September Weather in Ryūō Japan

Daily high temperatures decrease by 10°F, from 84°F to 74°F, rarely falling below 67°F or exceeding 90°F.

Daily low temperatures decrease by 10°F, from 69°F to 60°F, rarely falling below 54°F or exceeding 74°F.

For reference, on August 6, the hottest day of the year, temperatures in Ryūō typically range from 72°F to 88°F, while on January 22, the coldest day of the year, they range from 27°F to 44°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.

Wattsville, United States (6,914 miles away) is the far-away foreign place with temperatures most similar to Ryūō (view comparison).

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The month of September in Ryūō experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 56% to 52%.

The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 48% of the time.

For reference, on July 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 75%, while on December 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ryūō, the chance of a wet day over the course of September is decreasing, starting the month at 41% and ending it at 35%.

For reference, the year's highest daily chance of a wet day is 51% on July 2, and its lowest chance is 11% on December 27.

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 in Ryūō is essentially constant, remaining about 6.6 inches throughout, and rarely exceeding 12.0 inches or falling below 2.3 inches.

The highest average 31-day accumulation is 6.9 inches on September 16.

Over the course of September in Ryūō, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 4 minutes, implying an average daily decrease of 2 minutes, 13 seconds, and weekly decrease of 15 minutes, 29 seconds.

The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 55 minutes of daylight.

The earliest sunrise of the month in Ryūō is 5:18 AM on September 1 and the latest sunrise is 22 minutes later at 5:40 AM on September 30.

The latest sunset is 6:13 PM on September 1 and the earliest sunset is 42 minutes earlier at 5:31 PM on September 30.

Daylight saving time is not observed in Ryūō during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 4:30 AM and sets 14 hours, 34 minutes later, at 7:04 PM, while on December 21, the shortest day of the year, it rises at 6:51 AM and sets 9 hours, 45 minutes later, at 4:36 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 in Ryūō is very rapidly decreasing during September, falling from 54% to 7% over the course of the month.

For reference, on August 6, the muggiest day of the year, there are muggy conditions 81% of the time, while on November 9, the least muggy day of the year, there are muggy conditions 0% 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 in Ryūō is essentially constant during September, remaining within 0.1 miles per hour of 4.6 miles per hour throughout.

For reference, on February 6, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.

The wind direction in Ryūō during September is predominantly out of the south from September 1 to September 26 and the north from September 26 to September 30.

Ryūō 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 in Ryūō is decreasing during September, falling by 4°F, from 79°F to 75°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).

The growing season in Ryūō typically lasts for 8.3 months (251 days), from around March 26 to around December 3, rarely starting before March 11 or after April 10, and rarely ending before November 16 or after December 19.

The month of September in Ryūō is reliably fully within the growing season.

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 in Ryūō are rapidly increasing during September, increasing by 621°F, from 3,013°F to 3,634°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 in Ryūō is decreasing during September, falling by 1.1 kWh, from 5.2 kWh to 4.1 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Ryūō are 35.650 deg latitude, 138.500 deg longitude, and 945 ft elevation.

The topography within 2 miles of Ryūō contains only modest variations in elevation, with a maximum elevation change of 305 feet and an average elevation above sea level of 970 feet. Within 10 miles contains only modest variations in elevation (7,520 feet). Within 50 miles also contains extreme variations in elevation (12,329 feet).

The area within 2 miles of Ryūō is covered by cropland (66%), trees (14%), and grassland (11%), within 10 miles by trees (64%) and cropland (30%), and within 50 miles by trees (80%) and cropland (11%).