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Guana Bay Surf Forecast
/ Saint Martin (9 surf breaks) /
Guana Bay surfForecast / Saint Martin / Netherlands Antilles
12 Day Weather and Surf, issued 7 am Monday 11 Aug 2025 AST
Best Forecast Surf Conditions for Guana Bay this week:
The surf forecast for Guana Bay over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 16) at 2AM. The primary swell is predicted to be 1.6m and 14s period with a secondary swell of 1.0m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Guana Bay in the next 12 days are 3.0m 14s and forecast to arrive on Saturday (Aug 16) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 9s period and expected on Sunday (Aug 17) at 8PM.
| Wave Type | Time (AST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sat 16th Aug) | 5ft (1.6m) 14s |
| Best Surf | 11AM (Sat 16th Aug) | 10ft (3.0m) 13s |
| Most Powerful | 2PM (Sat 16th Aug) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Guana Bay over the next 12 days.
Short Range Forecast Light rain (total 3mm), mostly falling on Tue morning. Warm (max 29°C on Wed morning, min 27°C on Wed night). Mainly fresh winds. | Days 3-6 Weather Summary Moderate rain (total 18mm), heaviest on Fri night. Warm (max 28°C on Thu morning, min 27°C on Thu morning). Winds decreasing (fresh winds from the E on Thu morning, light winds from the NW by Sat morning). | ||||||||||||||||||||
Monday 11 | Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 5 | 6 | 6 | 8 | 8 | 8 | 9 | 9 | 9 | 8 | 8 | 8 | 14 | 13 | 12 | 11 | 9 | 9 | 8 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 160 | 134 | 170 | 197 | 162 | 235 | 193 | 196 | 358 | 418 | 357 | 301 | 235 | 237 | 1157 | 2582 | 2031 | 575 | 322 | 211 | 94 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | on | on | on | on | cross- on | on | on | on | on | on | on | cross- on | cross- off | cross- off | cross- off | cross- off | cross | cross | cross- on |
High Tide / height (m) | 8:39AM 0.27 | 9:58PM 0.34 | 10:02AM 0.29 | 10:23PM 0.32 | 11:17AM 0.31 | 10:45PM 0.29 | 12:27PM 0.33 | 11:02PM 0.26 | 1:35PM 0.34 | 11:11PM 0.24 | 2:43PM 0.35 | 3:52PM 0.36 | |||||||||
Low Tide / height (m) | 2:48PM 0.12 | 3:58AM 0.18 | 3:45PM 0.15 | 4:26AM 0.14 | 4:48PM 0.18 | 5:01AM 0.10 | 6:02PM 0.21 | 5:42AM 0.06 | 7:48PM 0.23 | 6:28AM 0.03 | 7:21AM 0.01 | ||||||||||
Monday 11 | Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | |||||||||||||||
| Sunrise | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - |
| Sunset | - | 6:40 | - | - | 6:39 | - | - | 6:39 | - | - | 6:38 | - | - | 6:37 | - | - | 6:37 | - | - | 6:37 | - |
 | |  |  |  | | | |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | 1 | 1 | - | - | - | 1 | - | - | 2 | - | - | 9 | 1 | - | 6 | - | 1 | 3 |
| Temp. °C | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 |
| Feels °C (?) | 28 | 29 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 27 | 28 | 28 | 28 | 31 | 29 | 32 | 30 | 29 | 28 | 29 | 31 |
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Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Saint Martin
Wind reports 5 km away suggest it is still onshore at Guana Bay (fresh winds from the E at Wind-adventures.com). 0.8m 3s local chop from the E with a 0.5m 8s swell from the ESE. 2 swells combining to make bigger set waves.
1 h 31 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 Guana Bay 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 Guana Bay Surf forecast
The above surf forecast table for Guana Bay provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Guana Bay can be found by selecting the local surf guide option on the grey menu. Our Guana Bay 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 (Guana Bay) 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 Guana Bay 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.
Are you planning a holiday in Netherlands-Antilles - Saint Martin? If you are looking for accommodation near Guana Bay, camping, hotels and holiday cottages in Netherlands-Antilles - Saint Martin, consider staying in Marigot which is 7 km (4 miles) away. Other places in and around Netherlands-Antilles - Saint Martin where you can find information about places to rent, and car hire include Philipsburg which is 9 km (6 miles) away, The Valley, Gustavia and Basseterre.
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