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Climate in Saga Prefecture
(Japan)

Average daytime and nighttime temperatures


All climatic diagrams on this site result from the collected data from 2 measuring stations in Saga Prefecture.
All data correspond to the average monthly values of the last 20 years.


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Saga Prefecture is one of the warmest region in Japan with an average daily high temperature of 21 degrees centigrade. The climate is almost moderate, but also offers a few sultry months with high humidity and high temperatures. In 6 months the average temperatures are over 25 degrees. Pleasant water temperatures of up to 27 degrees even invite you to take a bath in the warm season. Due to the warmer temperatures the best time for traveling is from July to September. Nearly unattractive for tourists are the cold months from November to March.
Overview: Climate in Japan
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Hours of sunshine per daySunshine hours per day in Saga Prefecture
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 7 hours per day, August is the sunniest month in the prefecture of Saga Prefecture. In December the sun shines the shortest.
Rainy days per monthRainy days per month in Saga Prefecture
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 13 rainy days, June offers the most number of rainy days, and in October the least.
Precipitation in mm/dayPrecipitation in Saga Prefecture
The amount of precipitation is measured in millimeters per square meter. Thus, at 2 mm/day, 2 liters of water fall on one square meter within 24 hours. With only 2.1 mm, the least rain falls in January. July, on the other hand, has the most rain.
Water temperatureWater temperatures in Saga Prefecture
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest temperatures in Saga Prefecture are in August, when the water is 27 °C.
Relative humidity in %Relative humidity in Saga Prefecture
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With humidity averaging 79%, July is the most uncomfortable. In March, on the other hand, it is easier to endure.
Absolute humidity in g/m³Absolute humidity in Saga Prefecture
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is reached in 4 months in Saga Prefecture, although these are average values, and a month is rarely completely or not at all considered humid.
Humidex in °CHumidex in Saga Prefecture
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of Saga Prefecture

Most important cities in Saga Prefecture


CityPopulationGeo-Position
Saga236,37233° 14' 58"N130° 17' 56"E
Karatsu78,33033° 26' 33"N129° 58' 11"E
Tosu63,59533° 22' 0"N130° 31' 0"E
Imaricho-ko57,94033° 16' 25"N129° 52' 44"E
Okawa39,22333° 12' 0"N130° 20' 60"E
Takeocho-takeo34,23033° 11' 24"N130° 1' 15"E
Kashima32,41033° 6' 22"N130° 5' 26"E
Kanzakimachi-kanzaki20,17233° 18' 32"N130° 22' 26"E
Ureshinomachi-shimojuku18,95333° 6' 49"N130° 0' 11"E


Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants: geonames.org, United Nations Statistics Division and own research.
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