Weather in Surabaya in March

Shoulder season. March is shoulder season in Surabaya — cheaper, quieter, and a genuine gamble. You should expect rain on 28 days of the month, which is more days wet than dry.

March ranks 8 of 12 in Surabaya: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 28 of the month's 31 days, 10 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: 7 days top 30 °C — hot spells arrive, but they break; the day barely swings — 3.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest March day reached 31.6 °C and the coldest night fell to 24.1 °C, and the wettest single day dropped 55 mm — roughly 20% 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 420 mm against 151 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 272 mm average is a reasonable planning figure, not a promise.

Wind is light at 8.5 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 March sits in the year

Temperatures hold steady either side: 28.8 °C in February, 29.2 here, 29.8 in April. Nothing about the timing within the month matters much.

Daylight in March

Surabaya 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. This is the warmest the water gets all year.

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 Surabaya versus nearby

If Surabaya 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, the same number of rain days. Semarang is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: March is a compromise. August is 22 points better and is what Surabaya is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Surabaya

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