As Australia moves into the heat of summer, tomorrow, Friday, December 19, 2025, is shaping up to be a day of extreme contrasts. While the southern and eastern states face a surge of "pre-Christmas" heat, the northern tropics are bracing for the arrival of the monsoon.
Here is your comprehensive weather guide for Australia tomorrow.
🌡️ The "Sizzling South" Heatwave
A mass of hot air is currently sweeping across the continent, bringing record-breaking December temperatures to several major cities.
Melbourne: Prepare for a swelter. The city is forecast to hit 37°C–38°C tomorrow, potentially its hottest day in nearly a year.
Adelaide: After a blistering Thursday (reaching 39°C), temperatures will begin to moderate slightly but remain high at 30°C before a cooler change arrives for the weekend.
Canberra: Expect a very hot and sunny day with a top of 36°C.
Perth: The west coast remains hot and dry with a forecast high of 30°C.
⚠️ Fire Warning: Total Fire Bans have been declared for several districts in South Australia (Riverland and Murraylands) with "Extreme" fire danger ratings. Please stay vigilant and follow local CFS advice.
⛈️ The Tropical Monsoon & Storms
While the south bakes, the north is getting wet. Meteorologists are tracking the first active monsoon phase of the season.
Darwin: Heavy rain and thunderstorms are expected as the monsoon builds, with a top of 32°C.
Brisbane: A "mixed bag" day with a high of 29°C and a medium chance of showers or a late thunderstorm.
Northern NT & WA: Severe weather warnings are in place for heavy rainfall and damaging winds across the Arnhem district and parts of the Kimberley.
☁️ Coastal Forecast: Sydney & Hobart
Sydney: A humid and mostly cloudy day is on the cards. Highs will reach 31°C, though onshore winds might bring a light shower to the coast in the afternoon.
Hobart: Tasmania escapes the heatwave. Expect a much cooler 21°C with cloud cover and a chance of morning drizzle.
📅 Quick City Summary: Dec 19, 2025
| City | Min | Max | Conditions |
| Sydney | 22°C | 31°C | Mostly cloudy, humid |
| Melbourne | 22°C | 38°C | Very hot and sunny |
| Brisbane | 18°C | 29°C | Possible showers/storms |
| Perth | 18°C | 30°C | Sunny and dry |
| Adelaide | 23°C | 30°C | Mostly sunny, easing heat |
| Hobart | 13°C | 21°C | Cloudy, mild |
| Darwin | 26°C | 32°C | Monsoon rain & storms |
💡 Pro-Tips for Tomorrow:
Hydrate: Especially in Melbourne and Canberra, where the dry heat will be intense.
UV Protection: The UV index will be Extreme across most of the country. Apply sunscreen even if it looks cloudy in Sydney or Brisbane.
Check the Apps: With active monsoon and fire warnings, keep an eye on the BOM Weather app for real-time alerts.
Planning a trip for the weekend?
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