In Zanzibar there are two mainly windy seasons
December - March
During the European winter season, the Kaskasi blows as a steady NE, which is SIDE-ON,14 kts to 20 kts
June - October
The Kuzi is stronger than the Kaskasi, it comes from SE and it is also SIDE-ON.
14kts to 25 kts
The wind direction is always safe.