Marine Lab
Surf spot · Guam
Is it worth the trip?
36Poor out of 100 for your dates
Best on Sat 7: 4 ft swell at 8 s, sheltered (estimated): holds up in a blow
Tue 3 · 22 out of 100
- Swell
- 3 ft6 shollow
- Energy
- 72kJ
- Wind
- ESE 9 kn
- Temp
- 29°C
Wed 4 · 43 out of 100
- Swell
- 4 ft8 shollow
- Energy
- 148kJ
- Wind
- E 9 kn
- Temp
- 29°C
Thu 5 · 34 out of 100
- Swell
- 4 ft7 smushy
- Energy
- 165kJ
- Wind
- E 11 kn
- Temp
- 29°C
Fri 6 · 34 out of 100
- Swell
- 5 ft7 smushy
- Energy
- 214kJ
- Wind
- ENE 11 kn
- Temp
- 29°C
Sat 7 · 51 out of 100
- Swell
- 4 ft8 shollow
- Energy
- 189kJ
- Wind
- ESE 8 kn
- Temp
- 28°C
Sun 8 · 25 out of 100
- Swell
- 4 ft7 smushy
- Energy
- 107kJ
- Wind
- E 13 kn
- Temp
- 29°C
Mon 9 · 17 out of 100
- Swell
- 3 ft7 smushy
- Energy
- 89kJ
- Wind
- ENE 11 kn
- Temp
- 30°C
Tap a day for waves, wind and the temperature. Full forecast
Forecast: next 10 days
Full forecast- Tue 325, poor
- Wed 438, poor
- Thu 533, poor
- Fri 631, poor
- Sat 749, fair
- Sun 821, poor
- Mon 920, poor
- Tue 1037, poor
- Wed 1149, fair
- Thu 1229, poor
The spot in six facts
- Faces SEtakes swell from the SE
- Offshore: NWwind from the land
- Intermediate +who it suits
- Works 3–13 ftof swell
- Water 30 °Cno wetsuit
- Best Aug–Sep1 good days in 7
Full forecast
every day, every number
Marine Lab does not suit beginners. This is the forecast for intermediates, so you can see what it does.
| Day | Scorefor Intermediate | Swell | Energy | Wind | Temp |
|---|---|---|---|---|---|
| Tue 3Nov | 25, poor | 3 ft6 shollow3 ft at break (est.) | 72kJ | wind from the east-south-east, 9 knots | 29°C |
| Wed 4Nov | 38, poor | 4 ft8 shollow4 ft at break (est.) | 148kJ | wind from the east, 9 knots | 29°C |
| Thu 5Nov | 33, poor | 4 ft7 smushy4 ft at break (est.) | 165kJ | wind from the east, 11 knots | 29°C |
| Fri 6Nov | 31, poor | 5 ft7 smushy4 ft at break (est.) | 214kJ | wind from the east-north-east, 11 knots | 29°C |
| Sat 7Nov | 49, fair | 4 ft8 shollow4 ft at break (est.) | 189kJ | wind from the east-south-east, 8 knots | 28°C |
| Sun 8Nov | 21, poor | 4 ft7 smushy4 ft at break (est.) | 107kJ | wind from the east, 13 knots | 29°C |
| Mon 9Nov | 20, poor | 3 ft7 smushy3 ft at break (est.) | 89kJ | wind from the east-north-east, 11 knots | 30°C |
| Tue 10Nov | 37, poor | 4 ft7 shollow4 ft at break (est.) | 158kJ | wind from the east, 10 knots | 29°C |
| Wed 11Nov | 49, fair | 4 ft7 shollow4 ft at break (est.) | 139kJ | wind from the east-south-east, 7 knots | 29°C |
| Thu 12Nov | 29, poor | 3 ft8 shollow3 ft at break (est.) | 121kJ | wind from the east-north-east, 10 knots | 30°C |
Energy is the swell's power, in kJ per metre of wave. Wind is in knots, the arrow where it blows to; green is offshore. More
Tide
- Tue 3 NovHigh 00:57 +0.2 mLow 08:11 −0.4 mHigh 15:33 +0.3 mLow 21:42 −0.1 m
- Wed 4 NovHigh 02:39 +0.2 mLow 09:16 −0.3 mHigh 16:11 +0.3 mLow 22:33 −0.1 m
- Thu 5 NovHigh 04:11 +0.2 mLow 10:18 −0.2 mHigh 16:44 +0.3 mLow 23:19 −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. 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 Aug–Sep
Good days in a typical week, each month, for intermediate surfers, from 2016 on (history scored the same way).
- Jan0of 7: a trip from Sat 2 Jan
- Feb0of 7: a trip from Sat 6 Feb
- Mar0of 7: a trip from Sat 6 Mar
- Apr0of 7: a trip from Sat 3 Apr
- May0of 7: a trip from Sat 1 May
- Jun0of 7: a trip from Sat 5 Jun
- Jul0of 7: a trip from Sat 3 Jul
- Aug1of 7: a trip from Sat 7 Aug
- Sep1of 7: a trip from Sat 4 Sept
- Oct0of 7: a trip from Sat 2 Oct
- Nov0of 7: a trip from Wed 4 Nov
- Dec0of 7: a trip from Sat 5 Dec
Tap a month to see this spot for a trip then.
Typical, not a forecast.
Map
the spot and its town
Marine Lab on Google Maps · Directions
Each place wears its best day on these dates, a surf spot for beginners: green good, amber fair, pale red poor, as the key says.
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More surf near here
5 places
- Ylig 4.7 km away
- Boat Basin Rights 7.9 km away
- Boat Basin Lefts 8 km away
- Rick's Reef 8.4 km away
- Pickop's Point 10.1 km away
About
the place in full, sources, credits
About Marine Lab
Facing, offshore wind, exposure, level and swell range are estimated.
The spot faces SE (138°), so it takes swell from the SE. The wind blows offshore from the NW (318°). It is sheltered to the open swell. It suits intermediate surfers and up, because of a steep sea floor. It works in 3–13 ft of swell. The sea floor shelves very steeply: 10 m deep about 100 m out (1 in 9). On a typical 5 ft, 11 s swell the waves here would break hollow. The sea is about 28°C in January, its coldest month (no wetsuit), and 30°C in June, its warmest (no wetsuit). For intermediate surfers the best months are usually August and September, with about 1 good days in 7. From the weather of past years. The town to stay in is Agat. Within 5 km we also list 1 surf spot.
Water about 30°C: no wetsuit. Typical sea temperature for the time of year, not a forecast.
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$1,280–US$2,480 each
about US$1,280–US$2,480 each · 6 nights, 2 sharing: flights, taxi, stay, food, board and wetsuit.
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 2 November 2026.
How we worked it out
| What | How we worked it out | Each |
|---|---|---|
| Flights | return ORD to GUM, estimated from distance and season, changing at HNL, full-service airlines, with a hold bag | about US$751–US$1,560 |
| Taxi | airport and back, shared | about US$20–US$34 |
| Stay | 6 nights, a mid-range double, shared | about US$201–US$329 |
| Food | 7 days eating out | about US$221–US$416 |
| Board and wetsuit | 5 days, or about US$114 to fly your own | about US$87–US$141 |
| Total | about US$1,280–US$2,480 |
For 2 people sharing a room. Lessons, lift-pass deals and insurance are extra. Prices from public sources, checked in 2026.
Where to stay: Agat
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35 min by car · 3 places to stay
About Agat its beds, food and every spot near it
Nearest beds: Agat, 16 km (35 min by car)
Drives are estimates. Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 2 November 2026.
Getting there: about 24h 45m
About 24h 45m door to door from Chicago
Fly ORD → GUM, changing at Daniel K. Inouye International Airport (HNL), then 25 min by road
Flights ORD → GUM on your dates · AviasalesAdeSIM for your phone · Search on AiraloAd
An estimate, one way; the journey never changes the score.
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.