Mosman Weather in September

In Mosman, September brings pleasant daytime temperatures around 20°C (68°F), with nights cooling to 13°C (55°F). It is the driest month of the year, with minimal rainfall.

Rainfall in Mosman in September

Expect fewer clouds and less rain as the month goes on. This makes it an ideal time for outdoor activities. Looking at the last 30 years, the data shows about 10 days with rain, averaging 55 mm (2.2 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 September

Mosman in September is worth a visit. The temperature is perfect, with 20°C (68°F) during the day and 13°C (55°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Mosman in September

Enjoy a sunny month with about 234 hours of sunshine, the clear skies make Mosman even more beautiful.

Wind Speed in Mosman in September

Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.

Average water temperature in September

The water temperature is 17°C (63°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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 September

Min Temperature 13°C (55°F)  

Max Temperature 20°C (68°F)  

Water Temperature 17°C (63°F) *  

Chance of Rain 33%  

Precipitation 55 mm (2.2 in)  

Rainy days 10 days  

Humidity 50% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 234 hours *  

Percentage Sunshine 66% *  

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

What to Wear in Mosman in September

For Mosman in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. With water temperatures around 17°C (63°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Mosman in September

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

Cycling

10/10

Walking

10/10

Barbeque

9/10

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.