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Boat Basin Lefts surfForecast / Guam / Guam
12 Day Weather and Surf, issued 3 pm Monday 07 Jul 2025 ChST
Best Forecast Surf Conditions for Boat Basin Lefts this week:
The surf forecast for Boat Basin Lefts over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jul 07) at 7PM. The primary swell is predicted to be 2ft 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 12 days are 3ft 8s and forecast to arrive on Saturday (Jul 12) at 1PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6ft 5s period and expected on Saturday (Jul 12) at 4PM.
| Wave Type | Time (ChST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Mon 7th Jul) | 2ft (0.6m) 9s |
| Best Surf | 1PM (Sat 12th Jul) | 3.5ft (1.0m) 8s |
| Most Powerful | 1PM (Sat 12th Jul) | 3.5ft (1.0m) 8s |
Table - best surf conditions forecast for Boat Basin Lefts over the next 12 days.
Mon 07 | Tuesday 08 | Wednesday 09 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Sat 19 | ||||||||||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (ft) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 9 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 10 | 8 | 8 | 9 | 9 | 9 | 9 | 11 | 9 | 9 | 9 | 9 | 11 | 12 | 12 | 11 | 9 | 10 | 9 | 9 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 68 | 28 | 24 | 39 | 41 | 55 | 45 | 40 | 41 | 46 | 61 | 8 | 49 | 42 | 85 | 31 | 105 | 144 | 46 | 44 | 165 | 215 | 191 | 256 | 97 | 234 | 180 | 298 | 607 | 543 | 489 | 395 | 187 | 105 | 336 | 57 |
Wind (mph) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | cross- off | glass | glass | cross- off | off | glass | glass | cross | 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 | cross- off |
High Tide / height (ft) | 7:24PM 2.53 | 4:06AM 2.72 | 8:06PM 2.66 | 4:51AM 2.72 | 8:44PM 2.72 | 5:37AM 2.79 | 9:19PM 2.82 | 6:23AM 2.82 | 9:52PM 2.85 | 7:09AM 2.85 | 10:23PM 2.92 | 7:57AM 2.85 | 10:52PM 2.95 | 8:48AM 2.79 | 11:19PM 2.99 | 9:46AM 2.66 | 11:45PM 3.02 | 10:53AM 2.53 | 12:12AM 3.02 | 12:13PM 2.36 | 12:41AM 3.02 | 1:49PM 2.3 | 1:14AM 3.02 | |||||||||||||
Low Tide / height (ft) | 11:19PM 2.3 | 12:08PM 0.43 | 12:18AM 2.33 | 12:49PM 0.3 | 1:07AM 2.33 | 1:30PM 0.2 | 1:52AM 2.33 | 2:10PM 0.13 | 2:35AM 2.3 | 2:49PM 0.13 | 3:20AM 2.23 | 3:27PM 0.23 | 4:08AM 2.13 | 4:04PM 0.43 | 4:58AM 1.94 | 4:42PM 0.69 | 5:51AM 1.74 | 5:22PM 0.98 | 6:47AM 1.44 | 6:05PM 1.35 | 7:44AM 1.15 | 6:54PM 1.71 | 8:43AM 0.85 | |||||||||||||
Mon 07 | Tuesday 08 | Wednesday 09 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Sat 19 | ||||||||||||||||||||||||
| Sunrise | - | - | 5:58 | - | - | 5:58 | - | - | 5:58 | - | - | 6:00 | - | - | 6:00 | - | - | 6:00 | - | - | 6:01 | - | - | 6:01 | - | - | 6:01 | - | - | 6:01 | - | - | 6:01 | - | - | 6:01 |
| Sunset | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - |
 |  |  |  | |  | | | | | | | | | | |  | | | | | |  | | | | |  | | | | | | | | | |
Rain (in) | - | 0.2 | - | - | 0.2 | 0.0 | 0.0 | 0.1 | - | - | 0.0 | - | 0.1 | 0.1 | 0.1 | - | 0.1 | 0.0 | 0.2 | 0.2 | 0.1 | 0.2 | 0.4 | 1.5 | 1.1 | 0.4 | 0.4 | 0.4 | 0.5 | 0.2 | 0.2 | 0.5 | 0.2 | 0.2 | 0.3 | 0.1 |
| Temp. °F | 84 | 82 | 84 | 84 | 82 | 86 | 86 | 81 | 86 | 86 | 82 | 84 | 84 | 81 | 81 | 82 | 81 | 82 | 82 | 81 | 82 | 82 | 81 | 79 | 79 | 79 | 81 | 81 | 81 | 82 | 81 | 81 | 82 | 82 | 82 | 84 |
| Feels °F (?) | 90 | 90 | 86 | 86 | 88 | 90 | 90 | 88 | 91 | 91 | 90 | 90 | 88 | 86 | 88 | 90 | 88 | 90 | 91 | 90 | 90 | 90 | 84 | 84 | 84 | 84 | 84 | 79 | 79 | 79 | 77 | 79 | 82 | 84 | 84 | 90 |
Short Range Forecast: Moderate rain (total 0.6in), heaviest on Mon night. Warm (max 86°F on Wed morning, min 79°F on Tue morning). Wind will be generally light. | Days 3-6 Weather Summary Moderate rain (total 0.5in), heaviest on Sat morning. Warm (max 86°F on Thu afternoon, min 79°F on Sat night). Wind will be generally light. | Days 6-9 Weather Summary Heavy rain (total 4.5in), heaviest during Tue morning. Warm (max 82°F on Sun afternoon, min 77°F on Tue morning). Wind will be generally light. | Long Range Forecast: Heavy rain (total 2.8in), heaviest during Wed afternoon. Warm (max 84°F on Sat morning, min 79°F on Wed afternoon). Winds decreasing (strong winds from the SSW on Thu morning, light winds from the SSW by Sat afternoon). | |||||||||||||||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
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 12 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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