Climate Overview
The climate in Lasem is hot. The average annual temperature is 28°C and approximately 1819mm of precipitation falls per year. February is the wettest month, receiving around 292mm of rainfall. Lasem sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Lasem has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is October, when average highs reach 31°C and the mean temperature sits around 28°C. August is the coolest month, with minimum temperatures around 25°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.
Precipitation
Lasem is a fairly wet location, receiving approximately 1819mm of precipitation annually, which averages out to around 152mm per month. The wettest month is February, averaging 292mm of rainfall. January and December also tend to see above-average precipitation. The driest month is August, with just 12mm. That's 280mm 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
Lasem is mildly breezy, with an average annual wind speed of 16km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 19km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months.
Seasons
89 days until Winter
It is currently autumn in Lasem, which began on March 20, 2026. Lasem 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 25°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 25 to 31°C. Rainfall is heavy, totalling around 354mm across the season with a monthly average of 118mm. Winds are moderate at around 16km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 30°C. Rainfall is heavy, totalling around 814mm across the season with a monthly average of 271mm. Winds are moderate at around 18km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 30°C. Rainfall is heavy, totalling around 533mm across the season with a monthly average of 178mm. Winds are generally light, averaging 14km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 30°C. Rainfall is relatively light, with around 117mm over the season and a monthly average of 39mm. Winds are moderate at around 17km/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 Lasem 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.
