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Umatac surfForecast / Guam / Guam
12 Day Weather and Surf, issued 3 pm Friday 09 May 2025 ChST
Best Forecast Surf Conditions for Umatac this week:
The surf forecast for Umatac over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (May 10) at 10PM. The primary swell is predicted to be 0.9m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Umatac in the next 12 days are 0.9m 11s and forecast to arrive on Monday (May 12) at 10PM. 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 Tuesday (May 13) at 1PM.
| Wave Type | Time (ChST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 10th May) | 3ft (0.9m) 9s |
| Best Surf | 10PM (Sat 10th May) | 3ft (0.9m) 9s |
| Most Powerful | 10PM (Mon 12th May) | 3ft (0.9m) 11s |
Table - best surf conditions forecast for Umatac over the next 12 days.
Fri 09 | Saturday 10 | Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | Friday 16 | Saturday 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wed 21 | ||||||||||||||||||||||||
| 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 (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 10 | 9 | 9 | 9 | 11 | 9 | 7 | 9 | 9 | 8 | 8 | 9 | 8 | 7 | 7 | 6 | 6 | 6 | 9 | 8 | 10 | 10 | 9 | 9 | 12 | 12 | 11 | 11 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 9 | 4 | 132 | 132 | 141 | 123 | 118 | 134 | 15 | 26 | 14 | 169 | 6 | 77 | 6 | 6 | 1 | 0 | 99 | 2 | 2 | 2 | 2 | 2 | 1 | 2 | 1 | 2 | 2 | 7 | 8 | 15 | 14 | 12 | 24 | 24 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | cross- off | off | cross- off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | cross- off | off | off |
High Tide / height (m) | 6:28PM 0.59 | 5:59AM 0.70 | 7:19PM 0.62 | 6:21AM 0.70 | 8:04PM 0.65 | 6:43AM 0.69 | 8:47PM 0.67 | 7:04AM 0.68 | 9:28PM 0.69 | 7:25AM 0.68 | 10:11PM 0.69 | 7:48AM 0.67 | 10:56PM 0.69 | 8:14AM 0.67 | 11:45PM 0.69 | 8:45AM 0.66 | 12:36AM 0.69 | 9:24AM 0.65 | 1:26AM 0.69 | 10:18AM 0.62 | 2:11AM 0.70 | 11:36AM 0.58 | 2:50AM 0.71 | |||||||||||||
Low Tide / height (m) | 11:57PM 0.29 | 12:45PM 0.08 | 12:37AM 0.34 | 1:15PM 0.03 | 1:16AM 0.38 | 1:44PM -0.01 | 1:53AM 0.42 | 2:13PM -0.04 | 2:30AM 0.46 | 2:45PM -0.06 | 3:06AM 0.50 | 3:18PM -0.07 | 3:43AM 0.53 | 3:55PM -0.07 | 4:26AM 0.55 | 4:37PM -0.07 | 5:18AM 0.56 | 5:24PM -0.05 | 6:25AM 0.55 | 6:15PM -0.02 | 7:40AM 0.50 | 7:11PM 0.03 | 8:48AM 0.42 | |||||||||||||
Fri 09 | Saturday 10 | Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | Friday 16 | Saturday 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wed 21 | ||||||||||||||||||||||||
| Sunrise | - | - | 5:56 | - | - | 5:56 | - | - | 5:56 | - | - | 5:56 | - | - | 5:56 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 |
| Sunset | 6:37 | - | - | 6:37 | - | - | 6:37 | - | - | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:39 | - | - | 6:39 | - | - | 6:39 | - | - | 6:39 | - | - | 6:40 | - | - |
 |  | | |  | | | |  |  |  | | | | | | | | | | | |  | | | | | | | | | |  | | | | |
Rain (mm) | - | 2 | - | - | 1 | - | - | 1 | - | 1 | - | - | 1 | 4 | - | - | 1 | - | - | 1 | - | - | - | - | - | - | - | - | 2 | - | - | - | 2 | 7 | 4 | 2 |
| Temp. °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Feels °C (?) | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 29 | 30 | 28 | 30 | 28 | 29 | 28 | 28 | 29 | 29 | 28 | 29 | 30 | 30 | 31 | 30 |
Short Range Forecast: Light rain (total 4mm), mostly falling on Fri night. Warm (max 28°C on Fri afternoon, min 27°C on Fri night). Wind will be generally light. | Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Mon afternoon. Warm (max 28°C on Mon afternoon, min 27°C on Mon night). Mainly fresh winds. | Days 6-9 Weather Summary Some drizzle, heaviest during Thu night. Warm (max 29°C on Fri afternoon, min 27°C on Thu night). Mainly fresh winds. | Long Range Forecast: Moderate rain (total 17mm), heaviest on Tue afternoon. Warm (max 28°C on Sun afternoon, min 27°C on Mon night). Wind will be generally light. | |||||||||||||||||||||||||||||||||
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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 Umatac 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 Umatac Surf forecast
The above surf forecast table for Umatac provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Umatac can be found by selecting the local surf guide option on the grey menu. Our Umatac 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 (Umatac) 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 Umatac 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.
Umatac is 22 km (14 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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