Outer bay
Dive site · Japan
Is it worth the trip?
66Good out of 100 for your dates
Best on Sun 8: Sea: flat, Visibility about 7 m, Water 21 °C
Mon 2 · 68 out of 100
- Sea
- 0.3 m
- Wind
- 1 kn
- Gusts
- 9kn
- Air
- 19°C
Tue 3 · 68 out of 100
- Sea
- 0.3 m
- Wind
- 7 kn
- Gusts
- 12kn
- Air
- 20°C
Wed 4 · 63 out of 100
- Sea
- 0.5 m
- Wind
- 12 kn
- Gusts
- 18kn
- Air
- 18°C
Thu 5 · 58 out of 100
- Sea
- 0.7 m
- Wind
- 3 kn
- Gusts
- 9kn
- Air
- 21°C
Fri 6 · 52 out of 100
- Sea
- 0.8 m
- Wind
- 0 kn
- Gusts
- 6kn
- Air
- 24°C
Sat 7 · 65 out of 100
- Sea
- 0.3 m
- Wind
- 11 kn
- Gusts
- 15kn
- Air
- 19°C
Sun 8 · 71 out of 100
- Sea
- 0.1 mflat
- Wind
- 4 kn
- Gusts
- 12kn
- Air
- 17°C
Tap a day for sea, wind and water. Full forecast
Forecast: next 10 days
Full forecast- Mon 268, good
- Tue 368, good
- Wed 463, good
- Thu 558, fair
- Fri 652, fair
- Sat 765, good
- Sun 871, good
- Mon 969, good
- Tue 1060, good
- Wed 1170, good
The site in five facts
- Down to 50 mits deepest
- From the shorehow you get in
- Open Waterand up
- Water 21 °C5 mm wetsuit
- Faces Wswell from there reaches it
Full forecast
every day, every number
The score doesn't know currents, the visibility on the day or your certification.
Suits Open Water divers and up, as a dive guide states it. Scored for Advanced divers.
| Day | Score | Sea | Wind | Gusts | Air |
|---|---|---|---|---|---|
| Mon 2Nov | 68, good | 0.3 m | 1 kn | 9kn | 19°C |
| Tue 3Nov | 68, good | 0.3 m | 7 kn | 12kn | 20°C |
| Wed 4Nov | 63, good | 0.5 m | 12 kn | 18kn | 18°C |
| Thu 5Nov | 58, fair | 0.7 m | 3 kn | 9kn | 21°C |
| Fri 6Nov | 52, fair | 0.8 m | 0 kn | 6kn | 24°C |
| Sat 7Nov | 65, good | 0.3 m | 11 kn | 15kn | 19°C |
| Sun 8Nov | 71, good | 0.1 mflat | 4 kn | 12kn | 17°C |
| Mon 9Nov | 69, good | 0.1 mflat | 10 kn | 17kn | 16°C |
| Tue 10Nov | 60, good | 0.2 mflat | 13 kn | 25kn | 11°C |
| Wed 11Nov | 70, good | – | 3 kn | 10kn | 17°C |
Sea is the waves near the site, in metres; wind and gusts in knots. "Boats in": gusts that keep dive boats in. More
Tide
- Mon 2 NovLow 04:30 −0.6 mHigh 12:36 +0.4 mLow 17:54 +0.1 mHigh 22:32 +0.2 m
- Tue 3 NovLow 05:59 −0.5 mHigh 13:37 +0.4 mLow 19:36 −0.1 m
- Wed 4 NovHigh 00:52 +0.2 mLow 07:22 −0.5 mHigh 14:21 +0.5 mLow 20:31 −0.3 m
Local clock times; heights about mean sea level. On open coasts the times are usually within a quarter of an hour; in bays, estuaries and on the Gulf of Mexico they can be an hour or more out. Slack water, the safest time to dive where there is current, is about half an hour either side of each high and low. Tide: EOT20 global ocean tide model, Hart-Davis et al. 2021, DGFI-TUM (doi:10.17882/79489), CC BY 4.0. Times and heights computed by us. A model, not a tide table: check a local table before you go.
Forecast updated . It refreshes every three hours. Forecast data: ECMWF, DWD, Météo-France and NOAA, served by Open-Meteo.com (CC BY 4.0). Changed by us. Generated using E.U. Copernicus Marine Service Information.
Map
the site and its town
Outer bay on Google Maps · Directions
Each place wears its best day on these dates: green good, amber fair, pale red poor, as the key says.
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One finger scrolls the page; two fingers move the map. Pins are our own positions. Map OpenFreeMap, © OpenMapTiles, data © OpenStreetMap contributors.
About
the place in full, sources, credits
About Outer bay
It goes down to 50 m. You get in from the shore. It suits Open Water divers and up, as a dive guide states it. The coast faces W: swell from the W reaches it, and wind from the E blows out to sea. 2 dive centres or shops within 10 km, the nearest 0.2 km away. The sea is about 16°C in January, its coldest month (7 mm wetsuit and hood), and 27°C in August, its warmest (3 mm wetsuit). The town to stay in is Heda. Within 5 km we also list 2 dive sites.
- What it is No source states what kind of site it is.
- How deep Down to 50 m: technical diving, past the 40 m recreational limit.
- Getting in From the shore.
- Who it suits Suits Open Water divers and up, as a dive guide states it.
- Dive centres 2 dive centres or shops within 10 km, the nearest 0.2 km away.
Water about 21°C: 5 mm wetsuit. Typical sea temperature for the time of year, not a forecast.
Visibility about 7 m. Typical for the time of year, estimated from ten years of NASA satellite water clarity, not a forecast. Clearest in Jan, Feb, May, Jun and Aug (about 15 m).
The score is the conditions only: the journey, the price and the partners never change it (how we score, how we earn).
Rough cost (estimate): about US$1,210–US$2,330 each
about US$1,210–US$2,330 each · 6 nights, 2 sharing: flights, hire car, stay, food.
Our estimate from typical public prices, not a quote: check the real prices before you book (where they come from). Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
How we worked it out
| What | How we worked it out | Each |
|---|---|---|
| Flights | return ORD to HND, estimated from distance and season, 3 airlines on the route, with a hold bag | about US$657–US$1,370 |
| Hire car | 6 days, shared | about US$107–US$174 |
| Stay | 6 nights, a mid-range double, shared | about US$208–US$348 |
| Food | 7 days eating out | about US$234–US$442 |
| Total | about US$1,210–US$2,330 |
Guided dives are not priced yet: we have no sourced price, so it is not in it. Prices from public sources, checked in 2026.
Where to stay: Heda
Ad Links marked Ad may pay us if you book. You pay the same, and they never change a score. How we earn
about 15 min by car · 30 places to stay
about US$80/nightcountry average
About Heda its beds, food and every spot near it
About US$80 a night is our estimate of the country's average 2-star double room that month: not each town's price, and not a quote. Drives are estimates. Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
Getting there: about 19h 30m
About 19h 30m door to door from Chicago
Fly ORD → HND, direct, then 2h 10m by road
Flights ORD → HND on your dates · AviasalesAdeSIM for your phone · Search on AiraloAd
An estimate, one way; the journey never changes the score.
In the water
Dives and courses in Heda · GetYourGuideDive gear hire in Heda · GetYourGuide
Dive centres nearby
Osper 0.2 km
平沢ダイビングショップ 7.2 km
静浦ダイビングセンター 10 km
Toi Diving Service 14 km
黄金崎ダイブセンター 21 km
The nearest named dive centres and shops within 25 km, in a straight line; training agencies where the map states them. Listings, not a recommendation. Dive centres: © OpenStreetMap contributors (ODbL). Credits
What you might see
Animals divers and surveys have recorded within 2 km of this site in the last 15 years. A record says someone saw it here, not that you will.
Myja hyotanNudibranch
Seen in 12 records, mostly Aug to Sep.
Records: OBIS (Ocean Biodiversity Information System, IOC-UNESCO), from the datasets named here, CC0 and CC BY records only. Names: WoRMS, through OBIS; common names from Wikidata. Largest datasets here: A photographically-vouchered global citizen science dataset of sea slugs (Mollusca: Heterobranchia) from the SEASLUG.WORLD platform since 2015; b74b429a-4052-4f5b-bff3-fe0b5a2e8669. Credits
This week's visibility and the current no free forecast gives. Ask a dive centre before you book.
Saved: this link opens the same trip
The link holds the trip itself: nothing about you is kept. Check the forecast again before you book.