Surf Forecasts:
How big are the waves at Boat Basin Lefts today (18 Aug):
- Morning surf: Morning surf (18 Aug, local time) - 4ft (1.2m), 8s period with W swell.
- Afternoon surf: Afternoon surf (18 Aug, local time) - 3.5ft (1.1m), 8s period with W swell.
- Evening surf: Evening surf (18 Aug, local time) - 3.5ft (1.0m), 8s period with W swell.
The current surf forecast for Boat Basin Lefts at 4PM is: 1.1m 8s primary swell from a West direction (forecast issued at 09:00am August 18). An open ocean swell of 0.4m 9s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Aug) | 4ft (1.2m) | 8s |
| Afternoon (18 Aug) | 3.5ft (1.1m) | 8s |
| Evening (18 Aug) | 3.5ft (1.0m) | 8s |
Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Warm (max 29°C on Tue morning, min 27°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||||||||
7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | |
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WNW 8 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | W 8 |
Wave Graph  | ||||||||||||||||||||||
 kJ | 185 | 190 | 160 | 160 | 160 | 133 | 136 | 140 | 140 | 140 | 143 | 116 | 116 | 160 | 126 | 73 | 54 | 55 | 40 | 40 | 40 | 35 |
Wind (km/h) | ||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-off |
High Tide | 11:57AM0.74m | 11:17PM0.87m | 1:14PM0.71m | 11:43PM0.84m | 2:50PM0.69m | |||||||||||||||||
Low Tide | 5:41AM0.32m | 5:12PM0.52m | 6:29AM0.29m | 5:46PM0.59m | 7:21AM0.28m | 6:24PM0.65m | ||||||||||||||||
 |  | | |  | |  | | | |  | | | |  | | | | | | | | |
 | 6:07 | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — |
 | — | — | — | 6:40 | — | — | — | — | — | — | — | 6:39 | — | — | — | — | — | — | — | 6:39 | — | — |
mm | 1 | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | 1 | — | — | — | — | 1 | — | — |
Temp °C | 27 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 27 | 28 | 29 | 29 | 29 | 29 | 28 |
Feels °C | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 30 | 30 | 29 | 29 | 31 | 31 | 32 | 32 | 30 | 32 | 33 | 32 | 33 | 34 | 33 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WNW 8 | WNW 9 | WNW 8 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WSW 9 |
| kJ | 185 | 190 | 160 | 160 | 160 | 133 | 136 | 140 | 140 | 140 | 143 | 116 | 116 | 160 | 126 | 73 | 82 | 82 | 110 | 80 | 80 | 79 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 9 | SE 9 | SE 9 | SE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | WSW 9 | WNW 8 | WNW 8 | NNE 6 | NNE 6 | WNW 8 | NNE 6 |
| kJ | 20 | 20 | 20 | 20 | 19 | 30 | 41 | 41 | 41 | 32 | 41 | 42 | 42 | 41 | 41 | 64 | 54 | 55 | 21 | 24 | 40 | 26 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | WSW 8 | SE 9 | SE 9 | NNE 6 | WNW 8 | WNW 8 | SSE 9 | W 8 |
| kJ | 21 | 21 | 15 | 20 | 20 | 20 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 24 | 41 | 41 | 30 | 40 | 40 | 31 | 35 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NW 3 | NW 4 | NW 4 | NW 4 | NNW 4 | NNW 4 | N 4 | N 5 | N 5 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 2 | 6 | 16 | 20 | 18 | 12 | 9 | 16 | 11 | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||
Distance (km) | 0 | 3 | 11 | 2069 | 2069 | 11 | 11 | 16 | 1290 | 2069 | 2069 | 2460 | 2076 | 2064 | 20 | 2067 | 1996 | 2069 | 20 | 20 | 20 | 0 |
Best forecast wave conditions in Guam | ||||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||||
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