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Average Weather in Sydney Australia

In Sydney, the summers are warm and partly cloudy and the winters are short, cool, and mostly clear. Over the course of the year, the temperature typically varies from 47°F to 80°F and is rarely below 42°F or above 90°F.

The warm season lasts for 3.9 months, from November 26 to March 22, with an average daily high temperature above 76°F. The hottest day of the year is January 25, with an average high of 80°F and low of 68°F.

The cool season lasts for 2.8 months, from May 29 to August 23, with an average daily high temperature below 66°F. The coldest day of the year is July 19, with an average low of 47°F and high of 62°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Sydney12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoldcoolcomfortablewarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

In Sydney, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Sydney begins around June 21 and lasts for 3.7 months, ending around October 12. On August 13, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 80% of the time, and overcast or mostly cloudy 20% of the time.

The cloudier part of the year begins around October 12 and lasts for 8.3 months, ending around June 21. On November 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 38% of the time, and clear, mostly clear, or partly cloudy 62% of the time.

Cloud Cover

Cloud Cover in Sydneyclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecNov 2238%Nov 2238%Aug 1320%Aug 1320%Jun 2130%Jun 2130%Oct 1229%Oct 1229%overcastmostly cloudypartly cloudymostly clearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Sydney varies throughout the year.

The wetter season lasts 7.5 months, from October 21 to June 6, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 30% on January 31.

The drier season lasts 4.5 months, from June 6 to October 21. The smallest chance of a wet day is 16% on August 13.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 30% on January 31.

Daily Chance of Precipitation

Daily Chance of Precipitation in Sydneywetwetdry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 3130%Jan 3130%Aug 1316%Aug 1316%Jan 122%Jan 122%Oct 2123%Oct 2123%Jun 623%Jun 623%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Sydney experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Sydney. The most rain falls during the 31 days centered around February 7, with an average total accumulation of 4.2 inches.

The least rain falls around September 4, with an average total accumulation of 1.8 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Sydney varies significantly over the course of the year. In 2017, the shortest day is June 21, with 9 hours, 54 minutes of daylight; the longest day is December 21, with 14 hours, 25 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:33 AM on September 30, and the latest sunrise is 1 hour, 33 minutes later at 7:07 AM on April 1. The earliest sunset is at 4:52 PM on June 10, and the latest sunset is 3 hours, 17 minutes later at 8:10 PM on January 7.

Daylight saving time (DST) is observed in Sydney during 2017, starting in the spring on October 1 and ending in the fall on April 2.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Sydney12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecSep 305:33 AMSep 305:33 AM8:10 PMJan 78:10 PMJan 7Jun 104:52 PMJun 104:52 PM7:07 AMApr 17:07 AMApr 1DSTApr 2DSTApr 2Oct 1DSTOct 1DSTdaynightnight
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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.

Sydney experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.0 months, from November 30 to April 1, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The muggiest day of the year is February 5, with muggy conditions 41% of the time.

The least muggy day of the year is July 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in Sydneymuggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 110%Jul 110%Feb 541%Feb 541%Nov 3010%Nov 3010%Apr 111%Apr 111%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Sydney does not vary significantly over the course of the year, remaining within 0.2 miles per hour of 4.2 miles per hour throughout.

Average Wind Speed

Average Wind Speed in Sydney0 mph1 mph2 mph3 mph4 mph5 mph6 mphJanFebMarAprMayJunJulAugSepOctNovDecAug 24.5 mphAug 24.5 mphApr 84.0 mphApr 84.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Sydney varies throughout the year.

The wind is most often from the south for 2.1 months, from March 22 to May 26, with a peak percentage of 36% on April 29. The wind is most often from the west for 3.9 months, from May 26 to September 23, with a peak percentage of 44% on July 3. The wind is most often from the east for 4.5 months, from November 8 to March 22, with a peak percentage of 39% on January 1.

Wind Direction

Wind Direction in SydneyESWNE0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Sydney 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.6 months, from December 31 to April 17, with an average temperature above 72°F. The day of the year with the warmest water is February 11, with an average temperature of 74°F.

The time of year with cooler water lasts for 3.8 months, from June 23 to October 18, with an average temperature below 66°F. The day of the year with the coolest water is August 16, with an average temperature of 64°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from November 2 to February 14, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest day of the year is December 31, with an average of 7.8 kWh.

The darker period of the year lasts for 3.3 months, from April 30 to August 9, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest day of the year is June 16, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Sydneybrightbrightdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJanFebMarAprMayJunJulAugSepOctNovDecDec 317.8 kWhDec 317.8 kWhJun 162.6 kWhJun 162.6 kWhNov 26.7 kWhNov 26.7 kWhFeb 146.7 kWhFeb 146.7 kWhApr 303.6 kWhApr 303.6 kWhAug 93.7 kWhAug 93.7 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Sydney are -33.868 deg latitude, 151.207 deg longitude, and 79 ft elevation.

The topography within 2 miles of Sydney contains only modest variations in elevation, with a maximum elevation change of 387 feet and an average elevation above sea level of 69 feet. Within 10 miles contains only modest variations in elevation (728 feet). Within 50 miles contains significant variations in elevation (3,232 feet).

The area within 2 miles of Sydney is covered by artificial surfaces (54%), water (29%), and sparse vegetation (12%), within 10 miles by artificial surfaces (38%) and water (35%), and within 50 miles by water (50%) and trees (38%).

Data Sources

This report illustrates the typical weather in Sydney, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Sydney.

For each station, the records are corrected for the elevation difference between that station and Sydney according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Sydney is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sydney and a given station.

The stations contributing to this reconstruction are: Sydney International Airport (98%, 9 kilometers, south) and Newcastle Airport (1.8%, 133 kilometers, northeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.