Weather in Semarang in August

Shoulder season. August sits in between. You will get good days and you will lose some. Highs average 33.9 °C, lows 23.1 °C, and rain falls on 5 days — nothing in the month is working against you.

August ranks 3 of 12 in Semarang. Only July scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 5 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 33.9 °C days and 23.1 °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: 11 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest August day reached 37.7 °C and the coldest night fell to 20.1 °C, and the wettest single day dropped 33 mm — roughly 110% of the month's rain in one day.

This is the volatile part. August rainfall has ranged from 0 mm to 132 mm across the twenty years measured — a 132 mm spread around an average of 30 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 8.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 66%.

How August sits in the year

Temperatures hold steady either side: 31.8 °C in July, 33.9 here, 35.4 in September. Nothing about the timing within the month matters much.

Daylight in August

Semarang sits close enough to the equator that daylight barely moves all year — 11.9 hours in August, against a range of just 0.8 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 28.5 °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 28.5 °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

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

August in Semarang versus nearby

If Semarang is one option among several, the nearby comparison is worth making. Jepara is a better bet in August — 3.9 °C cooler, the same number of rain days. Surabaya is a better bet in August — within a degree on temperature, 3 days less rain.

So: August is effectively as good as it gets here — 6 points behind July, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Semarang

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