December Weather in Sydney, Australia

Last updated: February 26, 2025

Sydney experiences a vibrant December, characterized by warm temperatures and a mix of sunny and rainy days. With maximum highs reaching 30°C (87°F) and an average of 21°C (70°F), the weather is ideal for outdoor activities. Nights cool down to a pleasant 15°C (60°F), providing a refreshing contrast. December also brings 78 mm (3.1 in) of precipitation over about 11 days, contributing to the city's lush landscapes. The humidity level stands at 68%, adding a touch of tropical warmth to this bustling Australian metropolis.

December Temperature in Sydney

In Sydney, Australia, December marks the beginning of summer, showcasing a delightful transition in temperatures. The month typically sees minimums around 15°C (60°F), while the average hovers at 21°C (70°F), and maximums can reach up to 30°C (87°F). Compared to the preceding months, December is noticeably warmer, offering more sunshine and perfect beach weather. As the year winds down, the warmth of December contrasts sharply with the cooler temperatures of the southern winter months, inviting locals and visitors alike to embrace outdoor activities and festive cheer. This pattern not only highlights a shift toward summer but also signals the peak of Sydney's vibrant outdoor lifestyle.

December Weather in Sydney: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sydney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec737371676258575761646770
Data source: Temperature data for Sydney generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Sydney

December in Sydney experiences a moderate level of precipitation, with 78 mm (3.1 in) recorded over 11 days. This marks a slight decrease compared to the wetter months of March and February, which see significantly higher rainfall, but still maintains a consistent pattern of precipitation as summer approaches. The city's shift from the cooler, drier months of winter highlights a gradual increase in rainfall, suggesting a transition into a more humid and vibrant season. As the year wraps up, Sydney's December showcases a blend of sunny days interspersed with refreshing rain, setting the stage for the warm summer ahead.

December Precipitation Trends in Sydney

The chart displays monthly precipitation patterns in Sydney, with values for each month alongside December's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec421251864063108545349858578
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Sydney

In Sydney, Australia, December marks a transition into warmer summer months, with average humidity levels at 68%. This increase is consistent with a noticeable trend throughout the year, where humidity typically rises from the drier spring months of October and November, which saw levels at 55% and 57%, respectively. The humidity steadily climbs to reach its peak in April at 75%, before gradually tapering off again as autumn sets in. Such fluctuations illustrate Sydney's characteristic climate, where the balmy summer humidity gives way to a slightly drier, more comfortable autumn, making December a vibrant blend of warmth and moisture as the city gears up for the festive season.

December Average Humidity in Sydney

This chart illustrates the average monthly humidity levels in Sydney, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec65%69%72%75%74%72%68%67%63%55%58%68%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sydney

In December, Sydney experiences some of the year's highest UV levels, with an extreme UV Index of 14—the same as in January and February. The burn time remains a mere 10 minutes, emphasizing the need for sun protection during this peak summer month. This trend of elevated UV exposure continues from November, where the index stood at 12, reflecting the intense summer sun and its potential risks. As outdoor enthusiasts flock to the beaches, it’s essential to stay vigilant against overexposure, ensuring both safety and enjoyment under the Australian sun. For more detailed information on UV levels, visit Sydney UV Index.

Maximum UV Index Levels in Sydney for December

The chart shows the monthly maximum UV Index (UVI) for Sydney in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec141311853468101214
Data source: Sydney December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in Sydney

As December rolls into Sydney, the sun shines brighter than ever, with an impressive 319 hours of glorious sunshine, marking it as the sunniest month of the year. This peak in sunshine hours reflects a vibrant trend throughout the latter part of the year, where daylight gradually increases, from a cozy 253 hours in May to an exhilarating 305 hours in November. As the year draws to a close, the warmth of December not only invites residents and visitors alike to revel in outdoor activities but also signals the heart of summer in Australia. This steady rise in sunlight hours toward the year's end creates the perfect backdrop for festive celebrations and beach outings, showcasing why Sydney is cherished for its radiant summertime charm.

Monthly Sunshine Duration in Sydney: December Highlighted

The December sunshine duration represents the total number of hours Sydney experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec251h274h270h269h253h225h248h273h287h297h305h319h
Data source: Sydney December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sydney During December

December in Sydney brings a chance of sunny weather at 42%, which may seem modest compared to other months. Notably, this figure is a slight uptick from November's 25%, indicating that the city's summer vibe is starting to shimmer. However, when set against the backdrop of the sunniest months of April and August—both boasting over 60% chance—it's clear that December can be hit-or-miss. Still, as the year winds down, the potential for warm, sunny days gradually increases, inviting Sydneysiders to embrace outdoor festivities despite the fluctuating odds.

Percentage of Sunny Days in December in Sydney

The chart illustrates the percentage of sunny days in Sydney throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Sydney experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec47%41%38%68%57%51%61%68%61%55%25%42%
Data source: Sydney December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sydney in December

As the year winds through its seasons, Sydney, Australia experiences a captivating rhythm of daylight duration. In December, the city basks in 14 hours of sunlight, a peak that mirrors its summer solstice. This abundance of daylight is a delightful contrast to the shorter days of June, when sunlight is limited to just 9 hours. The transition from midsummer in January with 14 hours of daylight, through the gradual decrease in March to 12 hours, highlights a gentle ebb towards autumn. By the time May arrives, daylight shrinks to 10 hours, leading into the crisp winter months. Yet, as spring approaches in September, the hours gradually increase once more, heralding longer days and vibrant life returning to Sydney. This cyclical pattern of day length shapes not only the landscape but also the lifestyle, inviting residents and visitors alike to revel in the sun-drenched beauty of this Australian gem.

Average Daylight Hours in Sydney for December

The chart illustrates the variation in daylight duration in Sydney throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec14h 6m13h 17m12h 15m11h 12m10h 20m9h 55m10h 8m10h 53m11h 52m12h 55m13h 51m14h 20m
Data source: Sydney daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Sydney

In Sydney, Australia, the winds of December offer a gentle reminder that summer is right around the corner, with an average wind speed of 5.1 m/s (11 mph). Observing the trends throughout the year, we see a gradual increase in wind speeds from the milder 3.5 m/s in April to a peak in March at 5.7 m/s (13 mph). Following this peak, the winds maintain a relatively consistent strength, only dipping slightly as December approaches. This consistency, especially when compared to the earlier part of the year, showcases a transition from the briskness of winter winds to the warmer, more inviting breezes of summer, creating an ideal atmosphere for festive outdoor gatherings as the year draws to a close.

Average December Wind Speed in Sydney

The chart displays monthly wind speed patterns in Sydney, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.25.35.73.54.65.05.65.05.74.65.55.1 m/s
Data source: Sydney December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Sydney Compares to Other Months

The weather in Sydney changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Sydney and find detailed weather information for every month.

December and January both showcase warm weather, but they exhibit some key differences. In December, the average temperatures range from a minimum of 15°C (60°F) to a maximum of 30°C (87°F), with a higher average humidity of 68%. The month also sees significant rainfall, totaling 78 mm (3.1 in) over 11 days. In contrast, January experiences slightly warmer conditions, with temperatures ranging from a minimum of 16°C (62°F) to a maximum of 34°C (93°F) and a lower humidity level of 65%. Precipitation is also reduced in January, with only 42 mm (1.7 in) falling over 9 days. For more detailed insights on conditions during this month, check out Sydney weather in January.

In comparing the weather of December and February, we see a general warming trend, with December featuring a temperature range from a minimum of 15°C (60°F) to a maximum of 30°C (87°F), while February boasts a minimum of 17°C (62°F) and a maximum of 35°C (95°F). Additionally, February experiences higher precipitation, with 125 mm (4.9 in) over 13 days compared to December's 78 mm (3.1 in) over 11 days. Despite the increase in rainfall, humidity remains relatively stable, with December at 68% and February slightly higher at 69%. For a deeper dive into Sydney's climate specifics, you can explore Sydney weather in February.

In December, the weather typically features a minimum temperature of 15°C (60°F) and an average high of 30°C (87°F), with a total precipitation of 78 mm (3.1 in) over about 11 days. The humidity hovers around 68%, providing a warm and somewhat humid atmosphere. In contrast, March sees slightly warmer temperatures, with a similar minimum of 15°C (59°F) but an average maximum of 33°C (92°F). Rainfall significantly increases to 185 mm (7.3 in) across 18 days, resulting in higher humidity levels at 72%. For more detailed insights on the climate, you can check out Sydney weather in March.

In December, Sydney experiences warmer conditions with minimum temperatures around 15°C (60°F) and maximums reaching up to 30°C (87°F). The average temperature hovers at 21°C (70°F), alongside a rainfall of 78 mm (3.1 in) over approximately 11 days, coupled with a humidity level of 68%.

In contrast, April sees slightly cooler temperatures, with minimums at 12°C (54°F) and an average of 19°C (67°F), while maximum temperatures remain similar at 30°C (86°F). Precipitation decreases to 40 mm (1.6 in) across around 9 days, and humidity rises to 75%, making it feel a bit more humid. For a detailed look at Sydney’s weather patterns during this month, visit Sydney weather in April.

In Sydney, December boasts warmer temperatures, with a minimum of 15°C (60°F) and an average of 21°C (70°F), peaking at 30°C (87°F). This month also sees higher levels of precipitation, totaling 78 mm (3.1 in) over about 11 days, alongside a humidity level of 68%. Conversely, May experiences milder weather, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 24°C (76°F) and an average of 17°C (62°F). Precipitation is slightly lower at 63 mm (2.5 in) across 9 days, accompanied by a higher humidity of 74%. For more details, check out Sydney weather in May.

December and June display contrasting weather patterns. In December, temperatures range from a pleasant 15°C (60°F) to a warm high of 30°C (87°F), offering an average of 21°C (70°F). The month experiences moderate precipitation of 78 mm (3.1 in) across about 11 days, with humidity levels at 68%. Conversely, June sees significantly cooler temperatures, with a minimum of 8°C (47°F) and a maximum of 22°C (72°F), resulting in an average of just 14°C (58°F). This month also records higher rainfall at 108 mm (4.3 in) over approximately 15 days, accompanied by slightly higher humidity at 72%. To learn more about the specifics of Sydney's weather during June, you can visit Sydney weather in June.

December and July present quite contrasting weather patterns. In December, temperatures are notably warmer, with a minimum of 15°C (60°F) and maximums reaching up to 30°C (87°F), while July sees cooler temperatures, ranging from a minimum of 6°C (44°F) to a maximum of 23°C (74°F). Additionally, December experiences more precipitation, averaging 78 mm (3.1 in) over 11 days, compared to July's 54 mm (2.1 in) over just 6 days. Interestingly, both months share the same humidity level of 68%, making them equally humid despite the temperature differences. For a closer look at Sydney's weather during July, you can find more details here: Sydney weather in July.

In December, the weather in Sydney is significantly warmer than in August, with average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 30°C (87°F), compared to August's cooler range of 8°C (46°F) to 22°C (72°F). December experiences more rainfall, with 78 mm (3.1 in) of precipitation over 11 days, while August sees only 53 mm (2.1 in) across 6 days. Despite the higher temperatures and increased precipitation in December, humidity levels remain similar, hovering around 68% in December and 67% in August. For more details about Sydney's climate in August, you can check Sydney weather in August.

In comparing December and September weather, December tends to be warmer and more humid. With average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 30°C (87°F), December's warmth is significantly higher than September’s, which has an average temperature range from 10°C (50°F) to 28°C (83°F). Additionally, December experiences more precipitation, with about 78 mm (3.1 in) over 11 days, compared to September's 49 mm (1.9 in) spread across 8 days. Humidity levels are also slightly elevated in December at 68%, compared to September's 63%. For more detailed information, you can check Sydney weather in September.

December's weather is generally warmer and more humid compared to October. With minimum temperatures averaging at 15°C (60°F) and maximums reaching 30°C (87°F), December experiences a slightly wider temperature range than October, which typically sees minimums of 12°C (54°F) and maximums of 29°C (84°F). Additionally, December has an average humidity of 68%, creating a muggier feel compared to October's lower humidity level of 55%. While both months experience notable rainfall, December has slightly less precipitation (78 mm) than October (85 mm), though both months see comparable rainy days—11 in December and 12 in October. For more detailed information, you can check Sydney weather in October.

December weather in Sydney features slightly warmer temperatures compared to November, with average highs reaching 30°C (87°F) versus November's maximum of 34°C (94°F). While December maintains a comfortable average of 21°C (70°F), November experiences a lower average of 19°C (67°F) but includes cooler minimum temperatures. Precipitation levels are fairly comparable, with December receiving 78 mm (3.1 in) over 11 days, while November sees a bit more rain at 85 mm (3.3 in) across 10 days. Furthermore, December exhibits higher humidity at 68%, compared to November's 57%, contributing to a more tropical feel as the year closes. For more details on November weather, you can refer to Sydney weather in November.

Compare Sydney's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Sydney

As December unfolds in Sydney, the city experiences a delightful shift into summer, showcasing warmer temperatures and an inviting atmosphere. With average temperatures rising, residents and visitors enjoy a vibrant outdoor lifestyle, despite occasional rain, which adds to the lush greenery of the region. The humidity levels hover around a comfortable percentage, enhancing the warmth without becoming oppressive. This contrast from the cooler months makes December an enticing time to explore Sydney’s stunning beaches and outdoor activities. For more details on the unique weather characteristics throughout the year, visit Sydney Climate.