Weather in Semarang in April

A hard month. April asks something of you. Go in knowing what. You should expect rain on 23 days of the month, which is more days wet than dry.

April ranks 10 of 12 — near the bottom of Semarang's year. July is the month that works, and the swing between the two is 30 points, which is a different holiday rather than a slightly better one.

Rain on 23 of the month's 30 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: 19 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 April day reached 32.7 °C and the coldest night fell to 22.4 °C, and the wettest single day dropped 62 mm — roughly 33% of the month's rain in one day.

April is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest April on record still delivered 293 mm against 82 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 187 mm average is a reasonable planning figure, not a promise.

Wind is light at 5.3 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 30.3 °C.

How April sits in the year

Temperatures hold steady either side: 29.8 °C in March, 30.3 here, 30.4 in May. Nothing about the timing within the month matters much. Rain is the thing that moves: May brings 6 days less of it, so pushing the dates later buys drier weather.

Daylight in April

Semarang sits close enough to the equator that daylight barely moves all year — 12 hours in April, 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 29.8 °C in April — 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.

April in Semarang versus nearby

If Semarang is one option among several, the nearby comparison is worth making. Jepara is a better bet in April — within a degree on temperature, 3 days more rain. Surabaya is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: April is a compromise. July is 20 points better and is what Semarang 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 Semarang

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