Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
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
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 361mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.6h per day, enough for a balanced month.
Swimmable
Sea temperatures average 25°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
July29°C average high
July is one of Nagasaki's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
July361mm average rain
July is one of Nagasaki's wettest months, so rain is likely to be a major planning factor.
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
July5.6 hours average sun
July 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
July25°C average sea
July 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
July47 weather score
July sits close to Nagasaki's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsAugust to October
These months have the strongest weather score in the monthly averages.
