Mild
Average highs are around 23°C, so days are mild rather than hot.
Weather Guide
Nagasaki, Nagasaki, Japan Average Monthly Weather
Weather score37Poor annual avg
Best months: September, August, October
Across the year, average daytime temperatures are around 20°C, sunshine averages 4.9h per day, and rainfall totals about 2124mm. Sea temperatures average 21°C across the year.
Annual weather
Annual averages
Temp
20°C
Rain
2124mm
Annual total
Sun
4.9h
Sea
21°C
Weather score
37
Poor avg
Seasonal climate calendar
Trip feel
Showers
Rainfall averages 103mm, so some wet days are possible.
Some sun
Sunshine averages 5.6h per day, enough for a balanced month.
Swimmable
Sea temperatures average 24°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Nagasaki, Nagasaki, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
October23°C average high
October is close to Nagasaki's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
October103mm average rain
October sits on the drier side of Nagasaki's year, which helps with sightseeing and transfers.
Driest monthsJanuary to March and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
October5.6 hours average sun
October sits close to Nagasaki's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay and July to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
October24°C average sea
October sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
October56 weather score
October scores above Nagasaki's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsAugust to October
These months have the strongest weather score in the monthly averages.
