Climate Overview
The climate in Banjarmasin is hot. The average annual temperature is 28°C and approximately 2426mm of precipitation falls per year. Banjarmasin receives a notable amount of rainfall throughout the year, including during its driest month. Banjarmasin sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Banjarmasin 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 28°C. August 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 7°C between highs and lows.
Precipitation
Banjarmasin is a very wet location, receiving approximately 2426mm of precipitation annually, which averages out to around 202mm per month. The wettest month is March, averaging 328mm of rainfall. December and January also tend to see above-average precipitation. The driest month is August, with just 59mm. That's 270mm less than March, 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
Banjarmasin is relatively calm, with an average annual wind speed of 11km/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 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.
Seasons
90 days until Winter
It is currently autumn in Banjarmasin, which began on March 20, 2026. Banjarmasin 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 August near 24°C. Winter is next, beginning on June 21, 2026 — 90 days from now.
Spring
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 499mm across the season with a monthly average of 166mm. Winds are generally light, averaging 12km/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 916mm across the season with a monthly average of 305mm. Winds are generally light, averaging 11km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 32°C. Rainfall is heavy, totalling around 732mm across the season with a monthly average of 244mm. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 32°C. Precipitation is moderate at around 280mm for the season, averaging 93mm per month. Winds are generally light, averaging 12km/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 Banjarmasin 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.
