with maximums reaching 17°C (63°F) and minimums dropping to as low as 0°C (32°F). Be sure to pack layers to stay comfortable while exploring the diverse weather conditions!

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

The chart illustrates January temperature patterns in Oiso, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oiso, January typically has an average temperature of 7°C (44°F), with highs reaching up to 17°C (63°F) and lows dropping to around 0°C (32°F).

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

January Precipitation in Oiso

In Oiso in January, the precipitation amount is 69 mm (2.7 in) over the course of 7 days.

January Precipitation Trends in Oiso

The chart displays monthly precipitation patterns in Oiso, 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 Oiso, January typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 7 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 Oiso

In Oiso in January humidity is 76%. With an average temperature of 7°C (44°F), this humidity feels like a chilly, damp blanket enveloping you, making outdoor activities less enjoyable and often leaving you feeling cold and clammy while traveling.

January Average Humidity in Oiso

This chart illustrates the average monthly humidity levels in Oiso, 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 Oiso is approximately 76%, 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 Oiso

In Oiso 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 Oiso for better planning.

Maximum UV Index Levels in Oiso for January

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

Data source: Oiso 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 Oiso Compares to Other Months

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

This table compares monthly weather conditions in Oiso, 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 (44°F)	69 mm (2.7 inches)	76%	moderate
February Weather	7°C (45°F)	75 mm (3.0 inches)	74%	moderate
March Weather	10°C (51°F)	195 mm (7.7 inches)	70%	very high
April Weather	13°C (57°F)	162 mm (6.4 inches)	74%	very high
May Weather	18°C (64°F)	166 mm (6.5 inches)	81%	extreme
June Weather	21°C (70°F)	224 mm (8.8 inches)	88%	extreme
July Weather	24°C (76°F)	263 mm (10.3 inches)	93%	extreme
August Weather	26°C (80°F)	159 mm (6.2 inches)	90%	extreme
September Weather	23°C (74°F)	235 mm (9.3 inches)	86%	very high
October Weather	19°C (66°F)	346 mm (13.6 inches)	83%	high
November Weather	14°C (58°F)	115 mm (4.5 inches)	80%	moderate
December Weather	9°C (49°F)	91 mm (3.6 inches)	78%	moderate