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December Weather in Iwaki, Japan

Last updated: August 23, 2025

In Iwaki, Japan during December, the average temperature hovers around 8°C (46°F), with a comfortable range where the minimum dips to 0°C (33°F) and the maximum reaches 18°C (65°F). Expect about 73 mm (2.9 in) of precipitation across 9 days, contributing to an average humidity level of 77%.

December Temperature in Iwaki

In December in Iwaki, the average temperature is 8°C (46°F), with maximums reaching up to 18°C (65°F) and minimums dipping as low as 0°C (33°F). This moderate climate makes Iwaki an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

December Weather in Iwaki: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Iwaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwaki, December typically has an average temperature of 8°C (46°F), with highs reaching up to 18°C (65°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec414247536166727671645546
Data source: Temperature data for Iwaki 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.

December Precipitation in Iwaki

In Iwaki in December, the precipitation amount is 73 mm (2.9 in), occurring over the course of 9 days.

December Precipitation Trends in Iwaki

The chart displays monthly precipitation patterns in Iwaki, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Iwaki, December typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec57451691361541362021371862718573
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Iwaki

In Iwaki in December humidity is 77%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill wrapping around you, making outdoor activities less inviting and requiring extra layers to stay comfortable while exploring.

December Average Humidity in Iwaki

This chart illustrates the average monthly humidity levels in Iwaki, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Iwaki is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Iwaki

In Iwaki in December, 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 Iwaki, you can check the information here.

Maximum UV Index Levels in Iwaki for December

The chart shows the monthly maximum UV Index (UVI) for Iwaki in December, 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 December, the maximum UV index in Iwaki typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011119653
Data source: Iwaki December 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 December Weather in Iwaki Compares to Other Months

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

This table compares monthly weather conditions in Iwaki, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)57 mm (2.2 inches)76%moderate
February Weather6°C (42°F)45 mm (1.8 inches)75%moderate
March Weather8°C (47°F)169 mm (6.6 inches)72%high
April Weather11°C (53°F)136 mm (5.4 inches)73%very high
May Weather16°C (61°F)154 mm (6.1 inches)80%very high
June Weather19°C (66°F)136 mm (5.3 inches)87%very high
July Weather22°C (72°F)202 mm (8.0 inches)92%extreme
August Weather25°C (76°F)137 mm (5.4 inches)90%extreme
September Weather22°C (72°F)186 mm (7.3 inches)84%very high
October Weather18°C (64°F)271 mm (10.7 inches)80%high
November Weather13°C (55°F)85 mm (3.4 inches)77%moderate
December Weather8°C (46°F)73 mm (2.9 inches)77%moderate

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