The Eastern Coast of Africa has two seasonal winds. The South-East Trade (Kusi) which blows from May to November, a strong gusty wind which brings the rains, rough water and silt from the Tana River. During this time most boat movement takes place along inshore channels. The North-East Trade (Kas Kazi) blows from December to April. This summer wind brings calm, clear water and the fishing season. Occasionally there are strong winds, but storms are rare.
There are two Low and High tides daily, with 12 hours between each. The cycle is about one hour later each day. The difference between High and Low tides vary with the moon. Spring Tide occurs every two weeks on the Full and New moons. During spring tides the current is strong in front of Peponi. Neap Tide occurs on both half moons and has minimal difference between High and Low tide. Since the movement is so little, the water tends to be at its clearest over the Neap Tides.