Surf Forecasts:
Boat Basin Lefts surf forecast from 12 Jun 2026:
- Best quality surf: Monday 15 Jun, 4AM (local time) - 2ft (0.6m), 9s period, E swell with cross-offshore winds.
- Most powerful swell: Friday 19 Jun, 4PM (local time) - 2.5ft (0.7m), 8s period, ENE swell with 67 kJ wave energy.
- Next surfable swell (1★+): Monday 15 Jun, 4AM (local time) - 2ft (0.6m), 9s period with E swell.
Best Forecast Surf Conditions for Boat Basin Lefts this week:
The surf forecast for Boat Basin Lefts over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jun 15) at 4AM. The primary swell is predicted to be 0.6m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Boat Basin Lefts in the next 16 days are 0.7m 8s and forecast to arrive on Friday (Jun 19) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 10s period and expected on Tuesday (Jun 16) at 7AM.
| Wave Type | Time (ChST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Mon 15th Jun) | 2ft (0.6m) 9s |
| Best Surf | 4AM (Mon 15th Jun) | 2ft (0.6m) 9s |
| Most Powerful | 4PM (Fri 19th Jun) | 2.5ft (0.7m) 8s |
Table - best surf conditions forecast for Boat Basin Lefts over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 30°C on Sat morning, min 27°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 17mm), heaviest on Tue morning. Warm (max 30°C on Tue afternoon, min 27°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | NE 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 18 | 27 | 41 | 40 | 39 | 38 | 39 | 55 | 39 | 57 | 57 | 59 | 62 | 61 | 59 | 57 | 57 | 51 | 49 | 61 | 67 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | glassy | glassy | glassy | on | cross-on |
High Tide | 4:26AM0.92m | 7:35PM0.88m | 5:11AM0.94m | 8:32PM0.92m | 6:00AM0.95m | 9:25PM0.95m | 6:51AM0.95m | 10:15PM0.95m | 7:45AM0.94m | 11:02PM0.95m | 8:41AM0.91m | 11:45PM0.94m | 9:41AM0.85m | ||||||||
Low Tide | 11:08PM0.65m | 12:05PM0.04m | 00:15AM0.70m | 12:54PM-0.04m | 1:16AM0.72m | 1:44PM-0.09m | 2:13AM0.73m | 2:35PM-0.10m | 3:08AM0.72m | 3:25PM-0.07m | 4:05AM0.70m | 4:14PM-0.01m | 5:06AM0.66m | 5:02PM0.09m | |||||||
 |  | | | | | | | |  |  | | | | | | | |  | | | |
 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — |
 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:49 | — | — | 6:49 | — | — | 6:49 | — | — | 6:49 |
mm | — | — | — | — | — | — | — | — | — | 2 | 6 | 4 | 1 | — | — | 1 | — | 3 | 1 | 1 | 1 |
Temp °C | 28 | 30 | 29 | 28 | 30 | 30 | 28 | 30 | 30 | 28 | 29 | 30 | 28 | 30 | 30 | 28 | 29 | 29 | 28 | 29 | 29 |
Feels °C | 31 | 32 | 31 | 32 | 32 | 32 | 31 | 32 | 32 | 31 | 32 | 33 | 32 | 33 | 33 | 32 | 33 | 34 | 32 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | NE 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | SE 9 | E 9 | SE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | ENE 8 |
| kJ | 18 | 27 | 41 | 40 | 39 | 38 | 39 | 55 | 39 | 20 | 57 | 43 | 62 | 61 | 59 | 57 | 57 | 51 | 49 | 61 | 67 |
Swell 2 Height (m) Direction Period (s) | ESE 5 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | SE 10 | SE 8 | SE 9 | S 8 | SE 10 | S 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 10 |
| kJ | 4 | 17 | 17 | 16 | 10 | 11 | 23 | 17 | 29 | 5 | 45 | 12 | 41 | 41 | 41 | 41 | 40 | 41 | 36 | 35 | 35 |
Swell 3 Height (m) Direction Period (s) | E 8 | WNW 10 | ESE 8 | SE 9 | SE 9 | ESE 8 | NE 8 | SE 10 | NE 7 | SE 11 | N 9 | N 9 | S 8 | N 9 | N 8 | N 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 |
| kJ | 12 | 10 | 7 | 12 | 12 | 7 | 10 | 16 | 9 | 19 | 6 | 7 | 10 | 14 | 13 | 12 | 12 | 11 | 12 | 22 | 12 |
Wind waves Height (m) Direction Period (s) | NE 4 | E 4 | — | — | — | — | — | — | — | E 9 | — | ENE 9 | NE 5 | — | — | — | — | — | W 3 | — | — |
| kJ | 1 | 4 | — | — | — | — | — | — | — | 57 | — | 59 | 12 | — | — | — | — | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1304 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2258 | 0 | 0 | 1958 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 11 |
Best forecast wave conditions in Guam | |||||||||||||||||||||
Best forecast wave conditions in Guam | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Boat Basin Lefts surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Boat Basin Lefts Surf forecast
The above surf forecast table for Boat Basin Lefts provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Boat Basin Lefts can be found by selecting the local surf guide option on the grey menu. Our Boat Basin Lefts surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Boat Basin Lefts) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Boat Basin Lefts may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Boat Basin Lefts is 1 km (1 miles) from Agana. If you plan a holiday in Guam, look for hotels and other accommodation in Agana. Agana has rooms for a wide range of budgets as well as car hire and transport links.
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