Weather in Jakarta in August

A good month. August is a solid month to be in Jakarta. Highs average 29.6 °C, lows 24.4 °C, and rain falls on 10 days — nothing in the month is working against you.

August is the highest-scoring month of the twelve. The nearest rival is July, and the month at the other end of the year is October.

Rain on 10 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.6 °C days and 24.4 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 days top 30 °C — hot spells arrive, but they break; the day barely swings — 5.2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 32 °C and the coldest night fell to 21.9 °C, and the wettest single day dropped 39 mm — roughly 80% of the month's rain in one day.

This is the volatile part. August rainfall has ranged from 3 mm to 197 mm across the twenty years measured — a 194 mm spread around an average of 49 mm. The average is real but almost no individual August looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 9.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 29.2 °C in July, 29.6 here, 30.5 in September. Nothing about the timing within the month matters much. Rain has already shifted: 5 days fewer than July had.

Daylight in August

Jakarta sits close enough to the equator that daylight barely moves all year — 11.9 hours in August, against a range of just 0.7 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 28.7 °C in August — warm enough that the water offers no relief from the heat. The sea peaks at 29.9 °C in May and bottoms out at 28.6 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, September is the trade worth considering — 9 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Jakarta versus nearby

If Jakarta is one option among several, the nearby comparison is worth making. Bandung is close enough to be a coin toss — 2.4 °C cooler, 2 days less rain. Bandar Lampung is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: August is the answer for Jakarta. If it is booked out or priced out, July is the next best thing at 9 points behind, and October is the month to keep off the shortlist.

Every month in Jakarta

See all twelve months in Jakarta, or where else to go in August.