Climate Insights for Portarlington

The climate in Portarlington is temperate. The average annual temperature is 15°C and approximately 622mm of precipitation falls per year. Portarlington receives a notable amount of rainfall throughout the year, including during its driest month. Portarlington 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: January, February, December. The coldest months are July, August, June, when temperatures can drop to 9°C.

Portarlington sees moderate temperature variation throughout the year, ranging from 9°C to 22°C. January is the warmest month, though highs remain moderate at 22°C with a mean of 20°C. July is the coolest month, with minimum temperatures around 9°C and an average of 11°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Portarlington is a relatively dry area, receiving approximately 622mm of precipitation annually, which averages out to around 52mm per month. The wettest month is October, averaging 67mm of rainfall. April and November also tend to see above-average precipitation. The driest month is February, with just 32mm. That's 35mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Portarlington is moderately windy, with an average annual wind speed of 29km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 30km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in June, with average winds dropping to 26km/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 autumn in Portarlington, which began on March 20, 2026. Portarlington 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 January at around 22°C, while the coldest stretch bottoms out in July near 9°C. Winter is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Portarlington is during January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 50mm per month. By contrast, July can be quite cold with temperatures dropping to 9°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Portarlington 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.