September Weather in Orange California, United States

Daily high temperatures decrease by 3°F, from 84°F to 81°F, rarely falling below 72°F or exceeding 93°F.

Daily low temperatures decrease by 4°F, from 64°F to 60°F, rarely falling below 55°F or exceeding 70°F.

For reference, on August 23, the hottest day of the year, temperatures in Orange typically range from 65°F to 85°F, while on December 26, the coldest day of the year, they range from 45°F to 67°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.

Uitenhage, Eastern Cape, South Africa (10,349 miles away) and Perth, Western Australia, Australia (9,363 miles) are the far-away foreign places with temperatures most similar to Orange (view comparison).

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The month of September in Orange experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 11% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 9% on September 6.

The clearest day of the month is September 6, with clear, mostly clear, or partly cloudy conditions 91% of the time.

For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on September 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Orange, the chance of a wet day over the course of September is gradually increasing, starting the month at 1% and ending it at 3%.

For reference, the year's highest daily chance of a wet day is 20% on February 20, and its lowest chance is 0% on June 22.

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 Orange is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches or falling below -0.0 inches.

Over the course of September in Orange, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 0 minutes, implying an average daily decrease of 2 minutes, 4 seconds, and weekly decrease of 14 minutes, 27 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, 50 minutes of daylight.

The earliest sunrise of the month in Orange is 6:25 AM on September 1 and the latest sunrise is 20 minutes later at 6:45 AM on September 30.

The latest sunset is 7:16 PM on September 1 and the earliest sunset is 40 minutes earlier at 6:36 PM on September 30.

Daylight saving time is observed in Orange during 2024, but it neither starts nor ends during September, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:41 AM and sets 14 hours, 24 minutes later, at 8:05 PM, while on December 21, the shortest day of the year, it rises at 6:52 AM and sets 9 hours, 54 minutes later, at 4:47 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 Orange is decreasing during September, falling from 10% to 4% over the course of the month.

For reference, on August 27, the muggiest day of the year, there are muggy conditions 10% of the time, while on January 1, 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 Orange is essentially constant during September, remaining within 0.1 miles per hour of 5.2 miles per hour throughout.

For reference, on December 30, the windiest day of the year, the daily average wind speed is 7.6 miles per hour, while on September 4, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.

The lowest daily average wind speed during September is 5.1 miles per hour on September 6.

The hourly average wind direction in Orange throughout September is predominantly from the west, with a peak proportion of 50% on September 3.

Orange 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 Orange is essentially constant during September, remaining within 1°F of 68°F throughout.

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 Orange 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 Orange are rapidly increasing during September, increasing by 616°F, from 3,514°F to 4,129°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 Orange is decreasing during September, falling by 1.2 kWh, from 7.0 kWh to 5.7 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Orange are 33.788 deg latitude, -117.853 deg longitude, and 187 ft elevation.

The topography within 2 miles of Orange contains only modest variations in elevation, with a maximum elevation change of 167 feet and an average elevation above sea level of 188 feet. Within 10 miles contains only modest variations in elevation (2,080 feet). Within 50 miles contains large variations in elevation (10,062 feet).

The area within 2 miles of Orange is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (83%) and shrubs (12%), and within 50 miles by shrubs (34%) and water (32%).