Climate Overview
The climate in Sumbawa Besar is hot. The average annual temperature is 26°C and approximately 1953mm of precipitation falls per year. February is the wettest month, receiving around 420mm 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 10°C range. The warmest month is October, when average highs reach 31°C and the mean temperature sits around 27°C. July is the coolest month, with minimum temperatures around 21°C and an average of 25°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 1953mm of precipitation annually, which averages out to around 163mm per month. The wettest month is February, averaging 420mm of rainfall. January and March also tend to see above-average precipitation. The driest month is August, with just 4mm. That's 417mm less than February, 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 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 8km/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 Winter
It is currently autumn in Sumbawa Besar, which began on March 20, 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 31°C, while the coldest stretch bottoms out in July near 21°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 22 to 31°C. Precipitation is moderate at around 240mm for the season, averaging 80mm per month. Winds are generally light, averaging 10km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 29°C. Rainfall is heavy, totalling around 1134mm across the season with a monthly average of 378mm. Winds are generally light, averaging 10km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 30°C. Rainfall is heavy, totalling around 536mm across the season with a monthly average of 179mm. Winds are generally light, averaging 9km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 30°C. Precipitation is minimal, with only around 44mm 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.
Best Time to Visit
The best time to visit Sumbawa Besar is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 25°C with modest rainfall averaging 8mm per month. By contrast, October can be uncomfortably hot with temperatures reaching 31°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
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.
