Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
September verdict
Karatsu, Japan in September
Weather score61Good
Good for holiday weather
Average highs sit around 27°C, giving warm days by monthly-average standards. Sunshine averages 5.3h per day, enough for a balanced month. Rainfall averages 197mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
27°C
Rain
197mm
Sun
5.3h
Sea
25°C
Weather score
61
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 197mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.3h 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 Karatsu, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September27°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
September197mm average rain
September sits near Karatsu's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
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
September5.3 hours average sun
September sits close to Karatsu's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay and August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September25°C average sea
September 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
September61 weather score
September is one of Karatsu's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsAugust to October
These months have the strongest weather score in the monthly averages.
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