Nagasaki in January: weather, what to wear and what's on

Averages for 1991–2020 at the JMA's Nagasaki station (27 m above sea level).

High

10.7°C (51°F)

Low

4.0°C (39°F)

Precipitation

63.1 mm

Wet days

9.0 days

Sunshine

104 hours

Snow on ground

1.0 days

• Highs are 2.4°C below December and 1.3°C below February.
• That is 10.5°C below Nagasaki's yearly average high of 21.2°C.
• Of our 34 places with temperature records, Nagasaki is the 7th warmest in January: level with Kumamoto and 0.5°C warmer than Fukuoka.
• Of our 35 places, Nagasaki has the 17th lowest precipitation in January: 0.2 mm less than Ise and 2.2 mm more than Kawaguchiko.
• Rain or snow of 1 mm or more falls on 9.0 days, and 10 mm or more on 1.9 days.
• The temperature drops below 0°C on 1.6 nights.
• 3 cm of snow falls in an average January; snow lies on the ground on 1.0 days.
• The sun is out for 40% or more of the possible hours on 11.7 days, and 4.5 days have under 0.1 hours of sunshine.
• On 15 January 2027 the sun rises at 7:23 and sets at 17:37 in Nagasaki, giving 10 hours 14 minutes of daylight (NAOJ).

Average temperature

7.2°C (45°F)

Humidity

66%

Deepest snow (average of each year's deepest)

2 cm

Early, mid and late January

By the last ten days of January the average high in Nagasaki is 0.9°C lower than in the first ten.

By ten-day totals, 21–31 January is the wettest (23.9 mm) and 1–10 January the driest (16.8 mm).

Is Nagasaki cold in January?

Yes, it is chilly. Nagasaki averages 10.7°C (51°F) by day and 4.0°C (39°F) at night in January. 21–31 January is the coldest stretch of the year, with highs of 10.3°C.

Chilly: highs around 10.7°C

• A warm jacket or light coat over a sweater.
• Gloves and a hat for mornings and nights: the temperature drops below 0°C on 1.6 nights.
• A folding umbrella: rain or snow falls on 9.0 days.

Shoes

• Shoes with good grip: snow or sleet falls on 7.0 days.

Pack

• Folding umbrella
• Gloves and a warm hat

• Our clothing rules

Plum blossom

The JMA's sample plum tree in Nagasaki opens around 24 January in an average year (1991–2020). In 2026: 15 January.

Dates are for one sample tree at or near the JMA observatory, not for every park in the city.

National holidays in January 2027:

• Fri 1 January — New Year's Day
• Mon 11 January — Coming of Age Day

• Fri 1 January to Sun 3 January: 3 days off in a row
• Sat 9 January to Mon 11 January: 3 days off in a row

In January 2025, hotels and inns across Nagasaki Prefecture were 46.0% full on average (the quietest month of the year). Foreign guests spent 60,900 nights there that month (Japan Tourism Agency). That compares with 59.9% in December and 57.0% in February.

• Japan in January: visitor numbers and busy travel days
• Holidays in January
• Year-end and New Year holidays