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Surf Forecasts:
Boat Basin Lefts surfForecast / Guam / Guam
48hr Weather and Surf, issued 9 am Monday 18 May 2026 ChSTForecast update in hr min s Forecast update imminent
Boat Basin Lefts surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Boat Basin Lefts sea temperature is
28.7° C
(Which is normal for this time of year)How big are the waves at Boat Basin Lefts today?
The current surf forecast for Boat Basin Lefts at 3PM is: 1.8m 9s primary swell from a East direction and 0.2m 9s secondary swell from a North direction, 0.1m 8s secondary swell from a North direction (forecast issued at 09:00am May 18). The wind direction is predicted to be cross-offshore.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 6ft (1.8m) | 10s |
| Afternoon (18 May) | 6ft (1.8m) | 9s |
| Evening (18 May) | 6ft (1.8m) | 9s |
Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 6mm), mostly falling on Tue morning. Warm (max 28°C on Mon morning, min 27°C on Mon afternoon). Mainly fresh winds. | ||||||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 9 | E 9 | |
573 | 561 | 561 | 549 | 549 | 549 | 539 | 601 | 606 | 606 | 606 | 614 | 619 | 556 | 627 | 614 | 614 | 614 | 593 | 601 | 588 | 599 | 586 | 517 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 7:14AM0.94m | 10:22PM0.95m | 7:58AM0.93m | 11:18PM0.94m | 8:46AM0.91m | 00:14AM0.92m | ||||||||||||||||||
Low Tide | 2:48PM-0.08m | 3:20AM0.71m | 3:38PM-0.07m | 4:16AM0.72m | 4:30PM-0.03m | |||||||||||||||||||
 | | |  |  |  | | | |  | | | | | |  | | | | | | | | | |
 | 5:54 | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — | — | 5:52 |
 | — | — | — | 6:39 | — | — | — | — | — | — | — | 6:39 | — | — | — | — | — | — | — | 6:40 | — | — | — | 6:40 |
— | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | 1 | — | 1 | 1 | — | — | — | 1 | — | |
Temp °C | 27 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 27 | 27 | 27 | 27 |
27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 26 | 28 | 28 | 28 | 28 | 28 | 28 | |
Swell 1 Height (m) Direction Period (s) | NNE 9 | NNE 9 | N 9 | N 9 | N 9 | N 7 | N 7 | NNE 9 | NNE 9 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | — | NE 10 | NE 10 | NE 10 | NNE 10 |
 kJ | 7 | 7 | 6 | 6 | 6 | 4 | 4 | 8 | 8 | 8 | 8 | 8 | 3 | 7 | 7 | 8 | 3 | 3 | 3 | — | 4 | 4 | 4 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | N 8 | N 9 | — | NNE 9 | NE 9 | N 7 | — | — | — | — | — | — | — | — | N 11 | N 11 | N 11 | — | N 8 | S 9 | S 9 | N 13 |
| kJ | — | — | 1 | 2 | — | 8 | 3 | 1 | — | — | — | — | — | — | — | — | 2 | 2 | 2 | — | 1 | 2 | 2 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 9 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 9 | E 9 |
| kJ | 573 | 561 | 561 | 549 | 549 | 549 | 539 | 601 | 606 | 606 | 606 | 614 | 619 | 556 | 627 | 614 | 614 | 614 | 593 | 601 | 588 | 599 | 586 | 517 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 1836 | 1836 | 1836 | 1836 | 1836 | 1836 | 1836 | 1836 | 1836 | 1864 | 1836 | 1836 | 1290 | 1290 | 1836 | 1290 | 1290 | 1290 | 1290 | 1907 | 1866 | 1836 | 1836 | 1836 |
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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