Weather in Batam

On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are December, January, and February. Batam is in Indonesia at 1.1°N. The 2001–2020 NASA POWER daily record describes an equatorial climate that stays hot and wet.

May is the warmest month (average 28.8°C, high 29.8°C) and January is the coolest (average 26.9°C, low 25.5°C). Rain is rain in every month and about 2391 mm across the year. The wettest month is December at 302 mm; the driest is February at 109 mm.

When the score favours a visit

The three months with the highest comfort score are December, January, and February: December (27.2°C average, 302 mm, 85% humidity); January (26.9°C average, 236 mm, 85% humidity); February (27.2°C average, 109 mm, 83% humidity). Those months sit across the year end, so they are listed in season order rather than January-to-December. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you prefer the hottest stretch, that is May. The coolest stretch is January.

Hot and cool months in Batam

Monthly average highs run from 28.3°C in January to 29.8°C in May. Nights follow the same curve: 25.5°C in January and 27.9°C in May.

Across the year the mean afternoon high is 29.1°C. If you want the smallest day–night shock, look at months where the high and low sit close together; May nights still hold 27.9°C.

Rain through the year

Rain does not take a season off. Batam receives about 2391 mm a year, and even February still sees 109 mm. December is the peak at 302 mm and 28 days with at least 1 mm.

Humidity peaks near 85%. That usually lines up with the wetter months rather than the hottest ones.

What stands out month by month

The year bottoms out in January. Plan for 25.5°C at night and 28.3°C in the afternoon. February is the driest month, averaging only 109 mm across 14 rainy days. Highs sit near 28.9°C. March: 29.4°C high, 26.3°C low, 177 mm rain, 81% humidity.

Peak heat arrives in May: 29.8°C by day, 27.9°C at night, and 80% humidity. In November, Batam averages 28.6°C by day and 26.7°C at night, with 294 mm of rain. December is the wettest month — 302 mm and 28 rainy days, with 85% humidity.

Batam and other cities in Indonesia

Palembang is about 459 km away: Batam is 1.8°C warmer than Palembang in its hottest month and 59 mm drier over the year than Palembang. Palembang’s wettest month is March (313 mm) versus December here.

Medan is about 654 km away: Batam is 1.9°C warmer than Medan in its hottest month and 114 mm wetter over the year than Medan. Medan’s wettest month is October (310 mm) versus December here.

Jakarta is about 877 km away: Batam is 0.5°C warmer than Jakarta in its hottest month and 189 mm wetter over the year than Jakarta. Jakarta’s wettest month is February (387 mm) versus December here.