For Zanzibar :
No gale warning.
The reliability of the situation is very good.
Skies very cloudy, risk of thundery outbreaks during the afternoon. Light showers all day. In the evening, skies with few clouds.
S force 2 turning SE force 3 in the middle of the day then ESE. Gusts reaching 13 knots in the evening. Slight sea. Low, short swell from ESE. Good visibility becoming excellent in the middle of the day then poor.