December weather forecast
Osaka, Japan

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The Osaka Castle, in Osaka, Japan
The Osaka Castle, in Osaka, Japan

Weather in December

December in Osaka seals the year's end with the coldest temperatures dropping to as low as 5.1°C (41.2°F). Despite the dip in temperatures, moisture remains as a persistent feature with relative humidity hovering around 62%. Though the sun is visible for a shorter duration, bright days are still prevalent, providing scant warmth. Snowfall reappears after a lengthy hiatus, signifying December as the beginning of wintry conditions. As expected, sea temperatures drop further, and the sea appears more grey than blue, marking the start of a new winter cycle.

Temperature

The start of December in Osaka involves a temperature drop, moving from an enjoyable 17.6°C (63.7°F) in November to a cool 12.3°C (54.1°F). Osaka experiences a nighttime temperature average of 5.1°C (41.2°F) during December.

Humidity

In December, the average relative humidity is 62%.

Rainfall

The month with the least rainfall is December, when the rain falls for 5.5 days and typically collects 44mm (1.73") of precipitation.

Snowfall

March through December are months without snowfall.

Sea temperature

In December, the average sea temperature is 17.8°C (64°F).
Note: When the surface water temperature is 17.8°C (64°F), most do not enjoy swimming. Breathing control becomes more complex as temperatures drop below 21°C (69.8°F).

Daylight

December has the shortest days of the year, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 06:46 and sunset at 16:47. On the last day of December, sunrise is at 07:04 and sunset at 16:57 JST.

Sunshine

The average sunshine in December in Osaka is 4.9h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In December, the maximum UV index of 2 suggests this advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. To protect against the Sun's most potent rays, avoid direct exposure around midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
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Frequently asked questions

What is the temperature in December in Osaka?

The high-temperature, in December, in Osaka, is 12.3°C (54.1°F), while the low-temperature averages to 5.1°C (41.2°F). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is appraised at 33°C (91.4°F).

What is the average humidity in December in Osaka?

The average relative humidity in December in Osaka, Japan, is 62%.

What is the driest month in Osaka?

The month with the least rainfall is December, when the rain falls for 5.5 days and typically collects 44mm (1.73") of precipitation.

How much does it rain in Osaka in December?

In Osaka, Japan, during December, the rain falls for 5.5 days and regularly aggregates up to 44mm (1.73") of precipitation.

When it does not snow in Osaka?

March through December are months without snowfall in Osaka, Japan.

Does it snow in Osaka in December?

In Osaka, in December, it doesn't snow. In January, it regularly snows.

What is the sea water temperature in December in Osaka?

In December, the average sea temperature is 17.8°C (64°F). Swimming in 17.8°C (64°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the month with the shortest days in Osaka?

With an average of 9h and 54min of daylight, December has the shortest days of the year in Osaka.

How many hours of daylight does Osaka have in December?

The average day length in December is 9h and 53min.

What time are sunrise and sunset in December in Osaka?

In December, on the first day of the month, sunrise is at 06:46 and sunset at 16:47. On the last day of the month, in Osaka, sunrise is at 07:04 and sunset at 16:57 JST.

How long on average sun shines in December in Osaka?

The average sunshine duration in December in Osaka is 4.9h.

When is the lowest UV index in Osaka?

The month with the lowest UV index in Osaka is December, with an average maximum UV index of 2.

What is the UV index intensity in December in Osaka?

In December, the average daily maximum UV index in Osaka is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Osaka, Japan

Average temperature in December - Osaka, Japan
  • Average high temperature in December: 12.3°C

The warmest month (with the highest average high temperature) is August (33.4°C).
The month with the lowest average high temperature is January (9.5°C).

  • Average low temperature in December: 5.1°C

The month with the highest average low temperature is August (25.4°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).

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Average humidity in December
Osaka, Japan

Average humidity in December - Osaka, Japan
  • Average humidity in December: 62%

The month with the highest relative humidity is July (70%).
The months with the lowest relative humidity are March and April (59%).

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Average rainfall in December
Osaka, Japan

Average rainfall in December - Osaka, Japan
  • Average rainfall in December: 43.8mm

The wettest month (with the highest rainfall) is June (184.5mm).
The driest month (with the least rainfall) is December (43.8mm).

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Average rainfall days in December
Osaka, Japan

Average rainfall days in December - Osaka, Japan
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is June (11.2 days).
The month with the least rainy days is December (5.5 days).

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Average snowfall in December
Osaka, Japan

Average snowfall in December - Osaka, Japan
  • Average snowfall in December: 0mm

The months with the highest snowfall are January and February (10mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in December
Osaka, Japan

Average snowfall days in December - Osaka, Japan
  • Average snowfall days in December: 1.9 days

The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in December
Osaka, Japan

Average sea temperature in December - Osaka, Japan
  • Average sea temperature in December: 17.8°C

The best month for swimming (with the highest average sea temperature) is August (27.7°C).
The coldest months (with the lowest average sea temperature) are February and March (13.9°C).

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Average daylight in December /
Average sunshine in December
Osaka, Japan

Average daylight in December / Average sunshine in December - Osaka, Japan
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is August (Average sunshine: 7h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average UV index in December
Osaka, Japan

Average UV index in December - Osaka, Japan
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 11).
The month with the lowest UV index is December (UV index 2).

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Osaka, Japan

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