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Climate in Ishigaki (Southern Islands)


Average weather, temperature, rainfall, sunshine hours

Flag - Japan

Ishigaki, where it is located


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Climate chart - Ishigaki
The climate of Ishigaki is sub-tropical, with very mild winters and long, moist and rainy summers.
Ishigaki is the most important of the Yaeyama Islands, an archipelago belonging to the southern Ryukyu islands, which is located to the east of Taiwan, and administratively is part of Okinawa prefecture. Other islands of the Yaeyama archipelago are Iriomote, Taketomijima, Kohamajima, Hatoma, Yubujima, Hateruma (the southernmost inhabited island of Japan), and Yonaguni (the westernmost one). The latitude of these islands is very low, just north of the Tropic of Cancer. Close to the islands is a coral reef.

Although the winter is very mild, the sky is often cloudy, and periods of bad weather, with wind and rain, are quite common. Sometimes, especially in January, there may be very cool days, with highs around 16 °C (61 °F) or less and lows around 10 °C (50 °F). In January 2016, there was a day with a minimum of 8 °C (46 °F) and a maximum of 10 °C (50 °F).
The long summer is muggy, with fairly frequent and sometimes abundant rains. The first part of the rainy season, called the plum rains (Baiu), arrives in May and June, ie one month earlier than on the main islands of Japan, however, between one shower and another, the sun can come out, especially in June. In July, there is a relative pause, so that the rains decrease, and sunshine becomes pretty frequent.

In the second part of summer (August, September, and early October), the rains increase again, but the amount of sunshine remains generally decent, at least until September. If all goes well, a week can pass without rain, otherwise, there may be periods of bad weather, or even typhoons.
In fact, from June to October, with a peak from August to early October, Ishigaki can be affected by typhoons, the tropical cyclones of Southeast Asia, which can bring strong winds and heavy rains.

Kabira Bay

The sea in Ishigaki is never cold, in fact, the temperature drops to a minimum of 23 °C (73 °F) in February, so it's possible to try to swim even in winter, while it gets very warm in summer.

Best Time



It is difficult to find the best time to visit Ishigaki, because there is no dry and sunny period. However, in general you can choose the period from November to April. A typhoon can still pass until mid-November, although this happens rarely and with generally modest effects. From mid-December to mid-March, there can be cool days, with highs of 15 °C (59 °F) or less.
Since there is a pause between the two rainy periods (May-June and August-September), in Ishigaki the best month for a beach holiday is July, though afternoon thunderstorms are still possible, in addition to the passage of tropical storms and typhoons over the island.

Ishigaki - Climate data


In Ishigaki, the average temperature of the coldest month (January) is of 18.8 °C, that of the warmest month (July) is of 29.8 °C. Here are the average temperatures.
Ishigaki - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January16.321.418.8
February16.721.919.3
March18.223.620.9
April20.825.923.4
May23.628.626.1
June26.330.928.6
July27.332.229.8
August26.83229.4
September25.63128.2
October23.528.826.1
November21.126.123.6
December1822.920.4
Year2227.124.5

Precipitation amounts to 2105 millimeters per year: it is therefore abundant. It ranges from 125 millimeters in the driest month (December) to 260 millimeters in the wettest ones (August, September) Here is the average precipitation.
Ishigaki - Average precipitation
MonthRain (mm)Days
January13018
February14017
March13017
April15515
May20518
June20518
July13016
August26018
September26017
October20416
November15517
December12518
Year2105205

The sea temperature ranges from 23.5 °C in February to 29.5 °C in July. Here are the average sea temperatures.
Ishigaki - Sea temperature
MonthTemperatures (°C)
January24
February23.5
March24
April25
May26.5
June28
July29.5
August29
September28.5
October27.5
November26.5">
December25
Year26.4

There are on average around 1850 sunshine hours per year. Here are the average hours of sunshine per day.
Ishigaki - Sunshine hours
MonthAverageTotal
January2.585
February3.590
March4120
April4.5130
May5.5165
June7215
July8.5260
August7.5235
September6.5190
October5160
November4115
December390
Year5.11850

Ishigaki - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January, the coldest month of the year, is generally a warm month. The average temperature is of 18.8 °C, with a minimum of 16.3 °C and a maximum of 21.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 12 °C. However, it dropped to 8 °C in January 2016.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 25.5 °C. However, it reached 27.3 °C in January 1995.
Rain iconPrecipitation amounts to 130 mm, distributed over 18 days.
The day lasts on average 10 hours and 50 minutes.
Sun iconThere are on average 2.5 hours of sunshine per day. So, the sun shines 25% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is of 18.2 kph.
Sea iconThe average sea temperature is of 23.8 °C. Therefore, the sea is warm enough for swimming.


February is generally a warm month. The average temperature is of 19.3 °C, with a minimum of 16.7 °C and a maximum of 21.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 12.5 °C. However, it dropped to 10 °C in February 1992.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 26.5 °C. However, it reached 28 °C in February 2010.
Rain iconPrecipitation amounts to 140 mm, distributed over 17 days.
The day lasts on average 11 hours and 25 minutes.
Sun iconThere are on average 3.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of 18.1 kph.
Sea iconThe average sea temperature is of 23.4 °C. Therefore, the sea can be considered barely acceptable for swimming.


March is generally a warm month. The average temperature is of 20.9 °C, with a minimum of 18.2 °C and a maximum of 23.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 13.5 °C. However, it dropped to 9.7 °C in March 2005.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27.5 °C. However, it reached 29 °C in March 2019.
Rain iconPrecipitation amounts to 130 mm, distributed over 17 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 32% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is of 17.3 kph.
Sea iconThe average sea temperature is of 23.9 °C. Therefore, the sea is warm enough for swimming.


April is generally a warm to hot, muggy month. The average temperature is of 23.4 °C, with a minimum of 20.8 °C and a maximum of 25.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 16 °C. However, it dropped to 13.4 °C in April 1996.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 29 °C. However, it reached 31 °C in April 2019.
Rain iconPrecipitation amounts to 155.1 mm, distributed over 15 days.
The day lasts on average 12 hours and 50 minutes.
Sun iconThere are on average 4.5 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is of 16.5 kph.
Sea iconThe average sea temperature is of 25 °C. Therefore, the sea is warm enough for swimming.


May is generally a warm to hot, muggy month. The average temperature is of 26.1 °C, with a minimum of 23.6 °C and a maximum of 28.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 20 °C. However, it dropped to 17 °C in May 2013.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 31.5 °C. However, it reached 33 °C in May 2018.
Rain iconPrecipitation amounts to 205 mm, distributed over 18 days.
The day lasts on average 13 hours and 20 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is of 15.4 kph.
Sea iconThe average sea temperature is of 26.6 °C. Therefore, the sea is pleasantly warm and allows long swims.


June is generally a very hot, muggy month. The average temperature is of 28.6 °C, with a minimum of 26.3 °C and a maximum of 30.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 22.5 °C. However, it dropped to 19.5 °C in June 2000.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33 °C. However, it reached 34.6 °C in June 2007.
Rain iconPrecipitation amounts to 205 mm, distributed over 18 days.
The day lasts on average 13 hours and 35 minutes. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 18 kph.
Sea iconThe average sea temperature is of 28.2 °C. Therefore, the sea is pleasantly warm and allows long swims.


July, the hottest month of the year, is generally a very hot, muggy month. The average temperature is of 29.8 °C, with a minimum of 27.3 °C and a maximum of 32.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 25 °C. However, it dropped to 23.8 °C in July 2001.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 34 °C. However, it reached 35.3 °C in July 2006.
Rain iconPrecipitation amounts to 130.4 mm, distributed over 16 days.
The day lasts on average 13 hours and 30 minutes.
Sun iconThere are on average 8.5 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is of 19.2 kph.
Sea iconThe average sea temperature is of 29.3 °C. Therefore, the sea is pleasantly warm and allows long swims.


August is generally a very hot, muggy month. The average temperature is of 29.4 °C, with a minimum of 26.8 °C and a maximum of 32 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 24.5 °C. However, it dropped to 23 °C in August 2018.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 34 °C. However, it reached 35.6 °C in August 2017.
Rain iconPrecipitation amounts to 260 mm, distributed over 18 days.
The day lasts on average 12 hours and 55 minutes.
Sun iconThere are on average 7.5 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is of 18.2 kph.
Sea iconThe average sea temperature is of 29.2 °C. Therefore, the sea is pleasantly warm and allows long swims.


September is generally a very hot, muggy month. The average temperature is of 28.2 °C, with a minimum of 25.6 °C and a maximum of 31 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 23 °C. However, it dropped to 20 °C in September 1997.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33 °C. However, it reached 34.7 °C in September 2017.
Rain iconPrecipitation amounts to 260 mm, distributed over 17 days.
The day lasts on average 12 hours and 20 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is of 18.1 kph.
Sea iconThe average sea temperature is of 28.6 °C. Therefore, the sea is pleasantly warm and allows long swims.


October is generally a warm to hot, muggy month. The average temperature is of 26.1 °C, with a minimum of 23.5 °C and a maximum of 28.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 20.5 °C. However, it dropped to 19 °C in October 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 31.5 °C. However, it reached 32.8 °C in October 2017.
Rain iconPrecipitation amounts to 204.5 mm, distributed over 16 days.
The day lasts on average 11 hours and 35 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of 18.9 kph.
Sea iconThe average sea temperature is of 27.6 °C. Therefore, the sea is pleasantly warm and allows long swims.


November is generally a warm to hot, muggy month. The average temperature is of 23.6 °C, with a minimum of 21.1 °C and a maximum of 26.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 17.5 °C. However, it dropped to 13 °C in November 2013.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 29 °C. However, it reached 30.7 °C in November 2008.
Rain iconPrecipitation amounts to 155 mm, distributed over 17 days.
The day lasts on average 11 hours and 0 minutes.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of 19 kph.
Sea iconThe average sea temperature is of 26.3 °C. Therefore, the sea is pleasantly warm and allows long swims.


December is generally a warm month. The average temperature is of 20.4 °C, with a minimum of 18 °C and a maximum of 22.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 13.5 °C. However, it dropped to 10 °C in December 2020.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27 °C. However, it reached 29.2 °C in December 1996.
Rain iconPrecipitation amounts to 125 mm, distributed over 18 days.
The day lasts on average 10 hours and 40 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
Sun iconThere are on average 3 hours of sunshine per day. So, the sun shines 27% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of 19.1 kph.
Sea iconThe average sea temperature is of 24.8 °C. Therefore, the sea is warm enough for swimming.

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