September Weather in Giyani South Africa

Daily high temperatures increase by 3°F, from 80°F to 83°F, rarely falling below 69°F or exceeding 94°F.

Daily low temperatures increase by 5°F, from 56°F to 61°F, rarely falling below 50°F or exceeding 66°F.

For reference, on January 1, the hottest day of the year, temperatures in Giyani typically range from 69°F to 86°F, while on July 7, the coldest day of the year, they range from 50°F to 74°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.

Leme, Brazil (4,915 miles away) is the far-away foreign place with temperatures most similar to Giyani (view comparison).

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The month of September in Giyani experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 8% to 13%.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 92% of the time.

For reference, on December 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on June 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 94%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Giyani, the chance of a wet day over the course of September is increasing, starting the month at 5% and ending it at 10%.

For reference, the year's highest daily chance of a wet day is 44% on December 1, and its lowest chance is 2% on July 7.

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 Giyani is gradually increasing, starting the month at 0.4 inches, when it rarely exceeds 1.5 inches or falls below -0.0 inches, and ending the month at 0.8 inches, when it rarely exceeds 2.0 inches or falls below 0.1 inches.

Over the course of September in Giyani, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 38 minutes, implying an average daily increase of 1 minute, 19 seconds, and weekly increase of 9 minutes, 15 seconds.

The shortest day of the month is September 1, with 11 hours, 39 minutes of daylight and the longest day is September 30, with 12 hours, 18 minutes of daylight.

The latest sunrise of the month in Giyani is 6:07 AM on September 1 and the earliest sunrise is 29 minutes earlier at 5:38 AM on September 30.

The earliest sunset is 5:46 PM on September 1 and the latest sunset is 9 minutes later at 5:56 PM on September 30.

Daylight saving time is not observed in Giyani during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:08 AM and sets 13 hours, 34 minutes later, at 6:42 PM, while on June 20, the shortest day of the year, it rises at 6:37 AM and sets 10 hours, 42 minutes later, at 5:19 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 Giyani is gradually increasing during September, rising from 1% to 3% over the course of the month.

For reference, on January 25, the muggiest day of the year, there are muggy conditions 63% of the time, while on July 5, 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 Giyani is gradually increasing during September, increasing from 8.3 miles per hour to 9.2 miles per hour over the course of the month.

For reference, on October 12, the windiest day of the year, the daily average wind speed is 9.4 miles per hour, while on May 10, the calmest day of the year, the daily average wind speed is 6.4 miles per hour.

The hourly average wind direction in Giyani throughout September is predominantly from the east, with a peak proportion of 60% on September 30.

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 in Giyani 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 in Giyani are rapidly increasing during September, increasing by 575°F, from 846°F to 1,421°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 Giyani is gradually increasing during September, rising by 0.9 kWh, from 5.8 kWh to 6.7 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Giyani are -23.302 deg latitude, 30.719 deg longitude, and 1,588 ft elevation.

The topography within 2 miles of Giyani contains very significant variations in elevation, with a maximum elevation change of 1,299 feet and an average elevation above sea level of 1,617 feet. Within 10 miles also contains very significant variations in elevation (1,427 feet). Within 50 miles contains very significant variations in elevation (4,334 feet).

The area within 2 miles of Giyani is covered by cropland (53%) and artificial surfaces (33%), within 10 miles by cropland (64%) and trees (15%), and within 50 miles by cropland (44%) and shrubs (25%).