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Why is Japan so humid in summer?

Why is Japan so humid in summer?


Japan is known for its hot and humid summers that can be unbearable for some people. The country’s humid subtropical climate causes high levels of moisture in the air, which leads to a muggy feeling during the summer months. In this article, we will explore the reasons behind Japan’s humidity during summer.

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Geographical location:

Japan’s location near the Pacific Ocean plays a significant role in its humidity levels during summer. The ocean’s warm currents bring moist air to the coast, which causes the humidity to rise. Additionally, Japan’s mountainous terrain also contributes to high humidity levels as the mountains trap moisture in the air.

Monsoon season:

Japan experiences a rainy season, called tsuyu or baiu, which starts in May and lasts until July. This season brings heavy rainfall and high humidity levels, making it extremely uncomfortable for people living in the country. The monsoon season is caused by moist air from the south merging with cooler air from the north.


Japan’s urbanization has also contributed to its high levels of humidity during summer. The concrete and asphalt used in cities retain heat, causing temperatures to rise, and ultimately leading to higher humidity levels. Additionally, the large number of people living and working in cities also contributes to increased humidity levels.


Japan is known for its rice paddies that require large amounts of water to grow. During summer, farmers use irrigation systems to water their fields, which can lead to increased humidity levels in rural areas.

Global warming:

Global warming has also been linked to increased humidity levels worldwide, including Japan. As temperatures continue to rise globally, Japan’s already high levels of humidity will likely increase further.

Air conditioning:

As a way to combat the high humidity levels during summer, many Japanese households and businesses use air conditioning systems. However, these systems can also contribute to increased energy consumption, which can lead to environmental issues.

Health effects:

High levels of humidity can have negative effects on people’s health. In Japan, heatstroke is a common issue during summer, especially among the elderly and children. Additionally, high humidity levels can worsen respiratory issues such as asthma.


Japan’s tourism industry is heavily impacted by its high levels of humidity during summer. Many visitors find it uncomfortable to explore the country’s famous landmarks and attractions during the hot and humid months.


To combat the negative effects of high humidity levels in Japan, there are several solutions that individuals and businesses can implement. These include using natural ventilation methods, such as opening windows, reducing energy consumption by using energy-efficient appliances and implementing green initiatives.


In conclusion, Japan’s humid subtropical climate, geographical location near the Pacific Ocean, monsoon season, urbanization, agricultural practices, global warming, air conditioning usage, health effects and impact on tourism all contribute to its high levels of humidity during summer. While it may be uncomfortable for some people, there are several solutions that can be implemented to reduce the negative effects of humidity in Japan.

Is Japan humid in the summer?

The summer in Japan is typically hot and humid, prompting many locals to seek cooler temperatures near the ocean or in mountainous areas to escape the heat.

How do you survive humidity in Japan?

Wearing a linen shirt, which is referred to as リネン or 麻 in Japanese, can help reduce sweating and minimize odor. Surprisingly, a thin wool shirt or suit is more breathable than a cotton or low-quality polyester suit, keeping you fresher for a longer period, at least till 5 pm.

Does Japan have a lot of humidity?

Although Japan is a relatively small country, it experiences a wide range of climates, from the cooler regions of Hokkaido to the tropical climate of Okinawa. However, one common factor across all these climates is the high level of humidity present.

What month is the most humid in Japan?

Certain months in Japan experience high levels of humidity, while others are more comfortable. March has the lowest humidity at 55.5%, while July is the most humid at 73.9%. Generally, winds in Japan are calm, with March being the windiest month, followed by April and December.

Which country is most humid in summer?

The most humid time of year in the Maldives is during the summer months, so it is recommended to visit between December and April, when the weather is drier and less windy but still hot.

Is Japan more humid than Europe?

Japan experiences higher levels of humidity during summer and lower levels of humidity during winter compared to Europe, due to its proximity to the Pacific Ocean.


Japan’s infrastructure is designed to handle and mitigate the effects of high humidity levels during summer. For example, many buildings are constructed with materials that can absorb moisture, such as wood and bamboo. Additionally, Japanese trains and subway stations are equipped with air conditioning systems that provide relief from the heat and humidity.

Cultural practices:

Japanese culture has also adapted to the high humidity levels during summer. For example, many people carry handkerchiefs or small towels to wipe away sweat and moisture. Additionally, traditional summer clothing such as yukatas are made from breathable materials that allow for air flow and comfort.

Summer festivals:

Despite the discomfort of high humidity levels, summer in Japan is also known for its vibrant festivals and events. Many festivals take place outdoors, so visitors and locals alike must endure the muggy weather while enjoying the festivities.

Climate change adaptation:

As global warming continues to affect Japan’s climate, the government has implemented measures to adapt to the changing environment. These measures include increasing green spaces in urban areas to reduce heat island effects and promoting energy-efficient appliances and buildings.

Importance of water conservation:

Due to the high levels of humidity in Japan during summer, water conservation is crucial. The country relies heavily on its water resources for agricultural practices, so it’s essential to use water efficiently and responsibly.


Overall, Japan’s high humidity levels during summer are a result of various factors, including its geographical location, urbanization, and agricultural practices. While the muggy weather can be uncomfortable for some people, many cultural practices and infrastructure designs have adapted to mitigate the effects. As climate change continues to affect Japan’s climate, it’s crucial for individuals and businesses to implement measures to reduce their impact on the environment while adapting to the changing climate.

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