Climate Overview
The climate in Sumbawa Besar is hot. The average annual temperature is 27°C and approximately 1617mm of precipitation falls per year. January is the wettest month, receiving around 368mm of rainfall. Sumbawa Besar sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Sumbawa Besar has relatively stable temperatures year-round, staying within a 9°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 23°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Sumbawa Besar is a fairly wet location, receiving approximately 1617mm of precipitation annually, which averages out to around 135mm per month. The wettest month is January, averaging 368mm of rainfall. February and December also tend to see above-average precipitation. The driest month is August, with just 3mm. That's 365mm less than January, 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
Sumbawa Besar is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/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 10km/h in winter, 7km/h in spring, 7km/h in summer, 7km/h in autumn.
Seasons
3 days until Spring
It is currently winter in Sumbawa Besar, which began on June 21, 2026. Sumbawa Besar 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 23°C. Spring is next, beginning on September 23, 2026 (3 days from now).
Spring
Temperatures range from 23 to 32°C. Precipitation is moderate at around 195mm for the season, averaging 65mm per month. Winds are generally light, averaging 7km/h. Light layers work well as temperatures warm through the season. It is a great time to be outdoors.
Summer
Temperatures range from 24 to 30°C. Rainfall is heavy, totalling around 996mm across the season with a monthly average of 332mm. Winds are generally light, averaging 7km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 31°C. Rainfall is heavy, totalling around 390mm across the season with a monthly average of 130mm. Winds are generally light, averaging 7km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 23 to 31°C. Precipitation is minimal, with only around 36mm for the entire season. Winds are generally light, averaging 10km/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 Sumbawa Besar 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.
