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Threes surfForecast / Guam / Guam
12 Day Weather and Surf, issued 9 pm Saturday 18 Oct 2025 ChST
Best Forecast Surf Conditions for Threes this week:
The surf forecast for Threes over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Oct 20) at 10AM. The primary swell is predicted to be 0.6m and 8s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Threes in the next 12 days are 0.8m 12s and forecast to arrive on Tuesday (Oct 21) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Sunday (Oct 19) at 1AM.
| Wave Type | Time (ChST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Mon 20th Oct) | 2ft (0.6m) 8s |
| Best Surf | 10AM (Mon 20th Oct) | 2ft (0.6m) 8s |
| Most Powerful | 10AM (Tue 21st Oct) | 2.5ft (0.8m) 12s |
Table - best surf conditions forecast for Threes over the next 12 days.
Short Range Forecast Moderate rain (total 10mm), heaviest on Mon morning. Warm (max 29°C on Sun morning, min 28°C on Sat night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 28mm), heaviest during Thu night. Warm (max 29°C on Wed morning, min 28°C on Tue night). Wind will be generally light. | |||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Sat 25 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 11 | 10 | 8 | 12 | 12 | 12 | 12 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 71 | 66 | 44 | 37 | 57 | 49 | 99 | 179 | 140 | 128 | 88 | 68 | 68 | 38 | 47 | 24 | 23 | 23 | 17 | 27 | 26 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | off | cross- off | off | cross- off | cross- off | off | off | off | off | cross- off | off | off | off | off | off | cross- off | off | |
High Tide / height (m) | 6:17AM 0.63 | 6:35PM 0.71 | 7:09AM 0.66 | 6:56PM 0.70 | 7:56AM 0.67 | 7:15PM 0.69 | 8:38AM 0.68 | 7:33PM 0.68 | 9:19AM 0.69 | 7:52PM 0.66 | 10:00AM 0.68 | 8:11PM 0.65 | 10:44AM 0.68 | |||||||||
Low Tide / height (m) | 12:24AM 0.22 | 12:20PM 0.18 | 12:57AM 0.14 | 12:58PM 0.24 | 1:27AM 0.08 | 1:33PM 0.30 | 1:55AM 0.04 | 2:07PM 0.35 | 2:23AM 0.01 | 2:40PM 0.40 | 2:52AM -0.00 | 3:13PM 0.44 | 3:22AM -0.01 | 3:49PM 0.48 | ||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Sat 25 | ||||||||||||||||
| Sunrise | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:13 | - | - | 6:13 | - | |
| Sunset | - | - | 6:00 | - | - | 6:00 | - | - | 5:59 | - | - | 5:59 | - | - | 5:58 | - | - | 5:58 | - | - | 5:57 | |
 |  |  | | | |  | | |  | | | | | | | | | | | | ||
Rain (mm) | 1 | 1 | - | 2 | 3 | - | - | 1 | 2 | 2 | 3 | 3 | - | 4 | 1 | 11 | 3 | 1 | 4 | - | - | |
| Temp. °C | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 28 | 28 | 29 | 29 | |
| Feels °C (?) | 29 | 30 | 30 | 30 | 32 | 32 | 30 | 31 | 30 | 30 | 32 | 32 | 30 | 32 | 31 | 30 | 31 | 31 | 31 | 32 | 32 | |
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Recent Eyeball Surf Reports for Guam
Continuing clean conditions at Threes (calm at Windward Hills wx 15 km from Threes). 0.5m 11s groundswell from the NNE to make surfable waves.
Actual: 55 min ago
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 Threes 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 Threes Surf forecast
The above surf forecast table for Threes provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Threes can be found by selecting the local surf guide option on the grey menu. Our Threes 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 (Threes) 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 Threes 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.
Threes is 25 km (16 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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