Cool
Average highs are around 9°C, so pack for cooler days.
January verdict
Karatsu, Japan in January
Weather score18Poor
Poor for holiday weather
Average highs are around 9°C, so pack for cooler days. Sunshine averages 3.2h per day, so this is not one of the brighter months. Rainfall averages 77mm, which is relatively low for holiday planning.
January weather
Monthly averages
Temp
9°C
Rain
77mm
Sun
3.2h
Sea
16°C
Weather score
18
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 77mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 3.2h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 16°C, so the water can feel cool.
Map
Weather map
Compare Karatsu, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
January9°C average high
January has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
January77mm average rain
January is one of Karatsu's driest months, making outdoor days easier to plan than in wetter parts of the year.
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
January3.2 hours average sun
January is one of Karatsu's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsMay and August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
January16°C average sea
January is one of the coolest sea months, so the water may feel fresher than in peak months.
Warmest seaJuly to September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
January18 weather score
January is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsAugust to October
These months have the strongest weather score in the monthly averages.
Hotels near Karatsu, Japan
Marriott
Fairfield by Marriott Saga Ureshino OnsenUreshino, Saga, Japan
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Fairfield by Marriott Fukuoka UkihaUkiha, Fukuoka, Japan