Climate and monthly weather forecastIshigaki, Japan
Climate and monthly weather forecast
The climate of Ishigaki
Ishigaki, a scenic city in Japan, rests comfortably within the purview of a trusted classification known as the Köppen climate system. Upon analysis, it becomes evident that the city falls squarely under the Cfa or Humid subtropical category, with a yearlong absence of a distinct dry season. Given its geographical position, Ishigaki experiences a compelling blend of climatic conditions throughout the year.A look at the weather parameters reveals a journey from a low of 18.7°C (65.7°F) in January, rising to a peak of 29.3°C (84.7°F) in July and August, and then descending back to the initial low towards the end of the year. Humidity fluctuates within a narrow range throughout the year, often staying within the high 70s%. One cannot pass over the striking rainfall patterns seen in Ishigaki, with an impressive average rainfall of 217mm (8.54") in August and consistent figures throughout the rest of the year.
The city's sea temperatures offer a warm embrace, ranging from 23°C (73.4°F) at the start of the year and reaching a warm 29°C (84.2°F) mid-year from July to September. Daylight hours extend from 10.6 hours to 13.6 hours while average sunshine hours increase, reaching a peak of 9.8 hours in June before eventually dipping towards the year-end. The UV index hovers moderately between 5 to 7. The winds intensify towards the year-end, peaking with an average speed of 32.9km/h (20.4mph) in December. Overall, the city's meteorological tableau paints a uniform pattern, punctuated only by the notable rainfall figure in August.
The best time to visit Ishigaki
A potential visitor finds delight in the period between May and July. During these months, the temperatures stay between 26.1°C (79°F) to 29.3°C (84.7°F), providing a warm but pleasurable atmosphere. Average rainfall stands at between 108mm (4.25") to 94mm (3.7"), with the likelihood of encountering a rainy day nearly half of each month. With sea temperatures approaching an appealing 29°C (84.2°F) and the highest average number of sunshine hours in June, it is indeed a splendid period to absorb the richness of Ishigaki, Japan.The worst time to visit Ishigaki
Travel plans for Ishigaki, Japan may need reconsideration during the month of August. Notable for its significant average rainfall of 217mm (8.54") along with a fair number of rainy days at 22.1, this period might dismay visitors seeking to explore the city’s outdoor experiences thoroughly. The second highest temperature recognized within the year, touching 29.3°C (84.7°F), combines with the highest humidity levels for an intensely warm and potentially inconvenient excursion period.Spring weather in Ishigaki
Ishigaki's spring season, spanning from March to May, encapsulates a delicate mix of weather patterns. The temperatures gradually rise from 21.9°C (71.4°F) to 26.1°C (79°F) and humidity steadily increases as well, indicating the transition from winter to summer. These months experience average rainfall between 50mm (1.97") and 108mm (4.25"), while sunlight duration elongates with each passing day, offering appreciable opportunities to appreciate the beautiful season in its full bloom.Summer weather in Ishigaki
Summer in Ishigaki, extending from June to August, accompanies soaring temperatures, peaking at 29.3°C (84.7°F) in the final two months. The average rainfall similarly ascends, climaxing at a formidable 217mm (8.54") in August. However, these wet conditions are somewhat tempered by the longest daily sunshine duration in the year, registering at an average of 9.8 hours, coupled with the highest sea temperatures, a warm 29°C (84.2°F).Autumn weather in Ishigaki
Entering the autumn months from September to November, a subtle drop in temperatures comes gradually into play, moving from 28.5°C (83.3°F) to 24.9°C (76.8°F). Simultaneously, the rainfall averages decrease from 138mm (5.43") to 96mm (3.78"), indicating a slight reprieve from the heavy summer showers. The winds, however, take an upward trend in these months, culminating at a respectable speed of 30.1km/h (18.7mph) in November.Winter weather in Ishigaki
Winter witnesses a downward spiral in temperatures in Ishigaki, starting from 21.9°C (71.4°F) in December and reaching its nadir of 18.7°C (65.7°F) in January. Interestingly, rainfall density rises once again to an average of 84mm (3.31") in December. The comparatively modest sea and wind temperatures, along with a drop in sunshine hours, contribute to the overall chill of the winter season here in Ishigaki, Japan.Weather in January
January sees the year's arrival in Ishigaki, Japan, with weather that is relatively cool and wet. Humidity hovers around high levels of 76%. Upholding a consistent breeze, the wind blows at approximately 30.8km/h (19.1mph) while gusts reach speeds of up to 38.9km/h (24.2mph). Weather in January »Weather in February
Shifting from January, February in Ishigaki displays marginally increased temperatures and slightly less rainfall. Notably, during this month, the average visibility tends to improve to around 10km (6.2mi), allowing clearer views of the surrounding landscape. Weather in February »Weather in March
As the calendar flips to March, the weather in Ishigaki keeps up with a steady climb in temperatures, creating a gradually warmer climate. The humidity continues unabated from February, remaining at 78%, marking it as a quite sticky period. Weather in March »Weather in April
April brings about more significant changes in Ishigaki's weather as it marks the transition to warmer climes. Despite an increase in passed months' temperatures, rainfall also climbs to a higher 77mm (3.03") with an increase in relative humidity to 81%. Weather in April »Weather in May
May ushers in a hot environment in Ishigaki, with temperatures nearing one of the year's highs. There is an extensive amount of rainfall during this month, reaching a notably high 108mm (4.25"). The rise in daylight hours to 13.3 hours makes May among the longest lighting periods of the year. Weather in May »Weather in June
June in Ishigaki, Japan, consistently maintains high temperatures along with a high relative humidity of 85%. Despite the soaring temperatures, the rainfall remains relatively consistent from the last month, around 94mm (3.7"), which does not hamper outdoor activities as the area receives the most sunshine hours, averaging 9.8 hours per day. Weather in June »Weather in July
July exhibits peak summertime in Ishigaki. It features the year's highest average low temperature of 28.4°C (83.1°F), which equates to warm nights that seldom deviate from daytime heat. Despite representing the intensity of summer, the area witnesses rainfall that is in balance with previous months. Weather in July »Weather in August
August carries forward the high heat from July while presenting the heaviest rainfall of the year at 217mm (8.54"). The increase in rainfall can lead to an uptick in relative humidity, which stands at 81% for this month. Despite the rain, daylight hours remain high, rounding off at an average of 13 hours. Weather in August »Weather in September
September reveals a subtle transition from the wetter August, while temperatures begin to slightly decline. Wind speeds also increase during this month, reaching an average of 25.1km/h (15.6mph), which can provide some relief from the humidity. Weather in September »Weather in October
October in Ishigaki is characterized by a significant drop in temperatures, signaling the beginning of the cooler season. However, one must note that rainfall remains fairly high at 92mm (3.62") for the month. Although the hours of sunshine begin to decrease, the lengths of daylight hours remain consistently above the 11-hour mark. Weather in October »Weather in November
Upon entering November, Ishigaki experiences a marked shift in weather. The average wind speed climbs to a considerable 29.1km/h (18.1mph). However, temperatures continue to mellow out, providing a cooler climate relative to the sweltering summer months. Weather in November »Weather in December
December brings in a chilly atmosphere in Ishigaki, closing the year with the coldest month. The wind speed reaches its highest average for the year at 32.9km/h (20.4mph), bringing a noticeable chill in the air. Although less sunshine is observed during this time, daylight hours still linger above 10, allowing travelers plenty of daylight for sightseeing. Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Ishigaki, January records the average lowest temperatures, peaking at 20.6°C (69.1°F) and reaching a low of 18.7°C (65.7°F).
January and December, with an average relative humidity of 76%, are the least humid months.
Throughout the year, in Ishigaki, Japan, there are 228 rainfall days, and 1184mm (46.61") of precipitation is accumulated.
January and February, with an average sea temperature of 23°C (73.4°F), are months with the coldest seawater.
January through March and December, with an average maximum UV index of 5, are months with the lowest UV index.
March is the month with the least rainfall in Ishigaki. Rain falls for 16.8 days and accumulates 50mm (1.97") of precipitation.
May through September, with an average maximum UV index of 7, are months with the highest UV index in Ishigaki.
June is the most humid month in Ishigaki, with an average relative humidity of 85%.
The month with the longest days is June, with an average of 13h and 36min of daylight.
June has the most sunshine of the year in Ishigaki, Japan, with an average of 9.8h of sunshine.
July and August mark Ishigaki's peak of temperatures, averaging a high-temperature of 29.3°C (84.7°F).
July through September, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Ishigaki, Japan.
The month with the most rainfall is August, when the rain falls for 22.1 days and typically aggregates up to 217mm (8.54") of precipitation.
December has the shortest days of the year in Ishigaki, with an average of 10h and 42min of daylight.
Ishigaki, Japan, does not utilize Daylight Saving Time (DST). JST timezone is used over the entire year.
December has the least sunshine of the year in Ishigaki, with an average of 4.1h of sunshine.
Average temperature
Ishigaki, Japan
The warmest months (with the highest average high temperature) are July and August (29.3°C).
The month with the lowest average high temperature is January (20.6°C).
The month with the highest average low temperature is July (28.4°C).
The coldest month (with the lowest average low temperature) is January (18.7°C).
Average pressure
Ishigaki, Japan
- Average pressure in January:
1020.3mbar - Average pressure in February:
1018.9mbar - Average pressure in March:
1017.5mbar - Average pressure in April:
1014.4mbar - Average pressure in May:
1010.4mbar - Average pressure in June:
1007.3mbar
- Average pressure in July:
1007.2mbar - Average pressure in August:
1005.6mbar - Average pressure in September:
1008.7mbar - Average pressure in October:
1013mbar - Average pressure in November:
1017mbar - Average pressure in December:
1019.3mbar
The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is August (1005.6mbar).
Average wind speed
Ishigaki, Japan
- Average wind speed in January:
30.8km/h - Average wind speed in February:
28.7km/h - Average wind speed in March:
27km/h - Average wind speed in April:
23.7km/h - Average wind speed in May:
20.4km/h - Average wind speed in June:
22.9km/h
- Average wind speed in July:
24.1km/h - Average wind speed in August:
23.3km/h - Average wind speed in September:
25.1km/h - Average wind speed in October:
30.1km/h - Average wind speed in November:
29.1km/h - Average wind speed in December:
32.9km/h
The windiest month (with the highest average wind speed) is December (32.9km/h).
The calmest month (with the lowest average wind speed) is May (20.4km/h).
Average humidity
Ishigaki, Japan
The month with the highest relative humidity is June (85%).
The months with the lowest relative humidity are January and December (76%).
Average rainfall
Ishigaki, Japan
The wettest month (with the highest rainfall) is August (217mm).
The driest month (with the least rainfall) is March (50mm).
Average rainfall days
Ishigaki, Japan
- Average rainfall days in January:
20.8 days - Average rainfall days in February:
17 days - Average rainfall days in March:
16.8 days - Average rainfall days in April:
16.7 days - Average rainfall days in May:
18 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
17.9 days - Average rainfall days in August:
22.1 days - Average rainfall days in September:
19.3 days - Average rainfall days in October:
20 days - Average rainfall days in November:
21.4 days - Average rainfall days in December:
21.2 days
The month with the highest number of rainy days is August (22.1 days).
The month with the least rainy days is April (16.7 days).
Average sea temperature
Ishigaki, Japan
The best months for swimming (with the highest average sea temperature) are July, August and September (29°C).
The coldest months (with the lowest average sea temperature) are January and February (23°C).
Average daylight / Average sunshine
Ishigaki, Japan
- Average daylight in January:
10h and 48min - Average daylight in February:
11h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 42min - Average daylight in May:
13h and 18min - Average daylight in June:
13h and 36min
- Average daylight in July:
13h and 30min - Average daylight in August:
13h and 0min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 36min - Average daylight in November:
11h and 0min - Average daylight in December:
10h and 42min
The month with the longest days is June (Average daylight: 13h and 36min).
The month with the shortest days is December (Average daylight: 10h and 42min).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
5h and 12min - Average sunshine in March:
5h and 42min - Average sunshine in April:
6h and 12min - Average sunshine in May:
7h and 48min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
8h and 42min - Average sunshine in August:
8h and 18min - Average sunshine in September:
8h and 18min - Average sunshine in October:
6h and 54min - Average sunshine in November:
4h and 48min - Average sunshine in December:
4h and 6min
The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days
Ishigaki, Japan
- Average sunshine days in January:
6.7 days - Average sunshine days in February:
8 days - Average sunshine days in March:
10.2 days - Average sunshine days in April:
10.1 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
10.6 days - Average sunshine days in August:
7.3 days - Average sunshine days in September:
8.2 days - Average sunshine days in October:
7.6 days - Average sunshine days in November:
6.2 days - Average sunshine days in December:
6.3 days
The month with the most sunshine days is June (11.8 days).
The month with the least sunshine days is November (6.2 days).
Average UV index
Ishigaki, Japan
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February, March and December (UV index 5).
Average cloud cover
Ishigaki, Japan
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility
Ishigaki, Japan
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
