Climate and monthly weather forecast
Osaka, Japan

The Osaka Castle, in Osaka, Japan
The Osaka Castle, in Osaka, Japan

The climate of Osaka

Osaka, Japan, falls under the Cfa category of Köppen climate classification. This indicates that the city experiences a humid subtropical climate void of dry season. Geographically, Osaka is located in the Kansai region in the southern-central region of Japan's main island Honshū.

Initiating with temperature highs, an upward trend characterizes the city's weather. January witnesses the lowest peak at 9.5°C, progressing to the summer highs in August at 33.4°C. Similarly, the downward spiral of temperatures ensues from 24.5°C in September to 12.3°C in December. Low temperatures reflect a somewhat similar pattern, fluctuating from 2.8°C in January to a summer peak of 25.4°C in August, then cool down to 5.1°C in December.

Rainfall varies significantly throughout the year, with a general rise from January through June, peaking in the monsoon month of June with about 185mm of precipitation. After this summit, rainfall declines gradually until it reaches a trough in December with only 44mm. Parallel to the precipitation, the number of rainfall days follows an analogous pattern, spiking from 5.6 days in January to 11.2 days in June, then ebbing away to 5.5 days by December.

Coupled with the humidity, it maintains a narrow range throughout the year, oscillating between 59% and 70%, therefore characterizing Osaka's humid subtropical climate. Besides, a conspicuous absence of snowfall from March to November is noticeable, lending a unique aspect to Osaka's weather.

The best time to visit Osaka

Analyzing the provided climatological data, the most favorable period to visit Osaka extends from April to June. During these months, the city undergoes a perfect balance of moderate temperatures, ranging from highs of 19.9°C to 27.8°C and lows varying from 10.7°C to 20°C. Though rainfall starts ascending in this period, peaking in June with 185mm, it usually does not inhibit outdoor activities. Moreso, the city basks in longer daylight hours, a spectrum between 13.1h to 14.5h, backed by a maximum UV index indicating plentiful sunshine.

The worst time to visit Osaka

Despite the personal preferences of travelers, Osaka weather data suggests avoiding the city during the months of July and August. In this period, high temperatures soar, reaching uncomfortable peaks of 31.6°C and 33.4°C respectively. The high humidity of 70% and 66% can make the heat feel even more oppressive. Furthermore, despite a dip in rainfall to 157mm and 91mm respectively, summer storms could occasionally disrupt travel plans.

Spring weather in Osaka

Spring in Osaka, which stretches from March to May, brings mild weather conditions. High temperatures hover between 13.7°C to 24.5°C and lows from 5.6°C to 15.6°C, making sightseeing activities quite pleasant. The city receives moderate rainfall during this period, and humidity ranges from 59% to 62%. Daylight hours are also on the rise, making it ideal for outdoor activities.

Summer weather in Osaka

The months from June to August reveal a hotter facet of Osaka. Highs escalate from 27.8°C in June to a scorching 33.4°C in August, whereas the lows fluctuate between 20°C to 25.4°C. Despite receiving a high amount of rainfall, particularly in June, the city remains quite humid throughout the season.

Autumn weather in Osaka

Autumn adorns Osaka from September to November with declining temperatures and moderate rainfall. High temperatures drop from 29.3°C in September to 17.6°C by November and lows descent from 21.7°C to 9.9°C. Even though October receives a substantial rainfall of 161mm, the count of rainy days declines.

Winter weather in Osaka

The winter season prevails from December to February in Osaka. While high temperatures decrease from 12.3°C to 9.5°C by February, lows see a dip from 5.1°C to 2.8°C. Despite the cold winds, winter in Osaka witnesses lesser rainfall, dwindling from 44mm in December to 45mm in February. Even snowfall occurs sporadically without significant accumulation.

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. 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. Weather in January »

Weather in February

A minimal uptick in temperatures sees lows hover around 2.9°C, though a chill remains in the air throughout February. Compared to January, the additional 0.8 hours of daily sunshine do little to heat up the chilly city. Sea temperatures steady around the same cold mark as the previous month, still not enticing for aquatic fun. Weather in February »

Weather in March

Moving into March, a notable shift in climate is felt with temperatures warming up to 13.7°C. Longer days are enjoyed with 2.1 additional hours of sunlight, but despite the increased sunshine, rainy days are significantly more frequent. Weather in March »

Weather in April

April ushers in a more pronounced spring feel in Osaka, characterized by much warmer temperatures, which can get as high as 19.9°C. The sea water starts becoming inviting, slowly heating up from March to April. Compared to previous months, humidity perception is fairly constant. Weather in April »

Weather in May

As summer begins to peek over the horizon, May presents higher temperatures in Osaka. The climate continues to become hospitable, but hot days are still limited. The struggle between sporadic showers and radiant sunshine creates a striking balance in the weather pattern. Weather in May »

Weather in June

With summer taking root, June brings hot weather to Osaka, reaching peak temperatures of 27.8°C. While the weather is mostly sunny, levels of humidity increase consistently, making for very humid conditions. Unlike May, June is a month of contrast with increasingly hot days and persistent downpours. Weather in June »

Weather in July

July signifies the height of summer in Osaka, featuring the hottest month of the year with temperatures set to reach as high as 31.6°C. Notably, humidity levels continue to rise, reaching the peak for the year, but frequent showers bring relief from the sweltering summer heat. Weather in July »

Weather in August

Heat continues to dominate the weather in August, with temperatures in Osaka occasionally peaking at 33.4°C. Though the humidity eases a bit from July's high of 70%, the weather remains palpably sticky. Compared to the previous month, rain showers are not as frequent, leading to lower monthly rainfall totals. Weather in August »

Weather in September

In September, a gradual cooling trend sets in from the height of Osaka's summer heat. While the temperature slowly decreases, rainfall exhibits an opposite pattern, resulting in heavier showers compared to the previous month. Weather in September »

Weather in October

With October, the onset of autumn brings significantly cooler weather to Osaka, characterized by temperature highs of only 23.3°C. The shift from summer is also marked by decreased humidity, and the city finds respite from the previous sticky conditions. Weather in October »

Weather in November

November witnesses a further drop in temperatures, characteristic of Osaka's weather transition towards winter. Rainfall decreases significantly compared to October, and the city becomes less damp. Sea temperatures, gradually decreasing from summer, continue their descent, discouraging water activities. Weather in November »

Weather in December

December in Osaka seals the year's end with the coldest temperatures dropping to as low as 5.1°C. Despite the dip in temperatures, moisture remains as a persistent feature with relative humidity hovering around 62%. Though the sun is visible for a shorter duration, bright days are still prevalent, providing scant warmth. Weather in December »


What is the coldest time of year in Osaka?

January brings the lowest temperatures in Osaka, Japan, with an average high of 9.5°C and an average low of 2.8°C.

How much does it rain in Osaka?

Throughout the year, in Osaka, there are 98.1 rainfall days, and 1279mm of precipitation is accumulated.

When does it snow in Osaka?

January and February are months with snowfall.

What is the snowiest month in Osaka?

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

How many days does it snow in Osaka?

Throughout the year, there are 15.5 snowfall days, and 20mm of snow is accumulated.

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.

What are the months with the coldest sea water in Osaka?

February and March, with an average sea temperature of 13.9°C, are months with the coldest seawater.

What are the least humid months in Osaka?

The months with the lowest humidity in Osaka, Japan, are March and April, with an average relative humidity of 59%.

When it does not snow in Osaka?

March through December are months without snowfall in Osaka.

What is the wettest month in Osaka?

June is the month with the most rainfall in Osaka, Japan. Rain falls for 11.2 days and accumulates 185mm of precipitation.

When are the longest days in Osaka?

With an average of 14h and 24min of daylight, June has the longest days of the year in Osaka, Japan.

What is the most humid month in Osaka?

July is the most humid month in Osaka, Japan, with an average relative humidity of 70%.

When is the highest UV index in Osaka?

July is the month with the highest UV index in Osaka, with an average maximum UV index of 11.

What are the warmest months in Osaka?

Osaka's warmest weather arrives in August, when temperatures average a high of 33.4°C and a low of 25.4°C.

When is the sea warmest in Osaka?

August is the month with the warmest seawater, with an average sea temperature of 27.7°C.

What month has the most sunshine in Osaka?

With an average of 7h of sunshine, August has the most sunshine of the year in Osaka, Japan.

What is the driest month in Osaka?

The month with the least rainfall is December, when the rain falls for 5.5 days and typically collects 44mm of precipitation.

What is the month with the shortest days in Osaka?

December has the shortest days of the year in Osaka, Japan, with an average of 9h and 54min of daylight.

Is there Daylight Saving Time (DST) in Osaka?

Osaka does not observe Daylight Saving Time (DST). JST timezone is used throughout the entire year.

When is the lowest UV index in Osaka?

The month with the lowest UV index in Osaka, Japan, is December, with an average maximum UV index of 2.

Average temperature
Osaka, Japan

Average temperature - Osaka, Japan

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).

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).


Average humidity
Osaka, Japan

Average humidity - Osaka, Japan

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


Average rainfall
Osaka, Japan

Average rainfall - Osaka, Japan

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


Average rainfall days
Osaka, Japan

Average rainfall days - Osaka, Japan

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).


Average snowfall
Osaka, Japan

Average snowfall - Osaka, Japan

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).


Average snowfall days
Osaka, Japan

Average snowfall days - Osaka, Japan

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).


Average sea temperature
Osaka, Japan

Average sea temperature - Osaka, Japan

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).


Average daylight / Average sunshine
Osaka, Japan

Average daylight / Average sunshine - Osaka, Japan

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).

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).


Osaka, Japan

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