Weather in Zanzibar in January

A good month. January is a solid month to be in Zanzibar. Highs average 29.5 °C, lows 27 °C, and rain falls on 12 days — nothing in the month is working against you.

January ranks 7 of 12 in Zanzibar: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 12 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.5 °C days and 27 °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: 8 days top 30 °C — hot spells arrive, but they break; the day barely swings — 2.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest January day reached 31.2 °C and the coldest night fell to 25.5 °C, and the wettest single day dropped 27 mm — roughly 44% of the month's rain in one day.

January is moderately variable: 18 mm in the driest year against 174 mm in the wettest, around an average of 62 mm. Roughly two Januarys in three land near that average, and the third does something else entirely.

Wind sits around 18.5 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 77%, high enough to notice on the warm days without dominating them.

How January sits in the year

Temperatures hold steady either side: 29.7 °C in December, 29.5 here, 29.8 in February. Nothing about the timing within the month matters much. Rain has already shifted: 7 days fewer than December had.

Daylight in January

Zanzibar sits close enough to the equator that daylight barely moves all year — 12.4 hours in January, 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 28.6 °C in January — warm enough that the water offers no relief from the heat. The sea peaks at 29.5 °C in March and bottoms out at 25.6 °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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

January in Zanzibar versus nearby

If Zanzibar is one option among several, the nearby comparison is worth making. Dar es Salaam is the weaker option in January — within a degree on temperature, 4 days more rain. Mombasa is the weaker option in January — 6.3 °C warmer, 6 days less rain.

So: January is a compromise. July is 26 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 January.