For Zanzibar :
No gale warning.
The reliability of the situation is very good.
Very cloudy with risk of thunderstorms in the morning, sun and storm clouds in the afternoon. Showers all day. In the evening, skies with few clouds.
SE force 3 in the morning becoming ESE force 4 in the evening. Gusts reaching 17 knots in the evening. Slight sea. Low, short swell from ESE. Poor visibility becoming good in the middle of the day then excellent.