January weather - Winter 2025

Weather in January
Frequently asked questions
Average temperature 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 UV index in January

The Osaka Castle, in Osaka, Japan

Weather in January

In Osaka, the start of the year presents relatively cold conditions with temperatures, on balmy days, reaching up to 9.5°C (49.1°F). Moisture is a nuisance with humidity levels regularly hovering around 61%. Despite the low daylight hours, puffy clouds frequently hide the sun, making the days shorter and colder. The sea is at its coolest, discouraging any water-based activities for tourists. Snowflakes may grace the city a handful of days, reminding citizens that winter is in full effect.

Temperature

The month of January, characterized by an average high of 9.5°C (49.1°F) and a low of 2.8°C (37°F), is recognized as the coldest.

Humidity

In January, the average relative humidity is 61%.

Rainfall

In Osaka, in January, during 5.6 rainfall days, 45mm (1.77") of precipitation is typically accumulated. Throughout the year, in Osaka, there are 98.1 rainfall days, and 1279mm (50.35") of precipitation is accumulated.

Snowfall

Months with snowfall in Osaka, Japan, are January and February. The months with the most snowfall in Osaka are January and February, with an average 10mm (0.39") of accumulated snow.

Sea temperature

In Osaka, Japan, in January, the average water temperature is 15.2°C (59.4°F).
Note: Most people find it challenging to enjoy swimming in water that is 15.2°C (59.4°F). As water temperature falls below 21°C (69.8°F), controlling breathing grows increasingly difficult.

Daylight

In January, the average length of the day in Osaka is 10h and 8min.
On the first day of January, sunrise is at 07:04 and sunset at 16:57. On the last day of the month, sunrise is at 06:57 and sunset at 17:25 JST.

Sunshine

The month with the least sunshine is January, with an average of 4.6h of sunshine.

UV index

In January, the average daily maximum UV index in Osaka is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 3 in January interprets into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.

[Resources]

Frequently asked questions

What is the coldest month in Osaka?

January is the coldest month, with an average high-temperature of 9.5°C (49.1°F) and an average low-temperature of 2.8°C (37°F).

What are the temperatures in Osaka in January?

The average high-temperature, in January, in Osaka, is 9.5°C (49.1°F), while the average low-temperature is 2.8°C (37°F).

What is the average humidity in January in Osaka?

The average relative humidity in January in Osaka is 61%.

How much does it rain in Osaka in January?

In Osaka, Japan, in January, during 5.6 rainfall days, 45mm (1.77") of precipitation is typically accumulated.

What is the snowiest month in Osaka?

The months with the most snowfall in Osaka are January and February, with an average 10mm (0.39") of accumulated snow.

When does it start to snow in Osaka?

January is the first month it typically snows. Throughout January, in the average 5 snowfall days, it receives 10mm (0.39") of snow.

How cold is the water in January in Osaka?

In Osaka, in January, the average water temperature is 15.2°C (59.4°F). For swimming, a surface water temperature of 15.2°C (59.4°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).

How many hours of daylight does Osaka have in January?

The average day length in January is 10h and 8min.

When are sunrise and sunset in January in Osaka?

In January, on the first day of the month, sunrise is at 07:04 and sunset at 16:57. On the last day of the month, sunrise is at 06:57 and sunset at 17:25 JST.

What is the month with the least sunshine in Osaka?

With an average of 4.6h of sunshine, January has the least sunshine of the year.

How many hours of sunshine does Osaka have in January?

In Osaka, the average sunshine duration in January is 4.6h.

How high is the UV index in January in Osaka?

In January, the average daily maximum UV index in Osaka, Japan, is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to 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

12.3°C 54.1°F

9.5°C 49.1°F

10.2°C 50.4°F

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

1.9

6.3

Average sea temperature

Average daylight

Average sunshine

Average UV index

Average temperature in January
Osaka, Japan

Average high temperature in January: 9.5°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 January: 2.8°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).

[Resources]

Average humidity in January
Osaka, Japan

Average humidity in January: 61%

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

[Resources]

Average rainfall in January
Osaka, Japan

Average rainfall in January: 45.4mm

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

[Resources]

Average rainfall days in January
Osaka, Japan

Average rainfall days in January: 5.6 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).

[Resources]

Average snowfall in January
Osaka, Japan

Average snowfall in January: 10mm

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).

[Resources]

Average snowfall days in January
Osaka, Japan

Average snowfall days in January: 5 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).

[Resources]

Average sea temperature in January
Osaka, Japan

Average sea temperature in January: 15.2°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).

[Resources]

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

Average daylight in January: 10h and 1min

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 January: 4h and 4min

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).

[Resources]

Average UV index in January
Osaka, Japan

Average UV index in January: 3

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

[Resources]

January weather forecast
Osaka, Japan

Contents