Experienced divers only
Is it worth the trip?
64Good out of 100 for your dates
2 days tie for best
Tue 3 · 66 out of 100
- Sea
- 0.5 m
- Wind
- 5 kn
- Gusts
- 8kn
- Air
- 17°C
Wed 4 · 66 out of 100
- Sea
- 0.5 m
- Wind
- 4 kn
- Gusts
- 6kn
- Air
- 18°C
Thu 5 · 63 out of 100
- Sea
- 0.9 m
- Wind
- 9 kn
- Gusts
- 11kn
- Air
- 18°C
Fri 6 · 57 out of 100
- Sea
- 1.4 m
- Wind
- 14 kn
- Gusts
- 17kn
- Air
- 19°C
Sat 7 · 63 out of 100
- Sea
- 1.2 m
- Wind
- 5 kn
- Gusts
- 16kn
- Air
- 17°C
Sun 8 · 64 out of 100
- Sea
- 1.0 m
- Wind
- 3 kn
- Gusts
- 13kn
- Air
- 13°C
Mon 9 · 63 out of 100
- Sea
- 0.9 m
- Wind
- 8 kn
- Gusts
- 12kn
- Air
- 15°C
Tap a day for sea, wind and water. Full forecast
Forecast: next 9 days
Full forecast- Mon 265, good
- Tue 366, good
- Wed 466, good
- Thu 563, good
- Fri 657, fair
- Sat 763, good
- Sun 864, good
- Mon 963, good
- Tue 103, poor
The site in five facts
- Down to 27 mits deepest
- From a boathow you get in
- Experienced / deepexperienced divers only
- Water 15 °C7 mm semi-dry or a drysuit
- Best May–Aug7 good days in 7
Full forecast
every day, every number
The score doesn't know currents, the visibility on the day or your certification.
Suits experienced divers only, as a dive guide states it. Scored for experienced divers.
| Day | Score | Sea | Wind | Gusts | Air |
|---|---|---|---|---|---|
| Mon 2Nov | 65, good | 0.5 m | 5 kn | 9kn | 15°C |
| Tue 3Nov | 66, good | 0.5 m | 5 kn | 8kn | 17°C |
| Wed 4Nov | 66, good | 0.5 m | 4 kn | 6kn | 18°C |
| Thu 5Nov | 63, good | 0.9 m | 9 kn | 11kn | 18°C |
| Fri 6Nov | 57, fair | 1.4 m | 14 kn | 17kn | 19°C |
| Sat 7Nov | 63, good | 1.2 m | 5 kn | 16kn | 17°C |
| Sun 8Nov | 64, good | 1.0 m | 3 kn | 13kn | 13°C |
| Mon 9Nov | 63, good | 0.9 m | 8 kn | 12kn | 15°C |
| Tue 10Nov | 3, poor | 2.3 m | 28 kn | 38knboats in | 19°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 NovHigh 00:51 +0.5 mLow 06:51 −0.5 mHigh 13:14 +0.7 mLow 19:44 −0.6 m
- Tue 3 NovHigh 02:00 +0.5 mLow 08:04 −0.5 mHigh 14:21 +0.6 mLow 20:44 −0.6 m
- Wed 4 NovHigh 03:03 +0.6 mLow 09:12 −0.5 mHigh 15:22 +0.6 mLow 21:37 −0.6 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.
Best time to go
best May–Aug
Good diving days in a typical week, each month, for experienced divers, from 2016 on (ERA5 history scored the same way).
- Jan5of 7: a trip from Sat 2 Jan
- Feb6of 7: a trip from Sat 6 Feb
- Mar6of 7: a trip from Sat 6 Mar
- Apr6of 7: a trip from Sat 3 Apr
- May7of 7: a trip from Sat 1 May
- Jun7of 7: a trip from Sat 5 Jun
- Jul7of 7: a trip from Sat 3 Jul
- Aug7of 7: a trip from Sat 7 Aug
- Sep6of 7: a trip from Sat 4 Sept
- Oct6of 7: a trip from Sat 2 Oct
- Nov6of 7: a trip from Tue 3 Nov
- Dec6of 7: a trip from Sat 5 Dec
Tap a month to see this spot for a trip then.
Typical, not a forecast: the sea and the mean wind of each day, with no gusts or rain in the history.
Map
the site and its town
Great Isaac on Google Maps · Directions
Each place wears its best day on these dates: green good, amber fair, pale red poor, as the key says.
The map needs JavaScript. Every place on it is listed on this page, and each place's page links to Google Maps.
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 Great Isaac
A wreck dive. It goes down to 27 m. You get in from a boat. It suits experienced divers only, as a dive guide states it. No dive centre within 50 km on the map: book a liveaboard or a boat from further off. The sea is about 7°C in February, its coldest month (drysuit), and 24°C in July, its warmest (5 mm wetsuit). For experienced divers the best months are usually May, June, July and August, with about 7 good days in 7; in January, about 5. From the weather of past years. The town to stay in is Seaside Park. Within 5 km we also list 1 dive site.
- What it is Wreck.
- How deep Down to 27 m.
- Getting in From a boat.
- Who it suits Suits experienced divers only, as a dive guide states it.
- Dive centres No dive centre within 50 km on the map: book a liveaboard or a boat from further off.
Water about 15°C: 7 mm semi-dry or a drysuit. Typical sea temperature for the time of year, not a forecast.
Visibility about 6 m. Typical for the time of year, estimated from ten years of NASA satellite water clarity, not a forecast. Clearest in Sep (about 10 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$958–US$1,720 each
about US$958–US$1,720 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 JFK, estimated from distance and season, 4 airlines on the route, with a hold bag | about US$161–US$328 |
| Hire car | 6 days, shared | about US$154–US$255 |
| Stay | 6 nights, a mid-range double, shared | about US$301–US$502 |
| Food | 7 days eating out | about US$342–US$636 |
| Total | about US$958–US$1,720 |
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: Seaside Park
about 1h 40m by car · 52 places to stay
about US$114/nightcountry average
About Seaside Park its beds, food and every spot near it
About US$114 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 6h 10m
About 6h 10m door to door from Chicago
Fly ORD → JFK, direct, then 2h by road
Flights ORD → JFK on your dates · Skyscanner
An estimate, one way; the journey never changes the score.
In the water
Dives and courses in Seaside Park · GetYourGuideDive gear hire in Seaside Park · GetYourGuide
Dive centres nearby
No dive centre mapped within 50 km.
Dive centres: © OpenStreetMap contributors (ODbL). Credits
What you might see
Too few open records near this site to list its animals. Ask a dive centre what you are likely to see.
This week's visibility, the current and the life no free forecast gives. Ask a dive centre before you book.