September Weather at Miyako Airport Japan

Daily high temperatures decrease by 3°F, from 87°F to 84°F, rarely falling below 80°F or exceeding 89°F.

Daily low temperatures decrease by 3°F, from 79°F to 77°F, rarely falling below 74°F or exceeding 81°F.

For reference, on July 14, the hottest day of the year, temperatures at Miyako Airport typically range from 80°F to 88°F, while on January 27, the coldest day of the year, they range from 61°F to 68°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Las Higuerillas, Mexico (7,961 miles away) and Redington Shores, United States (8,358 miles) are the far-away foreign places with temperatures most similar to Miyako Airport (view comparison).

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The month of September at Miyako Airport experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 67% to 49%.

The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 51% of the time.

For reference, on June 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 81%, while on December 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 61%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Miyako Airport, the chance of a wet day over the course of September is essentially constant, remaining around 39% throughout.

For reference, the year's highest daily chance of a wet day is 56% on June 3, and its lowest chance is 23% on December 18.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September at Miyako Airport is decreasing, starting the month at 6.4 inches, when it rarely exceeds 11.8 inches or falls below 1.6 inches, and ending the month at 5.7 inches, when it rarely exceeds 10.5 inches or falls below 1.8 inches.

Over the course of September at Miyako Airport, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 41 minutes, implying an average daily decrease of 1 minute, 25 seconds, and weekly decrease of 9 minutes, 58 seconds.

The shortest day of the month is September 30, with 11 hours, 56 minutes of daylight and the longest day is September 1, with 12 hours, 37 minutes of daylight.

The earliest sunrise of the month at Miyako Airport is 6:19 AM on September 1 and the latest sunrise is 11 minutes later at 6:30 AM on September 30.

The latest sunset is 6:57 PM on September 1 and the earliest sunset is 31 minutes earlier at 6:26 PM on September 30.

Daylight saving time is not observed at Miyako Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:50 AM and sets 13 hours, 41 minutes later, at 7:30 PM, while on December 21, the shortest day of the year, it rises at 7:18 AM and sets 10 hours, 36 minutes later, at 5:54 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for September 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy at Miyako Airport is rapidly decreasing during September, falling from 99% to 88% over the course of the month.

For reference, on July 5, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 12, the least muggy day of the year, there are muggy conditions 8% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Miyako Airport is rapidly increasing during September, increasing from 13.7 miles per hour to 16.1 miles per hour over the course of the month.

For reference, on December 1, the windiest day of the year, the daily average wind speed is 18.6 miles per hour, while on May 21, the calmest day of the year, the daily average wind speed is 12.3 miles per hour.

The hourly average wind direction at Miyako Airport throughout September is predominantly from the east, with a peak proportion of 47% on September 26.

Miyako Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Miyako Airport is gradually decreasing during September, falling by 2°F, from 84°F to 82°F, over the course of the month.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures at Miyako Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Miyako Airport are very rapidly increasing during September, increasing by 911°F, from 5,990°F to 6,901°F, over the course of the month.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy at Miyako Airport is essentially constant during September, remaining within 0.1 kWh of 5.1 kWh throughout.

The highest average daily incident shortwave solar energy during September is 5.2 kWh on September 17.

For the purposes of this report, the geographical coordinates of Miyako Airport are 24.783 deg latitude, 125.295 deg longitude, and 148 ft elevation.

The topography within 2 miles of Miyako Airport contains only modest variations in elevation, with a maximum elevation change of 299 feet and an average elevation above sea level of 115 feet. Within 10 miles also contains only modest variations in elevation (394 feet). Within 50 miles also contains only modest variations in elevation (390 feet).

The area within 2 miles of Miyako Airport is covered by cropland (73%) and water (20%), within 10 miles by water (86%) and cropland (12%), and within 50 miles by water (99%).