Surf Forecasts:
Umatac surf forecast from 2 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 7AM (local time) - 5ft (1.6m), 9s period, WNW swell with cross-offshore winds.
- Most powerful swell: Friday 4 Sep, 4AM (local time) - 8ft (2.5m), 9s period, W swell with 1,122 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 7AM (local time) - 5ft (1.6m), 9s period with WNW swell.
Best Forecast Surf Conditions for Umatac this week:
The surf forecast for Umatac over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 7AM. The primary swell is predicted to be 1.6m 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 16 days are 2.5m 9s and forecast to arrive on Friday (Sep 04) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 6s period and expected on Friday (Sep 04) at 7PM.
| Wave Type | Time (ChST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Tue 8th Sep) | 5ft (1.6m) 9s |
| Best Surf | 7AM (Tue 8th Sep) | 5ft (1.6m) 9s |
| Most Powerful | 4AM (Fri 4th Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Umatac over the next 16 days.
Short Range ForecastHeavy rain (total 50mm), heaviest during Sat afternoon. Warm (max 28°C on Thu night, min 25°C on Sat afternoon). Winds decreasing (strong winds from the WSW on Thu afternoon, light winds from the W by Fri night). | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Sun afternoon. Warm (max 28°C on Mon morning, min 26°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | WNW 8 | WNW 9 | WNW 10 | W 9 | W 8 | W 8 | W 8 | W 8 | WNW 8 | WNW 8 | WNW 9 | W 8 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 370 | 281 | 692 | 753 | 568 | 511 | 382 | 302 | 287 | 130 | 154 | 165 | 266 | 232 | 271 | 359 | 638 | 516 | 495 | 385 | 415 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross |
High Tide | 12:39PM0.61m | 11:01PM0.70m | 2:21PM0.60m | 11:45PM0.69m | 4:09PM0.63m | 00:50AM0.67m | 5:23PM0.67m | 2:18AM0.66m | 6:12PM0.71m | 3:50AM0.67m | 6:50PM0.73m | 5:07AM0.69m | 7:22PM0.74m | ||||||||
Low Tide | 5:24PM0.44m | 6:39AM0.00m | 6:25PM0.52m | 7:52AM-0.02m | 8:05PM0.56m | 9:10AM-0.04m | 9:58PM0.56m | 10:22AM-0.07m | 11:14PM0.51m | 11:23AM-0.09m | 00:08AM0.45m | 12:16PM-0.08m | 00:52AM0.37m | ||||||||
 |  |  |  | | | | |  |  | |  | | |  | | | | | |  | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — |
mm | 2 | 7 | 3 | — | 3 | 8 | 8 | 13 | 6 | — | 5 | 1 | — | — | — | — | — | 5 | — | — | — |
Temp °C | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 26 | 26 | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 26 | 25 | 27 | 27 | 28 | 29 | 30 | 28 | 26 | 30 | 30 | 30 | 31 | 31 | 30 | 31 | 30 | 28 | 30 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | WNW 9 | WNW 10 | NE 9 | SE 8 | SE 8 | W 8 | W 8 | SE 10 | WNW 8 | WNW 9 | W 8 | SE 9 | WNW 9 | WNW 9 | WNW 9 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 9 |
| kJ | 370 | 281 | 692 | 20 | 17 | 18 | 382 | 302 | 60 | 130 | 154 | 165 | 41 | 232 | 271 | 359 | 638 | 516 | 495 | 385 | 415 |
Swell 2 Height (m) Direction Period (s) | NE 10 | WNW 12 | SE 9 | ESE 12 | ESE 11 | SE 11 | SE 10 | SE 10 | WNW 12 | SE 10 | WSW 7 | SE 9 | ENE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | NNE 12 | ENE 15 |
| kJ | 24 | 235 | 20 | 14 | 12 | 29 | 36 | 79 | 14 | 59 | 42 | 55 | 7 | 29 | 29 | 22 | 31 | 34 | 24 | 47 | 72 |
Swell 3 Height (m) Direction Period (s) | NW 14 | NE 9 | NE 9 | SE 9 | NE 8 | E 9 | SE 8 | ENE 9 | ENE 9 | WNW 10 | SE 10 | ENE 8 | S 8 | S 8 | E 9 | ENE 9 | ENE 9 | NNE 13 | NNE 12 | SE 10 | SE 10 |
| kJ | 46 | 22 | 13 | 3 | 11 | 6 | 17 | 16 | 7 | 42 | 59 | 14 | 5 | 5 | 14 | 17 | 29 | 58 | 49 | 25 | 24 |
Wind waves Height (m) Direction Period (s) | SW 7 | SW 6 | WSW 8 | W 9 | W 8 | W 8 | — | — | WNW 8 | WSW 7 | — | — | WNW 9 | — | — | — | — | — | — | — | — |
| kJ | 254 | 198 | 579 | 753 | 568 | 511 | — | — | 287 | 47 | — | — | 266 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2051 | 2055 | 1813 | 1813 | 2051 | 2060 | 14 | 13 | 1836 | 13 | 13 | 13 | 13 | 13 | 1943 | 13 | 1943 | 1943 | 2051 | 1889 | 1813 |
Best forecast wave conditions in Guam | |||||||||||||||||||||
Best forecast wave conditions in Guam | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 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 16 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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