Winter Weather in Perth Australia

Daily high temperatures are around 65°F, rarely falling below 58°F or exceeding 73°F. The lowest daily average high temperature is 63°F on July 18.

Daily low temperatures are around 49°F, rarely falling below 40°F or exceeding 58°F. The lowest daily average low temperature is 48°F on July 18.

For reference, on February 11, the hottest day of the year, temperatures in Perth typically range from 65°F to 86°F, while on July 18, the coldest day of the year, they range from 48°F to 63°F.

The figure below shows you a compact characterization of the hourly average winter temperatures. 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.

Sherman Oaks, United States (9,336 miles away) and Sidi Smai’il, Morocco (9,240 miles) are the far-away foreign places with temperatures most similar to Perth (view comparison).

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The winter in Perth experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 30% to 20%.

The clearest day of the winter is August 31, with clear, mostly clear, or partly cloudy conditions 80% of the time.

For reference, on April 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 31%, while on January 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 86%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Perth, the chance of a wet day over the course of the winter is gradually decreasing, starting the season at 35% and ending it at 32%.

For reference, the year's highest daily chance of a wet day is 42% on July 21, and its lowest chance is 3% on December 29.

Rainfall

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

The average sliding 31-day rainfall during the winter in Perth is rapidly decreasing, starting the season at 4.0 inches, when it rarely exceeds 6.8 inches or falls below 1.5 inches, and ending the season at 2.9 inches, when it rarely exceeds 4.4 inches or falls below 1.5 inches.

The highest average 31-day accumulation is 4.7 inches on July 6.

Over the course of the winter in Perth, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 14 minutes, implying an average daily increase of 49 seconds, and weekly increase of 5 minutes, 41 seconds.

The shortest day of the winter is June 21, with 10 hours, 3 minutes of daylight and the longest day is August 31, with 11 hours, 25 minutes of daylight.

The latest sunrise of the winter in Perth is 7:17 AM on June 30 and the earliest sunrise is 43 minutes earlier at 6:34 AM on August 31.

The earliest sunset is 5:18 PM on June 11 and the latest sunset is 41 minutes later at 5:59 PM on August 31.

Daylight saving time is not observed in Perth during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:07 AM and sets 14 hours, 15 minutes later, at 7:22 PM, while on June 20, the shortest day of the year, it rises at 7:16 AM and sets 10 hours, 3 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 the winter of 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 Perth is essentially constant during the winter, remaining around 0% throughout.

For reference, on February 14, the muggiest day of the year, there are muggy conditions 8% of the time, while on August 13, 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 Perth is essentially constant during the winter, remaining within 0.4 miles per hour of 12.4 miles per hour throughout.

For reference, on January 23, the windiest day of the year, the daily average wind speed is 14.2 miles per hour, while on May 1, the calmest day of the year, the daily average wind speed is 11.4 miles per hour.

The highest daily average wind speed during the winter is 12.8 miles per hour on June 17.

The wind direction in Perth during the winter is predominantly out of the east from June 1 to June 8 and the west from June 8 to August 31.

Perth 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 Perth is decreasing during the winter, falling by 4°F, from 70°F to 66°F, over the course of the season.

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 Perth 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 Perth are very rapidly decreasing during the winter, decreasing by 4,717°F, from 5,112°F to 395°F, over the course of the season.

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 Perth is increasing during the winter, rising by 1.5 kWh, from 2.9 kWh to 4.4 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 2.6 kWh on June 22.

For the purposes of this report, the geographical coordinates of Perth are -31.952 deg latitude, 115.861 deg longitude, and 112 ft elevation.

The topography within 2 miles of Perth contains only modest variations in elevation, with a maximum elevation change of 325 feet and an average elevation above sea level of 66 feet. Within 10 miles also contains only modest variations in elevation (459 feet). Within 50 miles contains only modest variations in elevation (2,005 feet).

The area within 2 miles of Perth is covered by artificial surfaces (52%), sparse vegetation (19%), trees (14%), and water (13%), within 10 miles by artificial surfaces (51%) and trees (19%), and within 50 miles by water (37%) and trees (28%).