Karatsu Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Karatsu.
Climate overview of Karatsu
The climate in Karatsu, Saga, Japan, is marked by large temperature swings across the seasons, ranging from 31°C (88°F) in August to 11°C (52°F) in January.
Rainfall is high, totalling around 1825 mm (72 in) per year. June is the wettest month and January the driest. The city also experiences a distinct rainy season from June to September. May is the sunniest month, averaging 6.8 hours of sunshine per day.
Karatsu Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Karatsu — and find the best time to visit.
Monthly Temperature in Karatsu
In Karatsu, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a very warm 31°C (88°F) in August, the warmest time of the year, to a chilly 11°C (52°F) during cooler months like January.
At night, you can expect temperatures ranging from 26°C (79°F) in August to around 5°C (41°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Karatsu
Karatsu experiences significant rainfall throughout the year, averaging 1825 mm (72 in) of precipitation annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, June it receives heavy rainfall, averaging 306 mm (12 in) of precipitation, recorded across 18 rainy days. In contrast, the driest month January brings less rainfall, with 82 mm (3.2 in) over 19 rainy days. For more details, please visit our Karatsu Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Karatsu
Seasonal changes in sunshine hours are quite dramatic in Karatsu. While May receives considerable daily sunshine with up to 6.8 hours, January marks the darkest time of the year, where sunshine is scarce with only 3.4 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Karatsu by Month
The relative humidity is high throughout the year in Karatsu.
The city experiences its highest humidity in July, reaching 76%. In January, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Karatsu
Be prepared for heavier rainfall during June, July, August and September, the wettest period of the year. Need help choosing your next travel destination? We offer a specialized tool that matches you with locations based on your weather preferences. Explore destinations that suit your climate preferences.
Frequently asked questions about the climate in Karatsu
What is the best time to visit Karatsu?
May, October and November typically offer the most optimal weather in Karatsu. In contrast, June and July tend to have less optimal conditions. Karatsu has a distinct rainy season from June to September.
What temperatures can I expect in Karatsu?
Daytime highs range from 11°C (52°F) in January to 31°C (88°F) in August. Nighttime lows range from 5°C (41°F) to 26°C (79°F). Temperatures vary considerably through the year.
How much rain does Karatsu get?
Annual rainfall is around 1825 mm (72 in). June is the wettest month with 306 mm (12 in), while January is the driest with 82 mm (3.2 in).
How sunny is Karatsu?
Karatsu receives around 1,894 hours of sunshine per year. May is the sunniest month with 205 hours, while January is the cloudiest with just 103 hours.
Karatsu 3-Day Forecast
Karatsu 3-Day Forecast
Karatsu on the map
Karatsu is highlighted — select any city to see its climate.
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