January weather - Winter 2025

Weather in January
Frequently asked questions
Average temperature in January
Average pressure in January
Average wind speed in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average snowfall in January
Average snowfall days in January
Average sea temperature in January
Average daylight in January
Average sunshine in January
Average sunshine days in January
Average UV index in January
Average cloud cover in January
Average visibility in January

The cityscape of Tokyo, Japan, taken at dusk

Weather in January

January weather offers a chilly start to the year in Tokyo, Japan. It can be characterized by a high relative humidity of 59% and low average temperatures dropping to 2.8°C (37°F), which can lead to snowfall, but in minimal quantities of 5mm (0.2") spread across 1.3 days. The notable days can overwhelm with cloudy skies and minimal sunshine hours. A crisp touch in the air brought by the cold winds further adds to Tokyo's winter charm. Despite the cold, it's an ideal time for winter-loving explorers to tour the city.

Temperature

January, noted for its average high-temperature of 8.9°C (48°F) and an average low-temperature of 2.8°C (37°F), is considered the coldest month in Tokyo.

Humidity

January is the least humid month, with an average relative humidity of 59%.

Rainfall

In January, the rain falls for 7.3 days. Throughout January, 22mm (0.87") of precipitation is accumulated. Throughout the year, in Tokyo, there are 134.5 rainfall days, and 425mm (16.73") of precipitation is accumulated.

Snowfall

January through March are months with snowfall. January is the first month it typically snows in Tokyo, Japan. Throughout January, in the average 1.3 snowfall days, it receives 5mm (0.2") of snow. In Tokyo, during the entire year, snow falls for 4 days and aggregates up to 27mm (1.06") of snow.

Sea temperature

In Tokyo, the average seawater temperature in January is 15.7°C (60.3°F).
Note: For most individuals, swimming in 15.7°C (60.3°F) is not enjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing control becomes increasingly difficult.

Daylight

In January, the average length of the day is 10h and 3min.
On the first day of January in Tokyo, 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.

Sunshine

The average sunshine in January is 6.5h.

UV index

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Tokyo. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 3 in January interprets into the following advice:
Act with care - The suggestion to avoid sunburn is emphasized. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Updated: Jan 31, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What part of the year is the coldest in Tokyo?

With an average high-temperature of 8.9°C (48°F) and an average low-temperature of 2.8°C (37°F), January is the coldest month.

What is the usual temperature for Tokyo in January?

The average high-temperature and low-temperature during January are 8.9°C (48°F) and 2.8°C (37°F) respectively.

What is the least humid month in Tokyo?

The least humid month in Tokyo is January, with an average relative humidity of 59%.

What is the average humidity in January in Tokyo?

In Tokyo, the average relative humidity in January is 59%.

How many days does it rain in January in Tokyo?

In Tokyo, Japan, in January, during 7.3 rainfall days, 22mm (0.87") of precipitation is typically accumulated.

When does it start snowing in Tokyo?

January is the first month it typically snows. Throughout January, in the average 1.3 snowfall days, it receives 5mm (0.2") of snow.

What is the sea water temperature in January in Tokyo?

In Tokyo, the average seawater temperature in January is 15.7°C (60.3°F). For swimming, a surface water temperature of 15.7°C (60.3°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the average length of the day in January in Tokyo?

In January, the average day length in Tokyo, Japan, is 10h and 3min.

What time are sunrise and sunset in January in Tokyo?

On the first day of January in Tokyo, 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 many hours of sunshine does Tokyo have in January?

The average sunshine duration in January is 6.5h.

When is the lowest UV index in Tokyo?

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Tokyo.

How high is the UV index in January in Tokyo?

In Tokyo, Japan, the average daily maximum UV index in January is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

11.2°C 52.2°F

8.9°C 48°F

9.8°C 49.6°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

14.5km/h 9mph

14.9km/h 9.3mph

15.9km/h 9.9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.1

1.3

2.3

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

20.3

21.8

16.3

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Tokyo, Japan

Average high temperature in January: 8.9°C

The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (8.9°C).

Average low temperature in January: 2.8°C

The month with the highest average low temperature is August (25.1°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).

Average pressure in January
Tokyo, Japan

Average pressure in January: 1016.3mbar

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

Average wind speed in January
Tokyo, Japan

Average wind speed in January: 13.5km/h

The windiest month (with the highest average wind speed) is April (15.3km/h).
The calmest month (with the lowest average wind speed) is November (12.1km/h).

Average humidity in January
Tokyo, Japan

Average humidity in January: 59%

The month with the highest relative humidity is July (77%).
The month with the lowest relative humidity is January (59%).

Average rainfall in January
Tokyo, Japan

Average rainfall in January: 22mm

The wettest month (with the highest rainfall) is October (51mm).
The driest month (with the least rainfall) is December (21mm).

Average rainfall days in January
Tokyo, Japan

Average rainfall days in January: 7.3 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in January
Tokyo, Japan

Average snowfall in January: 5mm

The month with the highest snowfall is February (21mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in January
Tokyo, Japan

Average snowfall days in January: 1.3 days

The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average sea temperature in January
Tokyo, Japan

Average sea temperature in January: 15.7°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).

Average daylight in January /
Average sunshine in January
Tokyo, 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 48min).

Average sunshine days in January
Tokyo, Japan

Average sunshine days in January: 21.8 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is June (14.4 days).

Average UV index in January
Tokyo, Japan

Average UV index in January: 3

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 3).

Average cloud cover in January
Tokyo, Japan

Average cloud cover in January: 28

The months with the most cloud cover are June and October (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 28).

Average visibility in January
Tokyo, Japan

Average visibility in January: 10km

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

January weather forecast
Tokyo, Japan

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