Climate Insights for Sumbawa Besar

The climate in Sumbawa Besar is hot. The average annual temperature is 26°C and approximately 1583mm of precipitation falls per year. January is the wettest month, receiving around 315mm of rainfall. Sumbawa Besar sits near the equator, so seasonal temperature differences are minimal throughout the year.

Sumbawa Besar has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is October, when average highs reach 31°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 22°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.

Sumbawa Besar is a fairly wet location, receiving approximately 1583mm of precipitation annually, which averages out to around 132mm per month. The wettest month is January, averaging 315mm of rainfall. February and December also tend to see above-average precipitation. The driest month is August, with just 17mm. That's 298mm 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.

Sumbawa Besar is relatively calm, with an average annual wind speed of 2km/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 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 1km/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.

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 31°C, while the coldest stretch bottoms out in August near 22°C. Spring is next, beginning on September 23, 2026 — 89 days from now.

The best time to visit Sumbawa Besar is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 25°C with modest rainfall averaging 32mm per month. By contrast, October can be uncomfortably hot with highs reaching 31°C, while August is the coldest period with lows dropping to 22°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

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.