The early high tide at Guapimirim comes in just after five in the morning, barely reaching half a metre, and the evening high around six is only slightly higher at 0.8 metres. The low tides are equally gentle, with the first drop to 0.6 metres before three in the morning and a slightly lower ebb to 0.5 metres around nine o'clock. It is one of those quiet days where the sea barely breathes, the tidal range so small that the water seems to hover rather than surge.

For anyone heading to the beach, the morning low at nine o'clock will pull the water back just enough to expose some wet sand, perfect for a stroll or a quick dip before the tide inches up again. Swimmers will find the currents mild all day, but the slack water around the late-morning and early-afternoon windows is especially forgiving. Small boats and fishing folk should note that the outgoing tide around nine offers a gentle push out, while the incoming around six in the evening brings a slight rise but nothing that would trouble a dinghy.

The real caution today is less about the tide and more about the light, with sunrise at half past six and sunset just after five in the afternoon. That means the best beach hours fall squarely in the middle of the day, from late morning to mid-afternoon, when the sun is up and the water is at its calmest. If you are fishing from the shore, aim for the hour after the nine o'clock low, when the water starts to creep back and the fish often follow.

So wrap up your day by the time the sun sets at 5:21, because the evening high tide at 18:22 will be barely noticeable in the dark. The takeaway is simple: today is a beach day, not a tide-watcher's day. Enjoy the shallow, steady sea from mid-morning to around three, and leave the currents to their quiet rhythm.