Climate Insights for Garden Island

The climate in Garden Island is warm and mild. The average annual temperature is 19°C and approximately 573mm of precipitation falls per year. July is the wettest month, receiving around 113mm of rainfall. Garden Island is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, January, December. The coldest months are August, July, June, when temperatures can drop to 11°C.

Garden Island sees moderate temperature variation throughout the year, ranging from 11°C to 28°C. The warmest month is February, when average highs reach 28°C and the mean temperature sits around 24°C. August is the coolest month, with minimum temperatures around 11°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between March and April, with a 3°C shift in average temperatures.

Garden Island is a relatively dry area, receiving approximately 573mm of precipitation annually, which averages out to around 48mm per month. The wettest month is July, averaging 113mm of rainfall. June and August also tend to see above-average precipitation. The driest month is December, with just 6mm. That's 107mm less than July, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Garden Island is moderately windy, with an average annual wind speed of 26km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 29km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 23km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 25km/h in winter, 26km/h in spring, 28km/h in summer, 24km/h in autumn.

It is currently autumn in Garden Island, which began on March 20, 2026. Garden Island is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 28°C, while the coldest stretch bottoms out in August near 11°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Garden Island is during January, February, March, April, May, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 29mm per month. By contrast, August can be quite cold with temperatures dropping to 11°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Garden Island based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.