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Newcastle Weather in December
December in Newcastle sees daytime temperatures around 25°C (77°F) and lows of 19°C (66°F) at night. With around 72 mm (2.8 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Newcastle in December
Historically, the month has about 10 days of rain, averaging 72 mm (2.8 in) in total. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Newcastle in December
Newcastle has excellent weather in December, with days reaching 25°C (77°F) and nights cooling to 19°C (66°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, March, April, May, September, October, November and December typically offer the best weather for Newcastle.
Newcastle Temperature in December
Min Temperature
19°C (66°F)
Max Temperature
25°C (77°F)
Chance of Rain
34%
Precipitation
72 mm (2.8 in)
Rainy days
10 days
Humidity
59% *
* Data from: Maitland, Australia (30 KM, 18 Miles).
Newcastle Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Newcastle - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Newcastle typically stay consistent throughout December, with daily highs averaging around 25°C (77°F). Nights are pleasant, with lows typically ranging from 17°C (63°F) to 19°C (66°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather records for Newcastle in December
Browse day-by-day weather records for Newcastle spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Newcastle historical weather extremes in December
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Newcastle.
- The hottest December day on record in Newcastle reached 40°C (104°F) (December 31, 2019).
- Newcastle experienced its chilliest December day on December 2, 1986, reaching only 17°C (63°F).
- Newcastle registered its coldest December night on December 12, 1986, with temperatures dropping to 8°C (46°F).
Best Places in Australia in December
Find out more about the weather in Australia and which places have the best travel conditions in this month. See all of Australia in December →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Newcastle in December
Comfortable temperatures call for an easy wardrobe in December. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days.
What To Do in Newcastle in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Newcastle 3-Day Forecast
More climate data for Newcastle
See the full Newcastle climate overview or explore weather in Australia.
Popular in December
Where to go in December - average daytime high across popular destinations.
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