September Weather in Haicheng China

Daily high temperatures decrease by 10°F, from 80°F to 69°F, rarely falling below 60°F or exceeding 85°F.

Daily low temperatures decrease by 12°F, from 62°F to 50°F, rarely falling below 41°F or exceeding 69°F.

For reference, on July 26, the hottest day of the year, temperatures in Haicheng typically range from 71°F to 85°F, while on January 17, the coldest day of the year, they range from 4°F to 24°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.

Pocahontas, United States (6,215 miles away) is the far-away foreign place with temperatures most similar to Haicheng (view comparison).

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The month of September in Haicheng experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 34% to 29%.

The clearest day of the month is September 23, with clear, mostly clear, or partly cloudy conditions 71% of the time.

For reference, on July 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on January 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Haicheng, the chance of a wet day over the course of September is rapidly decreasing, starting the month at 24% and ending it at 17%.

For reference, the year's highest daily chance of a wet day is 39% on July 22, and its lowest chance is 1% on January 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 Haicheng is rapidly decreasing, starting the month at 3.3 inches, when it rarely exceeds 6.1 inches or falls below 1.3 inches, and ending the month at 1.6 inches, when it rarely exceeds 3.0 inches or falls below 0.5 inches.

Over the course of September in Haicheng, 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, 17 minutes, implying an average daily decrease of 2 minutes, 40 seconds, and weekly decrease of 18 minutes, 40 seconds.

The shortest day of the month is September 30, with 11 hours, 48 minutes of daylight and the longest day is September 1, with 13 hours, 5 minutes of daylight.

The earliest sunrise of the month in Haicheng is 5:15 AM on September 1 and the latest sunrise is 29 minutes later at 5:44 AM on September 30.

The latest sunset is 6:21 PM on September 1 and the earliest sunset is 49 minutes earlier at 5:32 PM on September 30.

Daylight saving time is not observed in Haicheng during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 4:17 AM and sets 15 hours, 7 minutes later, at 7:23 PM, while on December 21, the shortest day of the year, it rises at 7:09 AM and sets 9 hours, 14 minutes later, at 4:24 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 Haicheng is very rapidly decreasing during September, falling from 34% to 1% over the course of the month.

For reference, on July 29, the muggiest day of the year, there are muggy conditions 88% of the time, while on October 31, 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 Haicheng is increasing during September, increasing from 7.7 miles per hour to 9.1 miles per hour over the course of the month.

For reference, on April 14, the windiest day of the year, the daily average wind speed is 12.4 miles per hour, while on August 26, the calmest day of the year, the daily average wind speed is 7.6 miles per hour.

The hourly average wind direction in Haicheng throughout September is predominantly from the south, with a peak proportion of 41% on September 24.

Haicheng 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 Haicheng is rapidly decreasing during September, falling by 9°F, from 75°F to 66°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 Haicheng typically lasts for 6.4 months (195 days), from around April 8 to around October 20, rarely starting before March 24 or after April 23, and rarely ending before October 4 or after November 4.

The month of September in Haicheng is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 94% over the course of the month.

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 Haicheng are increasing during September, increasing by 443°F, from 2,862°F to 3,305°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 Haicheng is gradually decreasing during September, falling by 0.9 kWh, from 5.2 kWh to 4.3 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Haicheng are 40.852 deg latitude, 122.748 deg longitude, and 108 ft elevation.

The topography within 2 miles of Haicheng contains only modest variations in elevation, with a maximum elevation change of 246 feet and an average elevation above sea level of 99 feet. Within 10 miles contains only modest variations in elevation (1,188 feet). Within 50 miles contains very significant variations in elevation (4,259 feet).

The area within 2 miles of Haicheng is covered by artificial surfaces (75%) and cropland (16%), within 10 miles by cropland (56%) and trees (20%), and within 50 miles by trees (38%) and cropland (36%).