Climate Overview
The climate in Ketapang / Rahadi Usmaman is hot. The average annual temperature is 27°C and approximately 3029mm 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 3029mm of precipitation annually, which averages out to around 252mm per month. The wettest month is December, averaging 441mm of rainfall. November and April also tend to see above-average precipitation. The driest month is August, with just 68mm. That's 373mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Ketapang / Rahadi Usmaman is relatively calm, with an average annual wind speed of 4km/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 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 2km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.
Seasons
84 days until Spring
It is currently winter in Ketapang / Rahadi Usmaman, which began on June 21, 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. Spring is next, beginning on September 23, 2026 — 84 days from now.
Spring
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 838mm across the season with a monthly average of 279mm. Winds are generally light, averaging 3km/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 1034mm across the season with a monthly average of 345mm. Winds are generally light, averaging 4km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 802mm across the season with a monthly average of 267mm. Winds are generally light, averaging 3km/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 355mm across the season with a monthly average of 118mm. Winds are generally light, averaging 4km/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.
