Weather in Nagasaki

Weather - Nagasaki

Nagasaki enjoys a mild, humid subtropical climate with warm summers, cool winters and a distinct rainy season. If you’re searching for Nagasaki weather to plan flights or a sightseeing trip, expect pleasant spring and autumn temperatures, a wet and warm June–July, and the best beach conditions from late June through September when sea temperatures peak.

Weather - Nagasaki - January

January in Nagasaki is cool and relatively dry compared with summer: daytime highs average around 10 °C and nights drop to about 6 °C. It’s a good month for city sightseeing, museums and food tours—pack a warm jacket and expect crisp, sometimes breezy days but little beach activity.

Weather - Nagasaki - February

February remains chilly with average highs near 11 °C and lows around 7 °C. Rain is moderate; days gradually lengthen and sunlight increases, making it a quieter time to hunt for cheap flights and enjoy cultural attractions without summer crowds.

Weather - Nagasaki - March

March brings spring warmth—average daytime temperatures climb to about 13–14 °C and early blooms start to appear. Rainfall can increase, but many days are pleasant for walking tours and early cherry blossom viewing in the region.

Weather - Nagasaki - April

April is one of the most comfortable months: average highs near 17–19 °C and mild evenings around 13 °C. Sunny stretches are common, ideal for exploring Nagasaki’s harbors, parks and outdoor markets—a prime shoulder-season window for travel deals and comfortable sightseeing.

Weather - Nagasaki - May

May gets warmer, with daytime highs around 21–23 °C and abundant daylight. Expect occasional heavy showers as humidity rises toward the early-summer wet season; it’s a lovely time for gardens and coastal drives, but carry a waterproof layer.

Weather - Nagasaki - June

June marks the start of the rainy season: temperatures average in the mid-20s (about 24–26 °C) and precipitation increases substantially. If you plan to travel in June, be prepared for frequent rain and higher humidity—still reasonable for indoor attractions, and sea temperatures become comfortable for swimming.

Weather - Nagasaki - July

July is hot and humid with average highs around 27–29 °C and many wet days; humidity is high and summer storms are possible. This is peak warm-weather season—great for beachgoers as the sea warms to the mid-20s °C, but expect busy travel periods and occasional heavy downpours or typhoon influence late in the month.

Weather - Nagasaki - August

August is the hottest month with daytime temperatures often approaching 29–31 °C and very warm nights. Sunshine is plentiful, sea temperatures hit their annual high (around 27 °C), and it’s the best time for swimming and coastal escapes—just stay alert for high humidity and the peak typhoon season risk in late summer.

Weather - Nagasaki - September

September offers a warm but gradually cooling climate: daytime highs remain around 27–28 °C while storms from the tropics can bring heavy rain. It’s a good shoulder month for fewer crowds and warm seas, though keep an eye on weather forecasts during typhoon season.

Weather - Nagasaki - October

October is comfortable and drier, with average highs near 22–23 °C and pleasant evenings. It’s one of the best months for outdoor activities, sightseeing and catching the autumn colors without the summer heat or heavy rains.

Weather - Nagasaki - November

November brings cool, crisp conditions—daytime temperatures drop to the mid-teens (around 17 °C) and rainfall stays moderate. Clear days are common, making this a great month for cultural trips and affordable flight options before winter sets in.

Weather - Nagasaki - December

December turns cooler with highs near 12 °C and lows around 8 °C. It’s typically a dry, bright month for exploring the city’s historical sites—pack a warm layer for evenings and coastal breezes.

Table of temperatures throughout the year