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Karatsu Weather and climate
Data source:Meteostat Update date:2025-09
Karatsu year round climate
Spring (March–May): Average 12.4–20.2°C, mild climate, but with relatively high rainfall, especially frequent rainfall from April to May. Common activities: Flower viewing (e.g., plum blossoms, cherry blossoms, depending on actual blooming time), enjoying nature. Recommended clothing: Light jacket, long-sleeved shirt, rain gear.
Summer (June–August): Average 24.1–29.1°C, hot and humid, abundant rainfall, with July being the peak of the rainy season. Common activities: Beach activities (swimming, surfing, be aware of typhoons and other weather conditions), escaping the heat in the mountains. Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
Autumn (September–November): Average 15.1–27°C, comfortable and pleasant climate, reduced rainfall. Common activities: Viewing autumn leaves (depending on actual leaf-changing time), outdoor excursions. Recommended clothing: Light jacket, long-sleeved shirt, the temperature difference between morning and evening is relatively large, it is recommended to bring warm clothing.
Winter (December–February): Average 6.5–8°C, cold climate, less rainfall. Common activities: Hot springs, indoor activities. Recommended clothing: Warm jacket, scarf, gloves, hat.
Karatsu climatological average
Annual average temperature: approx. 17.7°C / Annual rainfall: approx. 2032 mm / Summer humidity: 70%–80% / Rainiest month: July
Karatsu monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
6.5°C
66.4
February
8°C
85.3
March
12.4°C
172.8
April
17°C
196.2
May
20.2°C
211.4
June
24.1°C
278.9
July
28.7°C
377.1
August
29.1°C
335.1
September
27°C
121.8
October
20°C
67.2
November
15.1°C
89.7
December
7.8°C
30.8
Karatsu weather for the next seven days
11/6
Thursday
Sunny
20°C/16.1°C
11/7
Friday
Partly Cloudy
20.6°C/14.9°C
11/8
Saturday
Sunny
20.6°C/14.5°C
11/9
Sunday
Moderate rain
18.3°C/15.9°C
11/10
Monday
Sunny
17.4°C/13.9°C
11/11
Tuesday
Sunny
18.1°C/12.9°C
11/12
Wednesday
Sunny
17.9°C/14.7°C
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