Nagasaki Weather: Monthly Temperatures and What to Wear

Nagasaki Weather Features

Located in northwestern Kyushu, Nagasaki generally enjoys a mild climate warmed by East China Sea currents. However, conditions vary significantly by region:

- Northern Region: Experiences strong winter monsoons, creating a colder climate similar to the Sea of Japan coast.

- Inland and Shimabara Peninsula: Prone to extreme shifts, with hot summers, biting winters, and large daily temperature swings.

- Tsushima and Iki Islands: See prolonged, freezing winter temperatures driven by seasonal winds from the Korean Peninsula.

• Table of Contents
• Winter in Nagasaki: Cold-Weather Gear is Essential
• Spring in Nagasaki: Have Light Outerwear and Rain Gear at Hand
• Summer in Nagasaki: Don't Forget Sun Protection
• Autumn in Nagasaki: Choose Clothing That Is Easy to Put On and Take Off
• Enjoy Exploring Nagasaki

Winter in Nagasaki: Cold-Weather Gear is Essential

Photo by Pixta

If you are visiting Nagasaki from January to March, heavy winter gear is essential. Pack a warm coat or down jacket, and don't forget accessories like scarves, gloves, and beanies.

The reward for braving the cold is spectacular: you can take in crisp, crystal-clear night views and experience major winter traditions like the famous Nagasaki Lantern Festival (held around February). Bundle up and enjoy the city at its winter best!

January: Average High 12°C, Average Low 4.9°C

January is Nagasaki’s coldest month, bringing bitter chills—especially in the mornings and evenings. A heavy coat or down jacket is a must.

A key feature of this month is the piercing northwesterly seasonal wind. On windy days, standard winter clothes aren't enough; you will want wind-resistant outerwear alongside a scarf and gloves.

Packing Tip: Stay warm by layering thermal undershirts (like Heattech) and sweaters beneath your jacket, and don't forget thick socks!

February: Average High 14.3°C, Average Low 7.4°C

While February brings occasional daytime sunshine, heavy winter protection is still essential.

The best strategy is to layer up: wear a thick blouson, fleece, or jacket over a knit sweater. Don't forget to pack a scarf and gloves so you can easily adjust your outfit as the temperature changes throughout the day.

March: Average High 16°C, Average Low 8.6°C

March brings the welcome arrival of spring to Nagasaki, making daytime sightseeing relatively comfortable.

For clothing, opt for flexible layers like light jackets or cardigans. While daytime temperatures are pleasant, mornings and evenings remain chilly, so choose pieces that are easy to slip on and take off as the weather shifts.

Spring in Nagasaki: Have Light Outerwear and Rain Gear at Hand

Cherry blossoms near Lake Nodake in Omura, Nagasaki. Photo by Pixta

Nagasaki transitions from spring to early summer between April and June. While daytime temperatures rise comfortably, mornings or cloudy days can still be quite chilly.

June also marks the start of the rainy season, so preparing rain gear—like a compact umbrella or raincoat—is essential. Despite the occasional showers, this is a spectacular season of fresh greenery and blooming flowers.

Pack a few versatile layers and a raincoat to fully enjoy Nagasaki’s stunning nature!

April: Average High 21.6°C, Average Low 14.7°C

April brings good weather in Nagasaki, offering mild, beautiful spring days. Early April is also the peak season for cherry blossoms, offering stunning flower-viewing spots throughout the prefecture.

For clothing, pair long-sleeved shirts or blouses with light outerwear like a cardigan. Just be mindful of "spring storms"—sudden weather shifts that can bring unexpected wind and rain.

May: Average High 24.6°C, Average Low 16°C

May in Nagasaki is a comfortable season filled with vibrant, fresh greenery. While there are more days with warm, sweat-inducing weather during the daytime, you can still catch a refreshing breeze in the mornings and evenings.

For clothing, lightweight shirts or blouses are absolutely perfect.

To protect yourself against UV rays, it is a good idea to pack a hat and sunscreen for peace of mind.

June: Average High 26.7°C, Average Low 20.5°C

June kicks off the rainy season in Nagasaki, bringing frequent downpours and high humidity. When the rain clears, temperatures spike rapidly, so it is vital to stay hydrated to prevent heatstroke.

For clothing, opt for breathable short-sleeved shirts or blouses. To tackle the wet weather, a compact umbrella or a water-repellent outer layer is highly useful.

Lastly, because Nagasaki is famous for its hills, be sure to wear slip-resistant shoes that handle wet asphalt safely.

Summer in Nagasaki: Don't Forget Sun Protection

Nagasaki Minato Festival. Photo by Pixta

July through September is peak summer in Nagasaki, bringing intense heat and strong UV rays. Thorough heatstroke prevention is essential: stay hydrated, use sunscreen, and wear a hat or parasol.

For maximum comfort, wear moisture-wicking, quick-drying clothes, but carry a light jacket to handle blasted indoor air conditioning.

This is the ultimate season for seaside leisure and vibrant fireworks festivals—especially the iconic Nagasaki Minato Matsuri in late July.

July: Average High 31.7°C, Average Low 26.1°C

July in Nagasaki marks the true arrival of summer, bringing rising temperatures. The daytime heat becomes severe.

With the intense sunlight beating down, UV protection is essential. Additionally, since the region can be affected by typhoons, it is important to stay mindful of sudden changes in the weather.

For clothing, breathable T-shirts or items made of moisture-wicking, quick-drying materials are ideal. To protect yourself from the sun, please make good use of hats, sunglasses, and sunscreen as well.

August: Average High 33.8°C, Average Low 26.7°C

August brings Nagasaki's most severe heat of the year. You will face intense, muggy conditions during both the day and night, making heatstroke precautions absolutely vital.

To stay safe while exploring, take frequent breaks in the shade or indoors, and stay constantly hydrated.

Dress in outfits that are as cool as possible, such as sleeveless tops or lightweight short sleeves, and ensure you have thorough sun protection like hats and sunscreen packed for every outing.

September: Average High 32.9°C, Average Low 25.5°C

September stays quite warm in Nagasaki, keeping daytime temperatures high. Crucially, this is also the peak season for typhoons.

Along with the autumn rain front, expect an increased number of rainy days, making a compact umbrella an essential item to carry when going out.

In terms of clothing, choose pieces that let you easily adjust to changing conditions—such as wearing short sleeves but carrying a light long-sleeved shirt or outer layer.

Autumn in Nagasaki: Choose Clothing That Is Easy to Put On and Take Off

Unzen Ropeway in autumn. Photo by Pixta

Nagasaki transitions from autumn to winter between October and December, with a sharp, biting cold arriving by year's end. To stay comfortable, we recommend wearing flexible layers—like long-sleeved shirts or light knits under a removable jacket.

This period is also spectacular for fall foliage.

Be sure to check out the breathtaking autumn colors across the mountains of Unzen, or visit Sasebo’s Jufukuji Temple to see its famous Upside-Down Autumn Leaves, which create a mesmerizing reflection inside the temple hall.

October: Average High 26.6°C, Average Low 19.6°C

October is the ideal time to enjoy Nagasaki’s beautiful, comfortable autumn weather.

Wearing a shirt layered with a cardigan or jacket ensures that you can easily adapt to shifting daily temperatures.

While the weather is generally pleasant, autumn skies can occasionally be unpredictable—carrying a compact folding umbrella will ensure you are prepared for sudden, unexpected showers.

November: Average High 20.3°C, Average Low 13.3°C

As winter approaches in November, Nagasaki sees an increasing number of chilly days, even during the afternoon.

Combine long-sleeved shirts or sweaters with a reliable jacket or coat. Smart layering will ensure you stay perfectly comfortable as temperatures shift throughout your day of sightseeing.

December: Average High 12.5°C, Average Low 5.8°C

December marks the start of Nagasaki's severe winter cold, bringing deep chills in the mornings and evenings.

Because strong, piercing northwesterly seasonal winds sweep through the region, a wind-resistant outer layer is an absolute lifesaver.

We recommend wrapping up in a thick coat or down jacket. Don't forget to protect your extremities from the wind by wearing a warm scarf, gloves, and a beanie during your winter sightseeing.

Glover Garden

8-1 Minamiyamatemachi, Nagasaki City, Nagasaki Prefecture 850-0931

Enjoy Exploring Nagasaki

While Nagasaki generally enjoys a mild climate, packing versatile layers that allow you to easily adjust to the season is the secret to a comfortable trip.

With its rich history and stunning seasonal highlights, Nagasaki is a prefecture waiting to be discovered. Dress comfortably, pack smart, and have an unforgettable time exploring this incredible city!