January weather forecast
Roppongi, Japan

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Weather in January

January, the same as December, in Roppongi, Japan, is a frosty winter month, with an average temperature fluctuating between 8.8°C (47.8°F) and 3°C (37.4°F).

Temperature

In Roppongi, January is the month with the lowest recorded average temperatures, measuring a high of 8.8°C (47.8°F) and a low of 3°C (37.4°F).

Humidity

With an average relative humidity of 60%, January is the least humid month in Roppongi.

Rainfall

In Roppongi, in January, it is raining for 4.5 days, with typically 13mm (0.51") of accumulated precipitation. In Roppongi, during the entire year, the rain falls for 125.3 days and collects up to 359mm (14.13") of precipitation.

Snowfall

January and February are months with snowfall. January is the first month it typically snows in Roppongi, Japan. Throughout January, in the average 0.6 snowfall days, it receives 1mm (0.04") of snow. In Roppongi, during the entire year, snow falls for 2.1 days and aggregates up to 5mm (0.2") of snow.

Daylight

In January, the average length of the day is 10h and 4min.
On the first day of the month, sunrise is at 06:50 and sunset at 16:37. On the last day of January, sunrise is at 06:42 and sunset at 17:06 JST.

Sunshine

The average sunshine in January is 6.5h.

UV index

January is the month with the lowest UV index in Roppongi, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 2 in January translates into these instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

What is the coldest time of year in Roppongi?

Roppongi experiences its lowest temperatures in January, with an average peak of 8.8°C (47.8°F) and a low of 3°C (37.4°F).

What is the temperature in January in Roppongi?

In January, in Roppongi, the average high-temperature is 8.8°C (47.8°F), and the average low-temperature is 3°C (37.4°F).

What is the least humid month in Roppongi?

The least humid month in Roppongi, Japan, is January, with an average relative humidity of 60%.

What is the average humidity in January in Roppongi?

In Roppongi, Japan, the average relative humidity in January is 60%.

How much does it rain in Roppongi in January?

In Roppongi, Japan, during January, the rain falls for 4.5 days and regularly aggregates up to 13mm (0.51") of precipitation.

When does it start snowing in Roppongi?

January is the first month it typically snows. Throughout January, in the average 0.6 snowfall days, it receives 1mm (0.04") of snow.

How many hours of daylight does Roppongi have in January?

The average day length in January in Roppongi is 10h and 4min.

What time are sunrise and sunset in January in Roppongi?

In January, on the first day of the month, sunrise is at 06:50 and sunset at 16:37. On the last day of the month, sunrise is at 06:42 and sunset at 17:06 JST.

How long on average sun shines in January in Roppongi?

The average sunshine duration in January is 6.5h.

When is the lowest UV index in Roppongi?

With an average maximum UV index of 2, January is the month with the lowest UV index in Roppongi, Japan.

What is the UV index intensity in January in Roppongi?

In Roppongi, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in January
Roppongi, Japan

Average temperature in January - Roppongi, Japan
  • Average high temperature in January: 8.8°C

The warmest month (with the highest average high temperature) is August (30.6°C).
The month with the lowest average high temperature is January (8.8°C).

  • Average low temperature in January: 3°C

The month with the highest average low temperature is August (24.9°C).
The coldest month (with the lowest average low temperature) is January (3°C).

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Average pressure in January
Roppongi, Japan

Average pressure in January - Roppongi, Japan
  • Average pressure in January: 1016.1mbar

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).

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Average wind speed in January
Roppongi, Japan

Average wind speed in January - Roppongi, Japan
  • Average wind speed in January: 14.3km/h

The windiest month (with the highest average wind speed) is April (15.6km/h).
The calmest month (with the lowest average wind speed) is November (12.3km/h).

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Average humidity in January
Roppongi, Japan

Average humidity in January - Roppongi, Japan
  • Average humidity in January: 60%

The month with the highest relative humidity is July (79%).
The month with the lowest relative humidity is January (60%).

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Average rainfall in January
Roppongi, Japan

Average rainfall in January - Roppongi, Japan
  • Average rainfall in January: 13mm

The wettest month (with the highest rainfall) is September (54mm).
The driest month (with the least rainfall) is February (10mm).

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Average rainfall days in January
Roppongi, Japan

Average rainfall days in January - Roppongi, Japan
  • Average rainfall days in January: 4.5 days

The month with the highest number of rainy days is July (16.1 days).
The month with the least rainy days is January (4.5 days).

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Average snowfall in January
Roppongi, Japan

Average snowfall in January - Roppongi, Japan
  • Average snowfall in January: 1mm

The month with the highest snowfall is February (4mm).
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 January
Roppongi, Japan

Average snowfall days in January - Roppongi, Japan
  • Average snowfall days in January: 0.6 days

The month with the highest number of snowfall days is February (1.2 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 daylight in January /
Average sunshine in January
Roppongi, Japan

Average daylight in January / Average sunshine in January - Roppongi, Japan
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in January: 6h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).

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Average sunshine days in January
Roppongi, Japan

Average sunshine days in January - Roppongi, Japan
  • Average sunshine days in January: 25.4 days

The month with the most sunshine days is January (25.4 days).
The month with the least sunshine days is June (11.5 days).

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Average UV index in January
Roppongi, Japan

Average UV index in January - Roppongi, Japan
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).

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Average cloud cover in January
Roppongi, Japan

Average cloud cover in January - Roppongi, Japan
  • Average cloud cover in January: 28

The months with the most cloud cover are June and October (Cloud cover 44).
The month with the least cloud cover is January (Cloud cover 28).

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Average visibility in January
Roppongi, Japan

Average visibility in January - Roppongi, Japan
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).

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Roppongi, Japan

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