CatchWindow fishing intelligence

Tokyo Bay, Japan Daily Water Report — October 7, 2026

Tokyo Bay is broadly well suited to getting afloat, with boating the clear pick at 8.7/10 and sailing, kayaking, and diving all solidly favorable. This is a manageable harbor-water day rather than a glass-calm one: representative east wind is 8 knots, but gusts reach 20 knots around 07:00 and the day’s wind range stretches to 17 knots. Give the early launch its due respect, especially in smaller craft. The water itself is modest, with waves around 0.26 m at 6.25 seconds, a 0.18 m swell from 157°, and short wind waves near 0.14 m. Forecast seas range from 0.2 to 0.5 m, easing to the day’s calmest 0.2 m near 22:00. That favors protected boating and a sensible paddle once the gustier morning period has passed, while sailors should find enough breeze to work with without needing a full-weather expedition. The light current forecast, about 0.08 m/s toward 225°, is not a headline-maker, but it still belongs in route and return planning. For anglers, the 5.8/10 score is middling rather than miserable. The stronger opportunity windows are the 07:45–09:45 solunar major period and the 14:15–15:15 minor period, with a second major period after dark from 19:45–21:45. Pressure is rising from a low near 1007 hPa toward 1021 hPa, and no rain is indicated; neither fact turns the fishing score into a guarantee. Tide data are unavailable, so timing should not be treated as a tide substitute. Diving rates 7.6/10 in 22.5 C marine water, helped by the small sea state, though the reported 42 km atmospheric visibility says nothing about underwater visibility. Air stays near 20–22 C under partial cloud, so surface intervals may feel cooler than the water suggests. Compared with the recent run, boating improves from yesterday’s 7.6, while diving eases from 8.4 and sailing is nearly unchanged. Looking ahead, October 8–9 appear notably quieter, with 0.1–0.2 m waves and peak winds near 11 and 9 knots; October 13 looks quieter still. Best bet: launch after the morning gust peak, use the late-morning harbor lull for boating or paddling, and let the bay keep its small-but-sharp edges.