SailCall

Should you sail in Tokyo Bay?

CAUTION — Sail only if you are experienced and prepared. Sailing score 69/100 · Japan. Poor visibility likely. Marine data unavailable. Best window starts around Today 8:00 PM.

About sailing in Tokyo Bay

Tokyo Bay is a vast enclosed waterway framed by Yokohama, Chiba, and the Miura Peninsula — busy but rewarding urban sailing.

Best time to sail

April through October; avoid typhoon season peak August–September without close weather monitoring.

Sailing notes

Heavy commercial shipping and restricted zones; typhoon tracks demand flexible plans in summer.

Wind and local conditions

Thermal sea breezes in summer afternoons; winter brings northerly winds and clearer visibility.

What SailCall covers

Wind, seas, rain, visibility, and pressure for today's coastal day sail, using WeatherAPI.com forecast and marine data. Wave outlook is included; tide times are not yet — check a local tide table before harbor entry. Not a chart plotter or passage planner.

Should I go sailing today?

Tokyo Bay

CAUTION

Sail only if you are experienced and prepared

69

Sailing score

Next 24 hours

Hourly sailing comfort at the harbor — today and tomorrow are local to the marina.

Best intervals: Today 8:00 PM – 11:00 PM

Boat type

Showing Keelboat wind thresholds

Tomorrow
NowTmr 2amTmr 8amTmr 2pmTmr 8pm
GoodFairPoor

Hover or tap an hour for details · Next 24 hours

Best window starts around Today 8:00 PM

At harbor: Sat, Jul 4, 8:00 PM (Japan Standard Time)

The call

You could sail near Tokyo Bay today, but poor visibility likely.

Location

Tokyo Bay, Japan

35.4467°, 139.6425°Open in OpenStreetMap

Today's seas

No marine wave data for this point. Try searching closer to open water or a coastal waypoint. Offshore forecasts need a sea position, not an inland pin.

Conditions at a glance

What stood out in the forecast

Wind

Good

4 kt · BF 2

Sustained to 4 kt · gusts to 19 kt · BF 5

Beaufort 5 — a workable breeze for most day sails. Watch for funneling between headlands and tall buildings near harbors; local gusts can exceed the open-water forecast.

Rain

Fair

67%

2.6 mm total · 67% peak chance · 4 wet hour(s)

Showers possible across 4 hour(s). Light rain is manageable with good gear; heavy bursts can obscure marks and other traffic — keep a hand on the plotter or chart.

Air temperature

Good

26°C

Air 21–26°C · feels like 21–30°C

Comfortable air temperatures for deck work, but water temperature may still be much colder — a dip without proper gear can shock even on a warm day.

Visibility

Poor

1.0 nm

Lowest 1.0 nm · best 12 nm today

Sight distance down to about 1.0 nm — treat it like restricted visibility: slower speed, extra lookouts, sound signals where rules require, and AIS/radar if fitted. Ferry lanes and busy harbors deserve extra margin.

Barometric pressure

Good

1012 hPa

1012 hPa → steady

Pressure is steady — no strong synoptic system pushing through on this snapshot. Local wind, sea breeze, and geography still dominate near shore.

UV / sun

Good

UV 5.7

Moderate index — standard protection recommended. · peak near 12:00

Lower UV today, but reflection off water still adds exposure. Sunglasses and SPF remain cheap insurance on the water.

Why we said CAUTION

What pushed the score — how we score

  • Poor visibility likely

    High

    Visibility down to 1.0 nm — navigation and comfort suffer.

  • Marine data unavailable

    High

    Wave forecast could not be loaded for this point. Try a location closer to open water.

How we decided

We score sailing conditions with fixed thresholds, so you can see why we picked go, caution, or no-go. Official charts, tide books, and your own judgment still run the show.

  • GO — sailing score ≥70 with no critical blockers
  • CAUTION — score 45–69, or manageable risks
  • NO-GO — score <45 or dangerous wind/seas/storms

Engine v1.1.19 · open_meteo marine + forecast · Evaluated Sat, Jul 4, 8:59 PM (Japan Standard Time) · limited marine data

What should I do?

What to do next

  • Best window starts around Today 8:00 PM

    Conditions should improve around Today 8:00 PM (Japan Standard Time) — consider delaying departure until then.

    At harbor: Sat, Jul 4, 8:00 PM (Japan Standard Time)

  • Reduce speed and watch for traffic

    Low visibility makes collisions and navigation errors more likely — use radar and AIS if equipped.

  • Consider a sheltered route

    Stay inside the bay or in the lee of the land if you go out.

Day outlook

2-day · °C, kt, m, nm, mm

Today

Poor

26°C / 21°C

2.6 mm · 67%

Not ideal: rain expected (remaining hours).

Tomorrow

Poor

23°C / 22°C

13.4 mm · 99%

Not ideal: heavy rain likely.

Forecast data from third-party providers.