Weather in Zanzibar in April

Shoulder season. April is shoulder season in Zanzibar — cheaper, quieter, and a genuine gamble. You should expect rain on 26 days of the month, which is more days wet than dry.

April ranks 10 of 12 — near the bottom of Zanzibar's year. July is the month that works, and the swing between the two is 42 points, which is a different holiday rather than a slightly better one.

Rain on 26 of the month's 30 days, 8 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. Pack for 29.2 °C days and 27.2 °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: 7 days top 30 °C — hot spells arrive, but they break; the day barely swings — 2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest April day reached 31.8 °C and the coldest night fell to 25.2 °C, and the wettest single day dropped 130 mm — roughly 51% of the month's rain in one day.

April is moderately variable: 55 mm in the driest year against 499 mm in the wettest, around an average of 256 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 15.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How April sits in the year

Temperatures hold steady either side: 29.9 °C in March, 29.2 here, 28.4 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

Zanzibar sits close enough to the equator that daylight barely moves all year — 12 hours in April, against a range of just 0.7 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 29.3 °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

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

April in Zanzibar versus nearby

If Zanzibar is one option among several, the nearby comparison is worth making. Dar es Salaam is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Mombasa is the weaker option in April — 3.2 °C warmer, 2 days less rain.

So: April is a compromise. July is 39 points better and is what Zanzibar 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 Zanzibar

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