Weather in Mombasa in May

A hard month. May 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.

May ranks 8 of 12 in Mombasa: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 23 of the month's 31 days, 7 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 82% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 18 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest May day reached 35.5 °C and the coldest night fell to 20.4 °C, and the wettest single day dropped 88 mm — roughly 41% of the month's rain in one day.

May is moderately variable: 20 mm in the driest year against 524 mm in the wettest, around an average of 217 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 13.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 32.4 °C in April, 30.5 here, 29.7 in June. Nothing about the timing within the month matters much. Rain is the thing that moves: June brings 10 days less of it, so pushing the dates later buys drier weather.

Daylight in May

Mombasa sits close enough to the equator that daylight barely moves all year — 11.9 hours in May, against a range of just 0.5 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 28.3 °C in May — 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.

May in Mombasa versus nearby

If Mombasa is one option among several, the nearby comparison is worth making. Zanzibar is a better bet in May — 2.1 °C cooler, 3 days less rain. Dar es Salaam is a better bet in May — within a degree on temperature, 6 days less rain.

So: May is a compromise. July is 28 points better and is what Mombasa 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 Mombasa

See all twelve months in Mombasa, or where else to go in May.