Mosman Weather in December

During December, Mosman experiences high daytime temperatures of 24°C (75°F) and cooler nights around 19°C (66°F). Expect quite a bit of rainfall. Around 64 mm (2.5 in) is typical.

Rainfall in Mosman in December

The climate data from previous years indicates about 10 days of rain, averaging 64 mm (2.5 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Mosman in December

Weather in Mosman is at its perfect in December. Highs reach 24°C (75°F), while nights settle around 19°C (66°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 19°C (66°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Mosman in December

With approximately 257 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Wind Speed in Mosman in December

Wind speeds average 4 m/s (8 knots) during December. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in December

With water at 20°C (68°F), conditions are good for swimming and other water activities. You won't need a wetsuit and most people find it very comfortable.

If your ideal day consists of dry skies and pleasant temperatures, January, March, April, May, September, October, November and December typically offer the best circumstances for Mosman.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Mosman's climate page.

Mosman Temperature in December

Min Temperature 19°C (66°F)  

Max Temperature 24°C (75°F)  

Water Temperature 20°C (68°F) *  

Chance of Rain 34%  

Precipitation 64 mm (2.5 in)  

Rainy days 10 days  

Humidity 58% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 257 hours *  

Percentage Sunshine 55% *  

* Data from: Sydney, Australia (14 KM, 8 Miles).

What to Wear in Mosman in December

Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 20°C (68°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Mosman in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

10/10

Walking

10/10

Barbeque

8/10

Camping

8/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Mosman's climate page.

More climate data for Mosman

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Mosman climate overview or explore weather in Australia.