nomadseason

December Weather in Niihama, Japan

Last updated: August 23, 2025

In Niihama, Japan, the average temperature in December hovers around 8°C (46°F), with daily highs reaching up to 20°C (68°F) and dipping as low as 0°C (32°F). You'll also encounter about 80 mm (3.1 in) of precipitation spread across 12 days, contributing to an average humidity of 77%. Be sure to pack accordingly for a potentially wet and cool climate!

December Temperature in Niihama

In December in Niihama, the average temperature is 8°C (46°F), with maximums reaching 20°C (68°F) and minimums dropping as low as 0°C (32°F). This makes it a perfect time to explore Niihama, so be sure to pack layers for varying weather conditions!

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

The chart illustrates December temperature patterns in Niihama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Niihama, December typically has an average temperature of 8°C (46°F), with highs reaching up to 20°C (68°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec424249566571788175665546
Data source: Temperature data for Niihama generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Niihama

In Niihama in December, the total precipitation amount is 80 mm (3.1 in) spread over 12 days.

December Precipitation Trends in Niihama

The chart displays monthly precipitation patterns in Niihama, 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 Niihama, December typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec65851291421481993571812372536980
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Niihama

In Niihama 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 Niihama

This chart illustrates the average monthly humidity levels in Niihama, 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 Niihama is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%70%70%76%83%86%91%88%85%82%79%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Niihama

In Niihama in December, 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 Niihama for better planning.

Maximum UV Index Levels in Niihama for December

The chart shows the monthly maximum UV Index (UVI) for Niihama 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 Niihama typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121210764
Data source: Niihama 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 Niihama Compares to Other Months

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

This table compares monthly weather conditions in Niihama, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)65 mm (2.6 inches)74%moderate
February Weather6°C (43°F)85 mm (3.4 inches)70%high
March Weather9°C (49°F)129 mm (5.1 inches)70%very high
April Weather13°C (57°F)142 mm (5.6 inches)76%very high
May Weather18°C (65°F)148 mm (5.8 inches)82%extreme
June Weather22°C (71°F)199 mm (7.8 inches)86%extreme
July Weather26°C (79°F)357 mm (14.1 inches)91%extreme
August Weather27°C (82°F)181 mm (7.1 inches)88%extreme
September Weather24°C (75°F)237 mm (9.3 inches)85%very high
October Weather19°C (66°F)253 mm (10.0 inches)82%high
November Weather13°C (56°F)69 mm (2.7 inches)79%high
December Weather8°C (46°F)80 mm (3.1 inches)77%moderate

Compare Niihama's Climate with Cities Worldwide