Climate Insights for Onehunga

The climate in Onehunga is temperate. The average annual temperature is 16°C and approximately 1214mm of precipitation falls per year. Onehunga receives a notable amount of rainfall throughout the year, including during its driest month. Onehunga 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, March. The coldest months are August, July, June, when temperatures can drop to 10°C.

Onehunga sees moderate temperature variation throughout the year, ranging from 10°C to 24°C. February is the warmest month, though highs remain moderate at 24°C with a mean of 21°C. August is the coolest month, with minimum temperatures around 10°C and an average of 12°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between April and May, with a 2°C shift in average temperatures.

Onehunga is a fairly wet location, receiving approximately 1214mm of precipitation annually, which averages out to around 101mm per month. The wettest month is July, averaging 129mm of rainfall. September and August also tend to see above-average precipitation. The driest month is March, with just 76mm. That's 53mm less than July, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Onehunga is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months.

It is currently winter in Onehunga, which began on June 21, 2026. Onehunga 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 24°C, while the coldest stretch bottoms out in August near 10°C. Spring is next, beginning on September 23, 2026 (8 days from now).

The best time to visit Onehunga is during January, February, March, April and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 88mm per month. By contrast, August can be quite cold with temperatures dropping to 10°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Onehunga 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.