Christmas is right around the corner, and the weather gurus have peered into their crystal (weather) ball to reveal what's in store for 25 December 2025. Will it be a scorcher fit for backyard barbecues, pool parties, and prawns on the deck, or will we be taking cover under Nana's pergola with a cuppa and Christmas pudding? Sydney's Christmas Day weather for 2025 is looking a little chilly and rainy, with temperatures sitting at 21°C and a few showers on the horizon.

Australia's Christmas Day weather forecast is always a hot topic (literally), and this year's early predictions are already giving families clues about whether to prep the sunscreen or the umbrellas. Here's what the experts are saying about Australia's Christmas Day weather for 2025 and how it could shape your festive celebrations.

Will it Rain on Christmas Day in Sydney 2025?

Sydney weather is wildly unpredictable at the best of times, but when Christmas rolls around, you better believe we're crossing fingers, toes, and arms to banish any dark clouds from spoiling our day. 

When it comes to the all-important question of will it rain on Christmas Day in Sydney? the early forecast for Sydney's Christmas Day weather in 2025 is looking a bit dreary with rain on the forecast - boo!

According to AccuWeather's forecast, Thursday, 25 December 2025, is expected to be a chilly 21°C. We're expecting cloudy skies throughout the day. Rain is 58% likely in the morning, and there is 0% chance of thunderstorms, so it's unlikely to ruin the day.

The temperature will drop even lower to 17°C on Christmas night, and the probability of rain will drop to 7%.

Boxing Day Weather in Sydney 2025

The weather on Boxing Day 2025 is expected to improve, with temperatures rising to 20°C and sunnier skies. There's no rain predicted for Boxing Day.

Don't Forget About the UV Index

As always, Christmas and Boxing Day are a fantastic time for families to enjoy the outdoors, but it's also a day to stay sun-smart and heat-aware. UV levels can be high even when the temperature feels comfortable. The UV index is expected to be 4.0 (mild), so sunscreen remains a priority if you're heading out for the day. Remember to reapply throughout the day, especially after swimming or sweating. If you're heading to a beach or park, set up a base with plenty of shade from umbrellas, cabanas, pop-up tents or even under a shady tree. Keep everyone hydrated by packing plenty of water and encouraging regular sips, even if no one is thirsty. 

The Best Outdoor Activities For Families

With just an hour or two of rain predicted for this Christmas, it's the perfect opportunity to lap up the outdoors with some wholesome family activities. You can start the morning by soaking up some stunning views with these spectacular Coastal Walks in Sydney, or strap on your walking shoes and get off the beaten track on a Family-Friendly Bushwalk. For something a little more relaxing, go for a refreshing dip at Sydney's Best Beaches or a playful splash at these Free Water Parks. And go with tradition on the 26th and head out for an epic Boxing Day Picnic - don't forget your cricket gear! 

What's Open On Christmas Day in Sydney?

If you are looking for a Christmas lunch without the clean-up, book one of the Best Christmas Day Lunches For Families and see What's Open On Christmas Day in Sydney.

Have you signed up to our newsletter? Join ellaslist to get the best family and kid-friendly events, venues, classes and things to do NEAR YOU!