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January Weather in Sai, Japan

Last updated: August 23, 2025

In January, the average temperature in Sai, Japan hovers around 1°C (34°F). Expect chilly conditions, with minimums dipping to -7°C (20°F) and maximums reaching 10°C (50°F). It’s also a wet month, with an average precipitation of 112 mm (4.4 in) spread over 18 days. Humidity levels remain high at 79%, adding to the cool atmosphere.

January Temperature in Sai

In January in Sai, the average temperature is 1°C (34°F). The maximum can reach 10°C (50°F), while the minimum can drop as low as -7°C (20°F). Be prepared for chilly conditions and pack warm clothing if you plan to visit during this time.

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

The chart illustrates January temperature patterns in Sai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sai, January typically has an average temperature of 1°C (34°F), with highs reaching up to 10°C (50°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec343340465259677269614938
Data source: Temperature data for Sai generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Sai

In Sai in January, the precipitation amount is 112 mm (4.4 in) over a span of 18 days.

January Precipitation Trends in Sai

The chart displays monthly precipitation patterns in Sai, 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 Sai, January typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec1121179398104112110188132156131168
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Sai

In Sai in January, humidity is 79%. With an average temperature of 1°C (34°F), this humidity feels like an icy blanket wrapping around you, making travel particularly brisk and requiring extra layers to stay warm and comfortable.

January Average Humidity in Sai

This chart illustrates the average monthly humidity levels in Sai, 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 Sai is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%77%78%86%91%95%97%89%82%78%77%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sai

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

Maximum UV Index Levels in Sai for January

The chart shows the monthly maximum UV Index (UVI) for Sai 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 Sai typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235891010118632
Data source: Sai 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 Sai Compares to Other Months

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

This table compares monthly weather conditions in Sai, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)112 mm (4.4 inches)79%low
February Weather1°C (34°F)117 mm (4.6 inches)78%moderate
March Weather4°C (40°F)93 mm (3.7 inches)77%moderate
April Weather8°C (46°F)98 mm (3.9 inches)78%very high
May Weather11°C (53°F)103 mm (4.1 inches)86%very high
June Weather15°C (59°F)112 mm (4.4 inches)91%very high
July Weather19°C (67°F)110 mm (4.3 inches)95%very high
August Weather22°C (72°F)187 mm (7.4 inches)97%extreme
September Weather21°C (69°F)132 mm (5.2 inches)89%very high
October Weather16°C (61°F)156 mm (6.1 inches)81%high
November Weather9°C (49°F)131 mm (5.1 inches)78%moderate
December Weather3°C (38°F)167 mm (6.6 inches)77%low

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