Climate Overview
The climate in Sibolga is hot. The average annual temperature is 27°C and approximately 367mm of precipitation falls per year. December is the wettest month, receiving around 33mm of rainfall. Sibolga sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Sibolga has relatively stable temperatures year-round, staying within a 4°C range. The warmest month is June, when average highs reach 29°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 25°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.
Precipitation
Sibolga is a quite dry location, receiving approximately 367mm of precipitation annually, which averages out to around 31mm per month. The wettest month is January, averaging 33mm of rainfall. February and March also tend to see above-average precipitation. The driest month is June, with just 6mm. That's 26mm 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
Sibolga is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, 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 4km/h gap between the calmest and windiest months.
Seasons
22 days until Autumn
It is currently summer in Sibolga, which began on June 21, 2026. Sibolga sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in June at around 29°C, while the coldest stretch bottoms out in January near 25°C. Autumn is next, beginning on September 23, 2026 — 22 days from now.
Spring
Temperatures range from 26 to 28°C. Rainfall is relatively light, with around 98mm over the season and a monthly average of 33mm. Winds are generally light, averaging 7km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 26 to 29°C. Rainfall is relatively light, with around 72mm over the season and a monthly average of 24mm. Winds are generally light, averaging 8km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 28°C. Rainfall is relatively light, with around 98mm over the season and a monthly average of 33mm. Winds are generally light, averaging 6km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 25 to 27°C. Rainfall is relatively light, with around 98mm over the season and a monthly average of 33mm. Winds are generally light, averaging 8km/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 Sibolga 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.
