Tokyo
Japan
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
Tokyo, Japan

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A stunning view of the cityscape of Tokyo, Japan, taken at dusk
A stunning view of the cityscape of Tokyo, Japan, taken at dusk
Winter sets in December bringing the temperatures in Tokyo to low averages between 4°C (39.2°F) and 11°C (51.8°F). These can go lower especially on the extremely windy days and nights. Most activities are based on weather retreat indoors.
December remains one of the driest months with low precipitation of 43.2mm (1.7") fetched from only nine rainy days. Outdoors can be cold, but at least the weather stays dry and sunny with up to six hours of the sunshine per day.
The ocean gets colder with a low temperature of 19°C (66.2°F). As much as swimming can still go on, it is reserved for the brave and lovers of the cold waters.
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  • The average high temperature in December: 11.9°C

The warmest month (with the highest average high temperature) is August (30.8°C).
The month with the lowest average high temperature is January (9.6°C).

  • The average low temperature in December: 3.5°C

The month with the highest average low temperature is August (23°C).
The coldest month (with the lowest average low temperature) is January (0.9°C).

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  • The average humidity in December: 56%

The month with the highest relative humidity is July (77%).
The month with the lowest relative humidity is January (52%).

  • The average rainfall in December: 108.7mm

The wettest month (with the highest rainfall) is May (145.4mm).
The driest month (with the lowest rainfall) is February (58.2mm).

  • The average rainfall days in December: 11.8 days

The month with the highest number of rainy days is October (13 days).
The month with the lowest number of rainy days is July (8.4 days).

  • The average snowfall in December: 0mm

Months with the highest snowfall are January and February (50mm).
Months with the lowest snowfall are April, May, June, July, August, September, October, November and December (0mm).

  • The average snowfall days in December: 0.8 days

The month with the highest number of snowfall days is February (3.7 days).
Months with the lowest number of snowfall days are May, June, July, August, September, October and November (0 days).

  • The average sea temperature in December: 17.3°C

The best month for swimming (with the highest average sea temperature) is August (25.7°C).
The coldest month (with the lowest average sea temperature) is February (14°C).

  • The average daylight in December: 10h

The month with the longest days is June (Average daylight: 15h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in December: 5.7h

The month with most sunshine is January (Average sunshine: 6h).
The month with least sunshine is September (Average sunshine: 4h).

  • The average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 2).

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