Warm
Average highs sit around 26°C, giving warm days by monthly-average standards.
September verdict
Onjuku, Japan in September
Weather score53Mixed
Mixed for holiday weather
Average highs sit around 26°C, giving warm days by monthly-average standards. Sunshine averages 4.5h per day, so this is not one of the brighter months. Rainfall averages 213mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
26°C
Rain
213mm
Sun
4.5h
Weather score
53
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 213mm, so showers are a real planning factor.
Limited sun
Sunshine averages 4.5h per day, so this is not one of the brighter months.
Map
Weather map
Compare Onjuku, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September26°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
September213mm average rain
September is wetter than Onjuku's yearly average, so flexible plans matter more.
Driest monthsJanuary to February, July, and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.5 hours average sun
September is below Onjuku's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMay and August
This stretch has the strongest sunshine in the monthly averages.
Weather score
September53 weather score
September scores above Onjuku'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.
