CatchWindow fishing intelligence

Tokyo Bay, Japan Daily Water Report — October 6, 2026

Tokyo Bay is broadly suitable today, with sailing, boating and diving leading the card—but the northeast breeze has enough gust in it to keep the bay from feeling like a free pass. Forecast wind runs roughly 10 to 15 knots from the NE, with gusts near 21 knots around 13:00. That supports a solid 7.7/10 sailing outlook and 7.6/10 for boating, while kayakers get a workable but more exposed 6.8/10. The 0.4 to 0.6 m wave range is modest, with a representative 0.5 m at 10.25 seconds, but short 2-second wind waves can still add chop when the gusts arrive. The best practical window is early: dawn is 05:14, sunrise 05:40, and the calmest forecast wave height is 0.4 m near midnight, before the day’s strongest gusts build toward early afternoon. For anglers, the 07:45–09:45 solunar major period is the day’s most useful timing cue; fishing rates 5/10, held back relative to recent days by falling pressure and the breezier setup. A second major period runs 19:45–21:45, after sunset at 17:20, so it belongs to properly equipped night plans rather than an impulsive late cast. Diving is the standout at 8.4/10, matching yesterday’s score. Water is warm for the date at 23.7 C, about 1.5 C above average, and the low wave forecast is favorable. Still, that score is not a visibility guarantee: the reported 36.76 km is atmospheric visibility, not underwater clarity. Cloud cover is forecast at 100 percent, rain is not indicated, and the bay current is light at about 0.08 m/s toward 225 degrees. Compared with the recent run, boating is a touch below yesterday’s 7.7 and well below the exceptionally easy 9.4 on October 1; sailing also eases from 8.6 yesterday as gustiness increases. Water has warmed notably from yesterday’s 21.4 C while pressure has dropped from 1011 to 1005 hPa. Wednesday looks windier, though waves may ease to 0.2–0.5 m. Thursday onward is the calmer stretch, especially Friday’s 0.1–0.2 m waves and light 6.2-knot peak wind. Best bet: launch early, enjoy the manageable sea state, and be back with the dock lines snug before the afternoon NE gusts start showing off.