Climate Overview
The climate in Jombang is hot. The average annual temperature is 27°C and approximately 1867mm of precipitation falls per year. February is the wettest month, receiving around 324mm of rainfall. Jombang sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Jombang sees moderate temperature variation throughout the year, ranging from 22°C to 33°C. The warmest month is October, when average highs reach 33°C and the mean temperature sits around 28°C. July is the coolest month, with minimum temperatures around 22°C and an average of 26°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs.
Precipitation
Jombang is a fairly wet location, receiving approximately 1867mm of precipitation annually, which averages out to around 156mm per month. The wettest month is February, averaging 324mm of rainfall. March and January also tend to see above-average precipitation. The driest month is August, with just 16mm. That's 307mm 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
Jombang 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 January, averaging 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.
Seasons
89 days until Winter
It is currently autumn in Jombang, which began on March 20, 2026. Jombang 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 33°C, while the coldest stretch bottoms out in July near 22°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 23 to 33°C. Rainfall is heavy, totalling around 321mm across the season with a monthly average of 107mm. Winds are generally light, averaging 9km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 854mm across the season with a monthly average of 285mm. Winds are generally light, averaging 9km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 580mm across the season with a monthly average of 193mm. Winds are generally light, averaging 7km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 22 to 32°C. Rainfall is relatively light, with around 112mm over the season and a monthly average of 37mm. 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 Jombang 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.
