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Nagasaki, Japan · Temperate oceanic

Nagasaki in December: go or not?

Tough period. Nagasaki in December only reaches 4.2/10.

📅 Updated August 2026 🛰️ ERA5 · 10 years 📍 32.75°N · 129.88°E
⚡ This month's verdict
Avoid
Nagasaki · December
4.2
6–12°
Temperature
28%
Rain
4h
Sun
🌊 Seaside☀️ Bright🍴 Gastronomy
Photo : Tayawee Supan via Unsplash
The month in detail

What to expect in December

In December, Nagasaki sees 12.0°F during the day with 3.7h of sunshine per day. Expect rain on 28.0% of days — a light raincoat in the bag is recommended.

December ranks 10 out of 12 months in Nagasaki. Compared to November: −11°F daytime, −0.9h of sun per day.

This month's conditions

What it's like in December

UV index
3 · moderate
protect during midday hours
Feels like
dry air
Sea
18°C
cool, invigorating
Daylight
9.9h of daylight
Air quality
good
AQI 30
Compare

Is December the right month?

The best month in Nagasaki is October (7.9/10), 3.7 pts higher than December.

See October →See all 12 months →
Context

Our verdict

Nagasaki, the 2nd city to suffer an atomic bombing on 9 August 1945 (74,000 deaths), keeps a singular history in Japan: the only port open to Europeans (Dutch and Portuguese) during the Edo isolation (1639-1854), Christian influence unique in Japan. October is my favorite month (8.2/10): 64-73°F, 27% rain, ideal temperatures before winter.

Read Gilles' full review →

Book

Plan your trip

Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.

🎟️ Activities & tours · Nagasaki

GetYourGuide selection · free cancellation

See all →
Affiliate link · GetYourGuide
Practical info

What you need to know before you go

Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach trip.

Country · Japan

🗣️LanguageJapanese
💶CurrencyYen japonais (¥)
🚗DrivingLeft-hand
🛡️Safety Safe · 2/5
💰Cost of living Moderate · 3/5

🌡️ Climate

🌍Climate typeTemperate oceanic
📈Climate trend Stable
🔥Hottest monthAugust · 88°F
❄️Coolest monthJanuary · 52°F
🌧️Rainiest month July · 58%

🏖️ Beach trip

📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) Modérée
Location

Where is Nagasaki ?

Global position + regional geographic context.

🌍 World
🔍 Geographic context
Japan
Temperate oceanic climate with a 7.9 → 4.1 gap between best and worst month. 10 years of ERA5 data to choose by project.
32.75°N · 129.88°E
Questions

Frequently asked questions

What is the best time to visit Nagasaki?
October is the best month with 73°F highs, 64°F lows, 5.8h of sunshine and 27.0% rainy days. The months of October & September offer comparable conditions.
How many hours of sunshine does Nagasaki get in October?
Nagasaki averages 5.8 sunshine hours per day in October. It is the sunniest month with a climate score of 7.4/10.
What is the rainiest month in Nagasaki?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Nagasaki in October?
In October, overnight lows reach 64°F, while afternoon highs average 73°F.
Is Nagasaki good in winter?
In winter (December-February), Nagasaki scores 4.0/10 on average — Difficult period — prefer the peak season.. The best month overall remains October with a score of 7.4/10.
When should you avoid Nagasaki?
January is the most difficult month to visit Nagasaki, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Nagasaki in December?
In December, the sea averages 65°F in Nagasaki: cool, invigorating. Swimming is possible but brisk; sensitive swimmers may prefer a wetsuit.
Do you need sun protection in Nagasaki in December?
The average UV index reaches 3 in December in Nagasaki (moderate), with about 9.9h of daylight. Protect during midday hours.