Weather in Semarang in March

A hard month. March is a hard month in Semarang, and worth planning around. You should expect rain on 26 days of the month, which is more days wet than dry.

March ranks 6 of 12 in Semarang: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 26 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 85% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 14 days top 30 °C — hot spells arrive, but they break; the day barely swings — 4.7 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest March day reached 32.9 °C and the coldest night fell to 23 °C, and the wettest single day dropped 79 mm — roughly 39% of the month's rain in one day.

March is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest March on record still delivered 380 mm against 92 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 204 mm average is a reasonable planning figure, not a promise.

Wind is light at 6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 85% is the real story though — it is the number that decides how the day feels, not the 29.8 °C.

How March sits in the year

Temperatures hold steady either side: 29.3 °C in February, 29.8 here, 30.3 in April. Nothing about the timing within the month matters much.

Daylight in March

Semarang sits close enough to the equator that daylight barely moves all year — 12.2 hours in March, 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 29.1 °C in March — 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

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.

March in Semarang versus nearby

If Semarang is one option among several, the nearby comparison is worth making. Jepara is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Surabaya is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: March works, with July the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Semarang

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