Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
Weather Guide
Karatsu, Japan Average Monthly Weather
Weather score37Poor annual avg
Best months: September, August, October
Across the year, average daytime temperatures are around 20°C, sunshine averages 4.9h per day, and rainfall totals about 1939mm. Sea temperatures average 20°C across the year.
Annual weather
Annual averages
Temp
20°C
Rain
1939mm
Annual total
Sun
4.9h
Sea
20°C
Weather score
37
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 189mm, so showers are a real planning factor.
Some sun
Sunshine averages 6.6h per day, enough for a balanced month.
Swimmable
Sea temperatures average 27°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
August31°C average high
August is one of Karatsu'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
August189mm average rain
August 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
August6.6 hours average sun
August is one of Karatsu's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay and August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August27°C average sea
August is one of Karatsu'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
August59 weather score
August 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.
Hotels near Karatsu, Japan
Marriott
Fairfield by Marriott Saga Ureshino OnsenUreshino, Saga, Japan
The Ritz-Carlton, FukuokaFukuoka, Japan
Four Points Flex by Sheraton Fukuoka HakataFukuoka, Fukuoka, Japan
Iki Retreat by Onko Chishin, a Member of Design Hotels™Iki, Nagasaki, Japan
Nagasaki Marriott HotelNagasaki, Nagasaki, Japan
Fairfield by Marriott Fukuoka UkihaUkiha, Fukuoka, Japan