Japan · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Nagasaki are May, October and November, when daytime temperatures are agreeable and rainfall is relatively low.
Nagasaki sees its warmest weather in August, when daytime highs average around 32°C, and its coolest in January (around 11°C).
Annual precipitation totals roughly 1895mm — June is typically the wettest month (~336mm) and January the driest (~63mm).
A distinctly wetter period runs from March to September — worth planning around if you prefer dry days.
August is the sunniest month, with about 207 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 60 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 11° / 4°C | 63mm | 🤔 Fair |
| February | 12° / 5°C | 84mm | 🤔 Fair |
| March | 15° / 8°C | 123mm | 🤔 Fair |
| April | 20° / 12°C | 153mm | 👍 Good |
| May | 24° / 16°C | 161mm | 👍 Good |
| June | 27° / 20°C | 336mm | 🤔 Fair |
| July | 30° / 25°C | 293mm | ⚠️ Challenging |
| August | 32° / 25°C | 218mm | ⚠️ Challenging |
| September | 29° / 22°C | 187mm | 🤔 Fair |
| October | 24° / 17°C | 102mm | 🌟 Great |
| November | 19° / 11°C | 101mm | 👍 Good |
| December | 13° / 6°C | 75mm | 🤔 Fair |
January in Nagasaki is chilly, with average daytime highs around 11°C (51°F) and nighttime lows near 4°C (39°F). Expect roughly 63mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
☀️ About 104 hours of sunshine over the month (~3h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
February in Nagasaki is chilly, with average daytime highs around 12°C (54°F) and nighttime lows near 5°C (40°F). Expect roughly 84mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
☀️ About 122 hours of sunshine over the month (~4h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
March in Nagasaki is mild, with average daytime highs around 15°C (60°F) and nighttime lows near 8°C (46°F). Expect roughly 123mm of precipitation spread over about 10 rainy days, and this is one of the wetter months.
☀️ About 160 hours of sunshine over the month (~5h/day).
🎒 What to pack — light jacket · layers for cool evenings · compact umbrella or rain jacket
April in Nagasaki is pleasantly warm, with average daytime highs around 20°C (68°F) and nighttime lows near 12°C (53°F). Expect roughly 153mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 178 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
May in Nagasaki is pleasantly warm, with average daytime highs around 24°C (75°F) and nighttime lows near 16°C (61°F). Expect roughly 161mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 190 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
June in Nagasaki is warm, with average daytime highs around 27°C (80°F) and nighttime lows near 20°C (68°F). Expect roughly 336mm of precipitation spread over about 13 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 125 hours of sunshine over the month (~4h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
July in Nagasaki is hot, with average daytime highs around 30°C (87°F) and nighttime lows near 25°C (76°F). Expect roughly 293mm of precipitation spread over about 11 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 175 hours of sunshine over the month (~6h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in Nagasaki is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 218mm of precipitation spread over about 10 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 207 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Nagasaki is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 22°C (71°F). Expect roughly 187mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 172 hours of sunshine over the month (~6h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
October in Nagasaki is pleasantly warm, with average daytime highs around 24°C (75°F) and nighttime lows near 17°C (62°F). Expect roughly 102mm of precipitation spread over about 6 rainy days, with a moderate amount of rain.
☀️ About 179 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes
November in Nagasaki is mild, with average daytime highs around 19°C (65°F) and nighttime lows near 11°C (52°F). Expect roughly 101mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 137 hours of sunshine over the month (~5h/day).
🎒 What to pack — light jacket · layers for cool evenings
December in Nagasaki is chilly, with average daytime highs around 13°C (56°F) and nighttime lows near 6°C (43°F). Expect roughly 75mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 114 hours of sunshine over the month (~4h/day).
🎒 What to pack — jacket or coat · long-sleeve layers