January weather forecast
Yokohama, Japan

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Weather in January

January in Yokohama ushers in the new year with relatively mild weather, characterized by moderate temperatures ranging from 4°C (39.2°F) at night to a daytime high of 9.3°C (48.7°F). The arrival of winter is accompanied by increased humidity and the potential for brief showers. A noticeable decrease in pressure signals the transition from the relatively calm climates of late autumn to harsh winter weather. Cool winds sweep in from the shore, further lowering temperatures. The city sees snowfall on rare instances, making Yokohoma's winter uniquely picturesque.

Temperature

January proves to be the coldest month in Yokohama, recording an average maximum temperature of 9.3°C (48.7°F) and a minimum temperature of 4°C (39.2°F).

Humidity

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

Rainfall

In January, the rain falls for 8.3 days. Throughout January, 44mm (1.73") of precipitation is accumulated. In Yokohama, Japan, during the entire year, the rain falls for 160.5 days and collects up to 884mm (34.8") of precipitation.

Snowfall

January through March are months with snowfall in Yokohama. January is the first month it typically snows in Yokohama. Throughout January, in the average 0.7 snowfall days, it receives 2mm (0.08") of snow. Throughout the year, in Yokohama, there are 2.8 snowfall days, and 25mm (0.98") of snow is accumulated.

Sea temperature

In Yokohama, in January, the average water temperature is 16.9°C (62.4°F).
Note: Swimming in 16.9°C (62.4°F) is not an enjoyable experience for most. Breathing becomes progressively more challenging as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in January is 10h and 4min.
On the first day of January in Yokohama, sunrise is at 06:50 and sunset at 16:38. On the last day of the month, sunrise is at 06:42 and sunset at 17:07 JST.

Sunshine

In Yokohama, the average sunshine in January is 6.3h.

UV index

The months with the lowest UV index in Yokohama are January through March and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 3 in January transforms into this advice:
Be vigilant - Suggestions to stave off sun damage are provided. 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. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Updated: Jan 31, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What are the coldest months in Yokohama?

January stands out as Yokohama's coldest month, with an average high-temperature of 9.3°C (48.7°F) and a low-temperature of 4°C (39.2°F).

What are January temperatures in Yokohama?

The high-temperature, in January, in Yokohama, is 9.3°C (48.7°F), while the low-temperature averages to 4°C (39.2°F).

What is the least humid month in Yokohama?

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

What is the average humidity in January in Yokohama?

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

How many days does it rain in January in Yokohama?

In Yokohama, in January, it is raining for 8.3 days, with typically 44mm (1.73") of accumulated precipitation.

When does it start snowing in Yokohama?

January is the first month it typically snows in Yokohama, Japan. Throughout January, in the average 0.7 snowfall days, it receives 2mm (0.08") of snow.

How cold is the water in January in Yokohama?

In January, the average sea temperature in Yokohama, Japan, is 16.9°C (62.4°F). For swimming, a surface water temperature of 16.9°C (62.4°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 Yokohama?

In January, the average day length in Yokohama is 10h and 4min.

When are sunrise and sunset in January in Yokohama?

On the first day of January in Yokohama, Japan, sunrise is at 06:50 and sunset at 16:38. On the last day of the month, sunrise is at 06:42 and sunset at 17:07 JST.

How many hours of sunshine does Yokohama have in January?

In Yokohama, the average sunshine duration in January is 6.3h.

What are the months with the lowest UV index in Yokohama?

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

How high is the UV index in January in Yokohama?

In Yokohama, Japan, the average daily maximum UV index in January is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in January
Yokohama, Japan

Average temperature in January - Yokohama, Japan
  • Average high temperature in January: 9.3°C

The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (9.3°C).

  • Average low temperature in January: 4°C

The month with the highest average low temperature is August (25.3°C).
The coldest month (with the lowest average low temperature) is January (4°C).

Average pressure in January
Yokohama, Japan

Average pressure in January - Yokohama, Japan
  • Average pressure in January: 1016.2mbar

The month with the highest atmospheric pressure is November (1018mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).

Average wind speed in January
Yokohama, Japan

Average wind speed in January - Yokohama, Japan
  • Average wind speed in January: 16km/h

The windiest month (with the highest average wind speed) is April (17.9km/h).
The calmest month (with the lowest average wind speed) is June (14.2km/h).

Average humidity in January
Yokohama, Japan

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

The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is January (60%).

Average rainfall in January
Yokohama, Japan

Average rainfall in January - Yokohama, Japan
  • Average rainfall in January: 44mm

The wettest month (with the highest rainfall) is October (126mm).
The driest month (with the least rainfall) is December (40mm).

Average rainfall days in January
Yokohama, Japan

Average rainfall days in January - Yokohama, Japan
  • Average rainfall days in January: 8.3 days

The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in January
Yokohama, Japan

Average snowfall in January - Yokohama, Japan
  • Average snowfall in January: 2mm

The month with the highest snowfall is February (22mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in January
Yokohama, Japan

Average snowfall days in January - Yokohama, Japan
  • Average snowfall days in January: 0.7 days

The month with the highest number of snowfall days is February (1.6 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
Yokohama, Japan

Average sea temperature in January - Yokohama, Japan
  • Average sea temperature in January: 16.9°C

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest months (with the lowest average sea temperature) are February and March (16.2°C).

Average daylight in January /
Average sunshine in January
Yokohama, Japan

Average daylight in January / Average sunshine in January - Yokohama, 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 2min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

Average sunshine days in January
Yokohama, Japan

Average sunshine days in January - Yokohama, Japan
  • Average sunshine days in January: 20.8 days

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is October (11.7 days).

Average UV index in January
Yokohama, Japan

Average UV index in January - Yokohama, 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 and December (UV index 3).

Average cloud cover in January
Yokohama, Japan

Average cloud cover in January - Yokohama, Japan
  • Average cloud cover in January: 30

The month with the most cloud cover is October (Cloud cover 44).
The month with the least cloud cover is January (Cloud cover 30).

Average visibility in January
Yokohama, Japan

Average visibility in January - Yokohama, 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).

Yokohama, Japan

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