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.
Based on the tourism score, the best time of year to visit Sydney for warm-weather activities is from late November to early April.
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 22, with an average daily high temperature below 65°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 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
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 22 and lasts for 3.7 months, ending around October 11. 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 11 and lasts for 8.3 months, ending around June 22. 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 Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
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 7, 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 7 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
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 length of the day in Sydney varies significantly over the course of the year. In 2021, the shortest day is June 21, with 9 hours, 54 minutes of daylight; the longest day is December 22, with 14 hours, 25 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:31 AM on October 2, and the latest sunrise is 1 hour, 37 minutes later at 7:08 AM on April 3. The earliest sunset is at 4:52 PM on June 12, and the latest sunset is 3 hours, 17 minutes later at 8:09 PM on January 7.
Daylight saving time (DST) is observed in Sydney during 2021, starting in the spring on October 3 and ending in the fall on April 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases
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 4.1 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 0.5 miles per hour of 7.8 miles per hour throughout.
Average Wind Speed
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.
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 3.5 months, from January 1 to April 16, 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 17, 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
Best Time of Year to Visit
To characterize how pleasant the weather is in Sydney throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Sydney for general outdoor tourist activities is from late November to early April, with a peak score in the last week of December.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Sydney for hot-weather activities is from early January to early March, with a peak score in the second week of February.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Sydney 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.
Time Spent in Various Temperature Bands and the Growing Season
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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.
Growing Degree Days
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 3.2 months, from May 1 to August 8, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is June 16, with an average of 2.6 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Sydney are -33.868 deg latitude, 151.207 deg longitude, and 190 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%).
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.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.