Climate Overview
The climate in Bontang is hot. The average annual temperature is 27°C and approximately 2303mm of precipitation falls per year. Bontang receives a notable amount of rainfall throughout the year, including during its driest month. Bontang sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Bontang has relatively stable temperatures year-round, staying within a 4°C range. The warmest month is May, when average highs reach 29°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 25°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows.
Precipitation
Bontang is a very wet location, receiving approximately 2303mm of precipitation annually, which averages out to around 192mm per month. The wettest month is December, averaging 245mm of rainfall. November and January also tend to see above-average precipitation. The driest month is August, with just 134mm. That's 110mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.
Wind
Bontang is mildly breezy, with an average annual wind speed of 15km/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 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Bontang, which began on March 20, 2026. Bontang 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 January near 25°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 609mm across the season with a monthly average of 203mm. Winds are generally light, averaging 14km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 499mm across the season with a monthly average of 166mm. Winds are moderate at around 15km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 556mm across the season with a monthly average of 185mm. Winds are moderate at around 15km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 29°C. Rainfall is heavy, totalling around 639mm across the season with a monthly average of 213mm. Winds are generally light, averaging 15km/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 Bontang 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.
