Climate Insights for Serang

The climate in Serang is warm and mild. The average annual temperature is 22°C and approximately 155mm of precipitation falls per year. June is the wettest month, receiving around 33mm of rainfall. Serang sits near the equator, so seasonal temperature differences are minimal throughout the year.

Serang has a wide annual temperature range, spanning 36°C from the coldest to warmest months. July is the hottest month, with daytime highs reaching 37°C and an average of 31°C. September is the coolest month, with minimum temperatures around 1°C and an average of 8°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 21°C shift in average temperatures.

Serang is a quite dry location, receiving approximately 155mm of precipitation annually, which averages out to around 13mm per month. The wettest month is May, averaging 33mm of rainfall. June and December also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 33mm less than May, 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.

Serang is relatively calm, with an average annual wind speed of 4km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, 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 6km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently winter in Serang, which began on June 21, 2026. Serang sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in July at around 37°C, while the coldest stretch bottoms out in September near 1°C. Spring is next, beginning on September 23, 2026 — 23 days from now.

The best time to visit Serang is during January, February, April, May, June and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 17mm per month. By contrast, July can be uncomfortably hot with highs reaching 37°C, while September is the coldest period with lows dropping to 1°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Serang 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.