Mild
Average highs are around 25°C, so days are mild rather than hot.
Weather Guide
Nagano, Nagano, Japan Average Monthly Weather
Weather score30Poor annual avg
Best months: August, July, September
Across the year, average daytime temperatures are around 13°C, sunshine averages 4.7h per day, and rainfall totals about 1487mm. Sea temperatures average 18°C across the year.
Annual weather
Annual averages
Temp
13°C
Rain
1487mm
Annual total
Sun
4.7h
Sea
18°C
Weather score
30
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 210mm, so showers are a real planning factor.
Limited sun
Sunshine averages 4.8h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 24°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Nagano, Nagano, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July25°C average high
July is one of Nagano'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
July210mm average rain
July is one of Nagano's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to May and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July4.8 hours average sun
July sits close to Nagano's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to May
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
July24°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 24°C in this stretch, so swimming comfort is at its strongest.
Weather score
July47 weather score
July scores above Nagano's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
