Climate Overview
The climate in Sepik Plains is hot. The average annual temperature is 27°C and approximately 2858mm of precipitation falls per year. Sepik Plains receives a notable amount of rainfall throughout the year, including during its driest month. Sepik Plains sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Sepik Plains has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is October, when average highs reach 32°C and the mean temperature sits around 27°C. July is the coolest month, with minimum temperatures around 24°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.
Precipitation
Sepik Plains is a very wet location, receiving approximately 2858mm of precipitation annually, which averages out to around 238mm per month. The wettest month is April, averaging 304mm of rainfall. March and December also tend to see above-average precipitation. The driest month is August, with just 145mm. That's 159mm 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.
Wind
Sepik Plains is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
89 days until Winter
It is currently autumn in Sepik Plains, which began on March 20, 2026. Sepik Plains sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in October at around 32°C, while the coldest stretch bottoms out in July near 24°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 707mm across the season with a monthly average of 236mm. Winds are generally light, averaging 8km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 837mm across the season with a monthly average of 279mm. Winds are generally light, averaging 9km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 808mm across the season with a monthly average of 269mm. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 506mm across the season with a monthly average of 169mm. Winds are generally light, averaging 8km/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 Sepik Plains 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.
