January weather forecastSendai, Japan

January

Weather in January

The year commences with chilly and relatively dry conditions in Sendai, Japan, quite different from what will ensue in the months to come. Rare is a day without some incipient signs of snow, a characteristic that adds a unique touch to January in Sendai. Wind speeds reach their zenith, causing the perceived temperatures to plummet even further. Although daylight hours are in short supply, January has the distinction of having the highest measure of pressure from 1016.2mb, only surpassed in the later part of the year. The month is certainly more conducive to snowball fights than beach outings, given the temperature ranges from -1.7°C (28.9°F) to a maximum of 3.3°C (37.9°F) on warmer days, and snowfall averages at 62mm (2.44").

Temperature

With average high and low temperatures of 3.3°C (37.9°F) and -1.7°C (28.9°F) respectively, January is Sendai's coldest month.

Humidity

In Sendai, the average relative humidity in January is 78%.

Rainfall

In January, in Sendai, the rain falls for 8.7 days. Throughout January, 31mm (1.22") of precipitation is accumulated. Throughout the year, in Sendai, there are 152.2 rainfall days, and 720mm (28.35") of precipitation is accumulated.

Snowfall

January through April and December are months with snowfall in Sendai. In Sendai, during January, snow falls for 7.9 days and regularly aggregates up to 62mm (2.44") of snow. Throughout the year, there are 27.1 snowfall days, and 195mm (7.68") of snow is accumulated.

Sea temperature

In Sendai, the average seawater temperature in January is 11.3°C (52.3°F).
Note: Beware of 11.3°C (52.3°F) waters at 13°C (55.4°F), they're uninviting, and a dip below 10°C (50°F) has risks of breath loss and cold shock, contingent on health.

Daylight

In Sendai, the average length of the day in January is 9h and 51min.
On the first day of January in Sendai, sunrise is at 06:53 and sunset at 16:26. On the last day of the month, sunrise is at 06:42 and sunset at 16:56 JST.

Sunshine

With an average of 5.1h of sunshine, January has the least sunshine of the year.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 2 during January leads to these advisories:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.

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

Frequently asked questions

January, on average, is the coldest month in Sendai, registering a high temperature of 3.3°C (37.9°F) and a low of -1.7°C (28.9°F).

The high-temperature, in January, in Sendai, is 3.3°C (37.9°F), while the low-temperature averages to -1.7°C (28.9°F).

The average relative humidity in January is 78%.

In Sendai, during January, the rain falls for 8.7 days and regularly aggregates up to 31mm (1.22") of precipitation.

In January, in Sendai, Japan, it is snowing for 7.9 days. Throughout January, 62mm (2.44") of snow is accumulated.

In Sendai, Japan, in January, the average water temperature is 11.3°C (52.3°F). Swimming in 11.3°C (52.3°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

In Sendai, Japan, the average day length in January is 9h and 51min.

In January, on the first day of the month, sunrise is at 06:53 and sunset at 16:26. On the last day of the month, in Sendai, Japan, sunrise is at 06:42 and sunset at 16:56 JST.

January has the least sunshine of the year, with an average of 5.1h of sunshine.

In Sendai, the average sunshine duration in January is 5.1h.

The months with the lowest UV index in Sendai, Japan, are January through March, November and December, with an average maximum UV index of 2.

The average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a minimal 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

6.4°C

3.3°C

4.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

15.3km/h

15.7km/h

15.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

4.3

7.9

9.2

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

17.3

13.2

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Sendai, Japan

Average high temperature in January: 3.3°C

The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (3.3°C).

Average low temperature in January: -1.7°C

The month with the highest average low temperature is August (21.4°C).
The coldest months (with the lowest average low temperature) are January and February (-1.7°C).

Average pressure in January
Sendai, Japan

Average pressure in January: 1016.2mbar

The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).

Average wind speed in January
Sendai, Japan

Average wind speed in January: 14.4km/h

The windiest month (with the highest average wind speed) is January (14.4km/h).
The calmest month (with the lowest average wind speed) is July (8.1km/h).

Average humidity in January
Sendai, Japan

Average humidity in January: 78%

The month with the highest relative humidity is July (84%).
The months with the lowest relative humidity are April and May (72%).

Average rainfall in January
Sendai, Japan

Average rainfall in January: 31mm

The wettest months (with the highest rainfall) are July and October (111mm).
The driest month (with the least rainfall) is February (22mm).

Average rainfall days in January
Sendai, Japan

Average rainfall days in January: 8.7 days

The month with the highest number of rainy days is July (20.7 days).
The month with the least rainy days is January (8.7 days).

Average snowfall in January
Sendai, Japan

Average snowfall in January: 62mm

The month with the highest snowfall is February (63mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).

Average snowfall days in January
Sendai, Japan

Average snowfall days in January: 7.9 days

The month with the highest number of snowfall days is February (9.2 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).

Average sea temperature in January
Sendai, Japan

Average sea temperature in January: 11.3°C

The best month for swimming (with the highest average sea temperature) is August (23.9°C).
The coldest month (with the lowest average sea temperature) is March (7.5°C).

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

Average daylight in January: 9h and 48min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

Average sunshine in January: 5h and 6min

The month with the most sunshine is May (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).

Average sunshine days in January
Sendai, Japan

Average sunshine days in January: 17.3 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (7.2 days).

Average UV index in January
Sendai, Japan

Average UV index in January: 2

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).