Climate Overview
The climate in Kiwai Island is hot. The average annual temperature is 27°C and approximately 2662mm of precipitation falls per year. Kiwai Island receives a notable amount of rainfall throughout the year, including during its driest month. Kiwai Island sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Kiwai Island has relatively stable temperatures year-round, staying within a 7°C range. The warmest month is December, when average highs reach 31°C and the mean temperature sits around 28°C. August is the coolest month, with minimum temperatures around 24°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.
Precipitation
Kiwai Island is a very wet location, receiving approximately 2662mm of precipitation annually, which averages out to around 222mm per month. The wettest month is March, averaging 373mm of rainfall. April and February also tend to see above-average precipitation. The driest month is August, with just 94mm. That's 279mm less than March, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
Kiwai Island is mildly breezy, with an average annual wind speed of 16km/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 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in December, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/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 19km/h in winter, 17km/h in spring, 13km/h in summer, 14km/h in autumn.
Seasons
89 days until Winter
It is currently autumn in Kiwai Island, which began on March 20, 2026. Kiwai Island sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in December at around 31°C, while the coldest stretch bottoms out in August near 24°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 24 to 31°C. Rainfall is heavy, totalling around 400mm across the season with a monthly average of 133mm. Winds are moderate at around 17km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 31°C. Rainfall is heavy, totalling around 905mm across the season with a monthly average of 302mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 31°C. Rainfall is heavy, totalling around 1003mm across the season with a monthly average of 334mm. Winds are generally light, averaging 14km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 28°C. Rainfall is heavy, totalling around 356mm across the season with a monthly average of 119mm. Winds are moderate at around 19km/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 Kiwai Island 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.
