January in Nagasaki — workable with trade-offs
Trade-offs · 5.3/10January averages 7°C (44°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 78 mm, so plan one flexible day in three; you still get about 1 days with 6+ hours of sunshine and 10.1 hours of daylight.
It scores 5.3/10 here, 6th of 12 months, against 6.9/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
Flexible dates? October scores 1.6 points higher here — enough to change the trip.
February in Nagasaki — middling scores, decent value
Trade-offs · 5.1/10February averages 7°C (45°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 100 mm, so plan one flexible day in three; you still get about 4 days with 6+ hours of sunshine and 10.8 hours of daylight.
It scores 5.1/10 here, 8th of 12 months, against 6.9/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
Flexible dates? October scores 1.8 points higher here — enough to change the trip.
March in Nagasaki — workable with trade-offs
Trade-offs · 5.2/10Expect 11°C (52°F) in March. A good month for city streets, viewpoints and long meals; leave swimming for another season.
174 mm of rain signals a properly wet month, with only about 13 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5.2/10 on the same scale — 7th of 12 months, versus 6.9/10 for the best month here.
Budget for mid-season pricing, and crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
If your dates are flexible, October is materially better in Nagasaki — 1.7 points higher on the same scale.
April in Nagasaki — middling scores, decent value
Trade-offs · 5.7/10April averages 16°C (60°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
227 mm of rain puts this in monsoon territory — about 18 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 5.7/10 here, 4th of 12 months, against 6.9/10 in the destination's best month.
Figure on mid-season pricing, with crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
May in Nagasaki: mixed conditions, plan around the weather
Trade-offs · 5.9/10Temperatures hover around 19°C (66°F) — the kind of month where neither heat nor cold forces the schedule.
This is the year's wettest stretch at 243 mm, but with about 24 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 5.9/10 on the same scale — 3rd of 12 months, versus 6.9/10 for the best month here.
Expect mid-season pricing, and crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
June in Nagasaki: mixed conditions, plan around the weather
Trade-offs · 5.1/10June averages 23°C (73°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
368 mm of rain puts this in monsoon territory — about 18 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 5.1/10 here, 9th of 12 months, against 6.9/10 in the destination's best month.
Figure on mid-season pricing, with crowds are moderate.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
Flexible dates? October scores 1.8 points higher here — enough to change the trip.
July in Nagasaki: expect compromises
Hardest · 3.6/10July averages 27°C (81°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
338 mm makes this the wettest stretch of the year, though about 24 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.
It scores 3.6/10 here, 11th of 12 months, against 6.9/10 in the destination's best month.
Plan for low-season pricing, with crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Flexible dates? October scores 3.3 points higher here — enough to change the trip.
August in Nagasaki: expect compromises
Hardest · 3.4/10Days in August average 28°C (83°F) and humidity near 83% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 238 mm, but with about 27 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3.4/10 on the same scale — 12th of 12 months, versus 6.9/10 for the best month here.
Expect low-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, October is materially better in Nagasaki — 3.5 points higher on the same scale.
September in Nagasaki: expect compromises
Hardest · 4.2/10At 26°C (78°F) this is comfortable city weather in September, with sightseeing easiest before lunch and after the afternoon peak.
Expect monsoon-level rainfall at 215 mm: only about 18 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 4.2/10 on the same scale — 10th of 12 months, versus 6.9/10 for the best month here.
Budget for low-season pricing, and crowds are light for this destination.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
If your dates are flexible, October is materially better in Nagasaki — 2.7 points higher on the same scale.
October: the best month of the year in Nagasaki
Best window · 6.9/10October averages 19°C (66°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Rainfall runs 95 mm, so plan one flexible day in three; you still get about 12 days with 6+ hours of sunshine and 11.2 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Nagasaki at 6.9/10 — the reference point every other month on this page is measured against.
Figure on peak pricing, with crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack light clothing, a hat and real sun protection, a packable rain layer.
November in Nagasaki — workable with trade-offs
Trade-offs · 5.5/10November averages 15°C (58°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
At 128 mm this is a genuinely wet month: about 4 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 5.5/10 here, 5th of 12 months, against 6.9/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
December in Nagasaki: mixed conditions, plan around the weather
Trade-offs · 6.3/10Expect 8°C (46°F) in December. A good month for city streets, viewpoints and long meals; leave swimming for another season.
Budget for roughly 47 mm of rain this month — a flexible day or two helps — with almost no days with 6+ hours of sunshine and 9.9 hours of daylight to work around it.
That is 6.3/10 on the same scale — 2nd of 12 months, versus 6.9/10 for the best month here.
Budget for peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
