Rottnest Island Weather & Climate: Best Time to Visit

In Rottnest Island, seasonal changes bring about a moderate variation in temperatures. Typically, average maximum daytime temperatures range from a comfortable 26°C (79°F) in February to a pleasant 19°C (66°F) in the coolest month, August.

Nights vary from 21°C (70°F) in February to around 14°C (57°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Rottnest Island experiences moderate precipitation patterns, averaging 743 mm (29 in) yearly. The climate in Rottnest Island shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 157 mm (6.2 in) of precipitation over 14 rainy days.

In contrast, the driest month December offers drier and sunnier days, with around 9.5 mm (0.4 in) of rainfall over 4 rainy days. For more details, please visit our Rottnest Island Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Rottnest Island serves as an ideal destination. Expect longer, more sun-filled days in January with an average of 11.8 hours of sunshine daily, and embrace the darker days in June, offering only 5.9 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is moderate throughout the year in Rottnest Island.

The city experiences its highest humidity in July, reaching 57%. In February, the humidity drops to its lowest level at 38%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year