Nagasaki Weather in April

April in Nagasaki sees daytime temperatures around 18°C (64°F) and lows of 13°C (55°F) at night. Being part of the rainy season, heavy rainfall is a regular part of the day, so pack accordingly.

Rainfall in Nagasaki in April

Nagasaki is in the rainy season in April, with rain on around 17 days and an average of 175 mm (6.9 in). With rain on many days and solid totals, showers are frequent and often moderately heavy. Waterproof gear is a sensible idea.

Temperature in Nagasaki in April

April in Nagasaki sees highs of 18°C (64°F) and lows of 13°C (55°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 13°C (55°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Nagasaki in April

The area enjoys a balanced 180 hours of sunlight, ensuring it's neither too rainy nor too sunny.

Wind Speed in Nagasaki in April

Wind speeds average 2 m/s (4 knots) during April. 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 April

The water temperature is 17°C (63°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

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 April

Min Temperature 13°C (55°F)  

Max Temperature 18°C (64°F)  

Water Temperature 17°C (63°F)  

Chance of Rain 56%  

Precipitation 175 mm (6.9 in)  

Rainy days 17 days  

Humidity 67%  

Windspeed 2 m/s (4 knots)  

Sunshine 180 hours  

Percentage Sunshine 42%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Nagasaki typically rise from around 18°C (64°F) at the start of April to approximately 21°C (70°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 14°C (57°F).

Average temperatures in April

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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 April

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Historical weather for Nagasaki in April

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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Nagasaki historical weather extremes in April

Based on weather observations in Nagasaki between 1976 and 2026, these are the recorded extremes during April.

• Nagasaki recorded its highest April temperature of 29°C (84°F) on April 29, 1998.
• Nagasaki experienced its chilliest April day on April 2, 1996, reaching only 9°C (48°F).
• The lowest overnight temperature recorded in April was 1°C (34°F) (April 1, 1985).
• The heaviest April precipitation occurred on April 10, 2006, when 94 mm (3.7 in) of precipitation fell.

What to Wear in Nagasaki in April

For Nagasaki in April, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. With water temperatures around 17°C (63°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Nagasaki in April

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

Swimming

6/10

Camping

6/10

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.