Rottnest Island Weather in September

Rottnest Island in September averages 19°C (66°F) during the day and 14°C (57°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Rottnest Island in September

The climate data from previous years indicates about 10 days of rain, averaging 71 mm (2.8 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 Rottnest Island in September

In September, Rottnest Island sees pleasant temperatures, with highs of 19°C (66°F). Nights drop to around 14°C (57°F). Conditions are often most pleasant around the middle of the day. Nights cool down to 14°C (57°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 Rottnest Island in September

The days are predominantly sunny, with an estimated total of around 230 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

For Rottnest Island itself, January, February, March, April, May, October, November and December generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.