Climate Overview
The climate in Alotau is warm and mild. The average annual temperature is 25°C and approximately 3373mm 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, March. The coldest months are August, July, September, when temperatures can drop to 21°C.
Temperature
Alotau has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is February, when average highs reach 30°C and the mean temperature sits around 26°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 5°C between highs and lows.
Precipitation
Alotau is a very wet location, receiving approximately 3373mm of precipitation annually, which averages out to around 281mm per month. The wettest month is March, averaging 405mm of rainfall. January and April also tend to see above-average precipitation. The driest month is August, with just 211mm. That's 195mm less than March, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.
Wind
Alotau is relatively calm, with an average annual wind speed of 2km/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 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
93 days until Spring
It is currently winter in Alotau, which began on June 21, 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 30°C, while the coldest stretch bottoms out in August near 21°C. Spring is next, beginning on September 23, 2026 — 93 days from now.
Spring
Temperatures range from 22 to 29°C. Rainfall is heavy, totalling around 849mm across the season with a monthly average of 283mm. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 30°C. Rainfall is heavy, totalling around 902mm across the season with a monthly average of 301mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 29°C. Rainfall is heavy, totalling around 953mm across the season with a monthly average of 318mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 26°C. Rainfall is heavy, totalling around 669mm across the season with a monthly average of 223mm. Winds are generally light, averaging 2km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
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.
