CatchWindow fishing intelligence

Callao, Peru Daily Water Report — October 4, 2026

Callao is a qualified go for boating, kayaking and diving today, with the best odds before the afternoon gusts start throwing their weight around. Boating leads the activity ratings at 6.9/10, kayaking follows at 6.5, and diving is the standout at 7.8. Those are useful planning signals, not safety clearances: a harbor can be forgiving right up until it isn’t. Early morning is the cleanest practical window. Winds run light overall, from 3.8 to 9.8 knots, with a representative southeast breeze near 5 knots, while the 1.2–1.6 m sea is at its calmest near midnight and builds through the day. The dominant swell is substantial enough to matter at 1.42 m and 11.4 seconds from 217°, even though locally generated wind waves are only 0.34 m. In other words, the breeze may look civilized while the longer-period water still asks for attention. For anglers, the stronger timing is around the 06:03–08:03 solunar major period, close to sunrise at 05:51. Fishing rates a middling 5.4/10, down from 7/10 in the reconstructed October 3 assessment, despite stable pressure near 1013 hPa and no rain indicated. The evening major period, 18:03–20:03, overlaps sunset, but conditions should be judged afresh after the day’s wind. No tide data are available, so do not build a plan around a presumed tide turn. The principal tradeoff arrives around 13:00, when gusts are forecast to reach 27.2 knots. That is a very different proposition from the day’s representative 5-knot wind and is reason to keep small craft plans conservative, especially with 1.6 m waves possible. Air temperatures reach 25.9 C, sea-surface temperature is about 23–23.4 C, and atmospheric visibility is forecast near 19.8 km; that visibility figure does not describe underwater clarity. Compared with recent CatchWindow estimates, diving holds at the top end of its recent range, while boating and fishing ease from yesterday’s stronger scores. Monday through Wednesday stay dry and warm but seas rise to roughly 1.8–1.9 m before easing later in the week. Best bet: launch early, use the sunrise solunar window, and be back inside before the afternoon gusts decide they own the harbor.