Surf Forecasts:
How big are the waves at Boat Basin Lefts today (21 Aug):
- Morning surf: Morning surf (21 Aug, local time) - 2.5ft (0.7m), 6s period with NE swell.
- Afternoon surf: Afternoon surf (21 Aug, local time) - 3ft (0.9m), 10s period with E swell.
- Evening surf: Evening surf (21 Aug, local time) - 3.5ft (1.0m), 10s period with E swell.
The current surf forecast for Boat Basin Lefts at 10AM is: 0.7m 6s primary swell from a Northeast direction (forecast issued at 03:00am August 21). An open ocean swell of 0.6m 13s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Aug) | 2.5ft (0.7m) | 6s |
| Afternoon (21 Aug) | 3ft (0.9m) | 10s |
| Evening (21 Aug) | 3.5ft (1.0m) | 10s |
Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 30mm), heaviest during Sat night. Warm (max 30°C on Fri afternoon, min 28°C on Fri night). Winds increasing (calm on Fri morning, fresh winds from the SW by Sat night). | ||||||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||||||||||
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 | 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) | NE 6 | NE 6 | NE 6 | NE 6 | E 10 | E 10 | E 10 | E 10 | E 10 | ENE 10 | ENE 9 | NE 10 | NE 10 | NE 10 | NE 10 | NNE 9 | NNE 10 | NNE 10 | NNE 10 | N 10 | N 11 | N 11 | N 11 | N 11 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 51 | 51 | 43 | 42 | 80 | 158 | 148 | 177 | 183 | 150 | 226 | 240 | 246 | 160 | 131 | 108 | 198 | 237 | 265 | 314 | 389 | 394 | 329 | 274 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross | glassy | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 00:13AM0.82m | 4:40PM0.70m | 00:52AM0.79m | 5:59PM0.73m | 1:47AM0.78m | 6:41PM0.76m | ||||||||||||||||||
Low Tide | 8:19AM0.26m | 7:23PM0.69m | 9:20AM0.25m | 9:03PM0.71m | 10:19AM0.22m | |||||||||||||||||||
 | |  |  | | |  |  | | | | |  | | | |  | | | | | |  | | |
 | — | 6:07 | — | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:38 | — | — | — | — | — | — | — | 6:38 | — | — | — | — | — | — | — | 6:37 | — | — |
mm | — | — | — | — | — | — | 1 | — | — | — | — | — | 1 | 1 | — | 2 | 6 | 6 | 1 | 2 | 3 | 2 | — | 1 |
Temp °C | 28 | 27 | 28 | 29 | 29 | 30 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 28 |
Feels °C | 34 | 32 | 33 | 35 | 33 | 34 | 33 | 33 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 29 | 28 | 28 | 30 | 31 | 31 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | E 10 | E 10 | E 10 | E 10 | ENE 10 | SSE 9 | SSE 9 | SSE 9 | S 9 | NE 10 | S 8 | NNE 10 | NNE 10 | NNE 10 | N 10 | N 11 | S 8 | SW 8 | N 11 |
| kJ | 51 | 51 | 43 | 42 | 40 | 158 | 148 | 177 | 183 | 150 | 227 | 243 | 311 | 377 | 131 | 567 | 198 | 237 | 265 | 314 | 389 | 313 | 238 | 274 |
Swell 2 Height (m) Direction Period (s) | WSW 9 | WSW 8 | WSW 8 | ESE 13 | E 10 | NNE 6 | NNE 6 | NNE 6 | SSE 9 | SSE 9 | ENE 9 | NE 10 | NE 10 | NE 10 | WNW 9 | NNE 9 | WNW 8 | E 13 | WNW 8 | ENE 12 | ENE 12 | N 11 | N 11 | SSE 8 |
| kJ | 58 | 53 | 38 | 131 | 80 | 35 | 26 | 26 | 78 | 124 | 226 | 240 | 246 | 160 | 26 | 108 | 13 | 31 | 12 | 30 | 29 | 394 | 329 | 123 |
Swell 3 Height (m) Direction Period (s) | W 8 | ESE 13 | ESE 13 | WSW 8 | WSW 8 | WSW 8 | E 13 | SSE 10 | NNE 8 | NNE 8 | WSW 8 | WNW 8 | WNW 9 | WNW 9 | E 13 | WNW 8 | E 13 | WNW 8 | ENE 13 | WNW 8 | WNW 8 | SE 9 | S 8 | ENE 12 |
| kJ | 34 | 57 | 92 | 38 | 37 | 37 | 119 | 61 | 41 | 45 | 23 | 22 | 27 | 26 | 14 | 23 | 14 | 6 | 33 | 11 | 6 | 128 | 201 | 50 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 3 | SW 7 | — | — | SW 7 | WSW 7 | S 8 | WSW 7 | S 9 | SSW 9 | SSW 9 | SSW 8 | SSW 9 | WSW 9 | — | SSW 8 |
| kJ | — | — | — | — | — | — | — | — | 2 | 2 | — | — | 14 | 10 | 499 | 5 | 653 | 772 | 738 | 737 | 773 | 270 | — | 413 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 2075 | 0 | 11 | 11 | 11 | 11 | 11 | 1996 | 2064 | 1996 | 2426 | 2426 | 2425 | 2275 | 2200 | 231 | 1836 | 1836 | 2064 | 1958 | 1958 | 1836 |
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
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