Karatsu Castle is a seaside castle, so it's not crowded and there are relatively few people. The scenery is beautiful!
Anonymous User
Family
Karatsu Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Karatsu year round climate
Spring (March–May): Average 54–68°F, 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 75–84°F, 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 59–80°F, 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 43–46°F, cold climate, less rainfall. Common activities: Hot springs, indoor activities. Recommended clothing: Warm jacket, scarf, gloves, hat.
Karatsu climatological average
Annual average temperature: approx. 63.9°F / Annual rainfall: approx. 2032 mm / Summer humidity: 70%–80% / Rainiest month: July
Karatsu monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
43.7°F
66.4
February
46.4°F
85.3
March
54.3°F
172.8
April
62.6°F
196.2
May
68.4°F
211.4
June
75.4°F
278.9
July
83.7°F
377.1
August
84.4°F
335.1
September
80.6°F
121.8
October
68°F
67.2
November
59.2°F
89.7
December
46°F
30.8
Karatsu weather for the next seven days
2/3
Tuesday
Sunny
46.5°F/37.9°F
2/4
Wednesday
Overcast
53.6°F/41.4°F
2/5
Thursday
Patchy rain nearby
57.7°F/45.7°F
2/6
Friday
Patchy rain nearby
54.9°F/46.4°F
2/7
Saturday
Sunny
44.7°F/39.2°F
2/8
Sunday
Patchy rain nearby
35.3°F/34.3°F
2/9
Monday
Sunny
43°F/34.2°F
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