Weather in Medan in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 25 days of the month, which is more days wet than dry.

Medan barely has seasons. August scores 47 out of 100 against a best of 54 in February — a gap small enough that the month you choose matters far less here than the week you choose.

Rain on 25 of the month's 31 days, 6 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 84% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 18 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest August day reached 33.2 °C and the coldest night fell to 21.2 °C, and the wettest single day dropped 68 mm — roughly 34% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 388 mm against 71 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 199 mm average is a reasonable planning figure, not a promise.

Wind is light at 3.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 30.2 °C in July, 30.2 here, 29.9 in September. Nothing about the timing within the month matters much.

Daylight in August

Medan sits close enough to the equator that daylight barely moves all year — 12.2 hours in August, against a range of just 0.4 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 30 °C in August — warm enough that the water offers no relief from the heat. The sea peaks at 30.4 °C in May and bottoms out at 28.8 °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

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

August in Medan versus nearby

If Medan is one option among several, the nearby comparison is worth making. Ipoh is close enough to be a coin toss — within a degree on temperature, 3 days less rain. Kota Kuala Muda is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: August works, with February the better month by 7 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Medan

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