Nagasaki Weather in December

December in Nagasaki brings moderate temperatures around 14°C (57°F) during the day, dropping to 9°C (48°F) at night, with quite a bit of rainfall expected, averaging around 101 mm (4 in) for the month.

Rainfall in Nagasaki in December

Past climate data indicates that roughly 20 days will see rain, totalling around 101 mm (4 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Nagasaki in December

December in Nagasaki sees highs of 14°C (57°F) and lows of 9°C (48°F) overnight. During December, the winter season is in full swing. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows around 9°C (48°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in Nagasaki in December

You can expect a moderate amount of sunlight, with approximately 114 hours. This means a pleasant mix of sun and overcast.

Wind Speed in Nagasaki in December

Wind speeds average 2 m/s (4 knots) during December. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.

Average water temperature in December

At 18°C (64°F), the water is getting there — comfortable enough for most swimmers, though those used to warmer seas may still find it a touch cool.

If you prefer enjoying temperate temperatures and rain-free days, October typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Japan, check out our Nagasaki's climate page.

Nagasaki Temperature in December

Min Temperature 9°C (48°F)  

Max Temperature 14°C (57°F)  

Water Temperature 18°C (64°F)  

Chance of Rain 65%  

Precipitation 101 mm (4 in)  

Rainy days 20 days  

Humidity 67%  

Windspeed 2 m/s (4 knots)  

Sunshine 114 hours  

Percentage Sunshine 34%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Nagasaki typically drop from around 14°C (57°F) at the start of December to approximately 11°C (52°F) by the end. Nights are cold, with lows typically ranging from 4°C (39°F) to 7°C (45°F).

Average temperatures in December

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in December

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Historical weather for Nagasaki in December

Browse day-by-day weather records for Nagasaki spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Nagasaki historical weather extremes in December

Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Nagasaki.

• The warmest day in December was on December 4, 2018, with a maximum of 23°C (73°F).
• The lowest daytime temperature in December was 1°C (34°F), recorded on December 27, 1976.
• The lowest overnight temperature recorded in December was -5°C (23°F) (December 13, 1991).

What to Wear in Nagasaki in December

The weather can swing between comfortable and chilly in December, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. With water temperatures around 18°C (64°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Nagasaki in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

5/10

Walking

5/10

Camping

3/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Nagasaki's climate page.

More climate data for Nagasaki

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Nagasaki climate overview or explore weather in Japan.