Climate Insights for Alotau

The climate in Alotau is warm and mild. The average annual temperature is 24°C and approximately 3333mm of precipitation falls per year. Alotau receives a notable amount of rainfall throughout the year, including during its driest month. Alotau 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, December, January. The coldest months are August, July, September, when temperatures can drop to 21°C.

Alotau has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is February, when average highs reach 29°C and the mean temperature sits around 25°C. August is the coolest month, with minimum temperatures around 21°C and an average of 23°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.

Alotau is a very wet location, receiving approximately 3333mm of precipitation annually, which averages out to around 278mm per month. The wettest month is April, averaging 375mm of rainfall. January and March also tend to see above-average precipitation. The driest month is July, with just 191mm. That's 184mm less than April, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Alotau is relatively calm, with an average annual wind speed of 9km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 10km/h in winter, 9km/h in spring, 8km/h in summer, 8km/h in autumn.

It is currently autumn in Alotau, which began on March 20, 2026. Alotau 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 29°C, while the coldest stretch bottoms out in August near 21°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Alotau 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.