Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
September verdict
Osaka, Osaka, Japan in September
Weather score59Good
Good for holiday weather
Average highs sit around 29°C, giving warm days by monthly-average standards. Sunshine averages 4.7h per day, so this is not one of the brighter months. Rainfall averages 183mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
29°C
Rain
183mm
Sun
4.7h
Sea
26°C
Weather score
59
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 183mm, so showers are a real planning factor.
Limited sun
Sunshine averages 4.7h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 26°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Osaka, Osaka, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September29°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September183mm average rain
September is wetter than Osaka's yearly average, so flexible plans matter more.
Driest monthsJanuary to March and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.7 hours average sun
September is below Osaka'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.
Sea temperature
September26°C average sea
September is one of Osaka's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
September59 weather score
September is one of Osaka's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to October
These months have the strongest weather score in the monthly averages.
