Nagasaki weather by month & the best time to visit
Japan · coastal city break · humid subtropical climate
The best time to visit Nagasaki is October — its sunniest month (Sunshine Score 67/100), with May and June close behind. Nagasaki averages about 1,779 hours of sunshine a year. Daytime highs around 23°C / 73°F and roughly 117 mm of rain in October.
When is the best time to visit Nagasaki?
For sunshine, the best time to visit Nagasaki is October, then May and June. The dullest month is January (13/100, 71 mm of rain). The full month-by-month picture is in the table below.
How sunny is Nagasaki?
Nagasaki isn't a sunny place by world standards: about 1,779 hours of sunshine a year. 54 Sunshine Score points separate October (67) from January (13), so the month you pick matters. It ranks #39 of 79 destinations in Japan for annual sunshine, above the national median of 1,773 hours. Rain has a clear season: the wettest stretch, around July, carries about 44% of the annual 2,077 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 13 | 10° / 50°F | 3° / 37°F | 71 mm | 2 | 15° / 59°F |
| February | 24 | 12° / 54°F | 4° / 39°F | 99 mm | 3 | 16° / 61°F |
| March | 38 | 15° / 59°F | 6° / 43°F | 131 mm | 5 | 16° / 61°F |
| April | 56 | 19° / 66°F | 10° / 50°F | 167 mm | 6 | 18° / 64°F |
| May | 61 | 24° / 75°F | 15° / 59°F | 186 mm | 6 | 20° / 68°F |
| June | 61 | 27° / 81°F | 19° / 66°F | 333 mm | 6 | 24° / 75°F |
| July | 61 | 30° / 86°F | 24° / 75°F | 352 mm | 8 | 28° / 82°F |
| August | 61 | 31° / 88°F | 24° / 75°F | 225 mm | 8 | 30° / 86°F |
| September | 61 | 28° / 82°F | 21° / 70°F | 201 mm | 7 | 29° / 84°F |
| October | 67 | 23° / 73°F | 16° / 61°F | 117 mm | 5 | 26° / 79°F |
| November | 53 | 17° / 63°F | 11° / 52°F | 103 mm | 3 | 23° / 73°F |
| December | 24 | 12° / 54°F | 6° / 43°F | 92 mm | 2 | 18° / 64°F |
Sea temperature in Nagasaki by month
The sea off Nagasaki is warmest in August at around 30°C / 86°F, and coolest in January at 15°C / 59°F. The water sits at a comfortable 21°C or warmer roughly 6 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
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Nagasaki: questions and answers
What kind of destination is Nagasaki?
Nagasaki is a coastal city break in Japan with a humid subtropical climate — the sea reaches 30°C at its warmest and is swimmable (21°C+) about 6 months a year.
How many hours of sunshine does Nagasaki get a year?
Nagasaki gets about 1,779 hours of sunshine a year, at its best around October.
When is the best time to visit Nagasaki?
The sunniest time to visit Nagasaki is October, when the Sunshine Score peaks at 67/100 (with May and June close behind). Expect daytime highs around 23°C / 73°F.
What is the least sunny month in Nagasaki?
January is the least sunny month in Nagasaki, scoring 13/100 with about 71 mm of rain.
What is the sea temperature in Nagasaki?
The sea in Nagasaki ranges from about 15°C (January) to 30°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Nagasaki?
The typical midday UV index in Nagasaki peaks around 8 (very high) in July, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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