Climate Overview
The climate in Ketapang / Rahadi Usmaman is hot. The average annual temperature is 27°C and approximately 2998mm of precipitation falls per year. Ketapang / Rahadi Usmaman receives a notable amount of rainfall throughout the year, including during its driest month. Ketapang / Rahadi Usmaman sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Ketapang / Rahadi Usmaman has relatively stable temperatures year-round, staying within a 3°C range. The warmest month is May, when average highs reach 29°C and the mean temperature sits around 28°C. September is the coolest month, with minimum temperatures around 26°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.
Precipitation
Ketapang / Rahadi Usmaman is a very wet location, receiving approximately 2998mm of precipitation annually, which averages out to around 250mm per month. The wettest month is December, averaging 398mm of rainfall. November and January also tend to see above-average precipitation. The driest month is August, with just 114mm. That's 285mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
Ketapang / Rahadi Usmaman is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 26km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in April, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 10km/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 24km/h in winter, 20km/h in spring, 22km/h in summer, 18km/h in autumn.
Seasons
89 days until Winter
It is currently autumn in Ketapang / Rahadi Usmaman, which began on March 20, 2026. Ketapang / Rahadi Usmaman sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in May at around 29°C, while the coldest stretch bottoms out in September near 26°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 794mm across the season with a monthly average of 265mm. Winds are moderate at around 20km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 964mm across the season with a monthly average of 321mm. Winds are moderate at around 22km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 782mm across the season with a monthly average of 261mm. Winds are moderate at around 18km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 458mm across the season with a monthly average of 153mm. Winds are moderate at around 24km/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 Ketapang / Rahadi Usmaman 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.
