Surf Forecasts:
How big are the waves at Boat Basin Lefts today (21 Sep):
- Morning surf: Morning surf (21 Sep, local time) - 3ft (0.9m), 10s period with NNW swell.
- Afternoon surf: Afternoon surf (21 Sep, local time) - 2.5ft (0.8m), 10s period with NNW swell.
- Evening surf: Evening surf (21 Sep, local time) - 2.5ft (0.7m), 11s period with NE swell.
The current surf forecast for Boat Basin Lefts at 12PM is: 0.9m 10s primary swell from a North-northwest direction (forecast issued at 03:00am September 21). An open ocean swell of 0.8m 7s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Sep) | 3ft (0.9m) | 10s |
| Afternoon (21 Sep) | 2.5ft (0.8m) | 10s |
| Evening (21 Sep) | 2.5ft (0.7m) | 11s |
Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 55mm), heaviest during Mon morning. Warm (max 29°C on Mon afternoon, min 25°C on Wed afternoon). Winds increasing (calm on Mon morning, strong winds from the SE by Tue afternoon). | ||||||||||||||||||||||||
Monday 21 | Tuesday 22 | Wednesday 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) | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NE 12 | NE 12 | NE 11 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 12 | NNW 12 | NNW 12 | NNW 12 | NNW 12 | NNW 12 | NNW 12 | NNW 11 | NNW 11 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 140 | 186 | 198 | 157 | 154 | 142 | 137 | 121 | 148 | 130 | 135 | 135 | 133 | 135 | 135 | 184 | 233 | 233 | 278 | 274 | 269 | 215 | 204 | 193 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | glassy | cross-on | glassy | off | off | off | off | off | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off |
High Tide | 00:58AM0.74m | 5:44PM0.77m | 2:29AM0.73m | 6:12PM0.80m | 3:53AM0.75m | 6:34PM0.82m | ||||||||||||||||||
Low Tide | 9:29AM0.26m | 10:30PM0.68m | 10:26AM0.25m | 11:22PM0.64m | 11:14AM0.25m | |||||||||||||||||||
 | |  | | |  |  | |  | | | | | | | | | | |  | | | | | |
 | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:17 | — | — | — | — | — | — | — | 6:16 | — | — | — | — | — | — | — | 6:16 | — | — |
mm | 1 | 2 | 3 | 5 | 1 | — | — | — | — | 2 | 1 | 1 | 5 | 5 | 4 | 5 | 3 | 1 | 1 | 2 | 3 | 4 | 4 | 3 |
Temp °C | 28 | 28 | 28 | 27 | 28 | 29 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 |
Feels °C | 33 | 33 | 33 | 31 | 33 | 33 | 30 | 29 | 29 | 28 | 26 | 25 | 26 | 26 | 26 | 27 | 26 | 27 | 27 | 28 | 30 | 28 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 7 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | SW 7 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | S 8 | SSW 7 | SSW 7 | NNW 12 | NNW 12 | NNW 12 | SW 7 | SW 7 | SW 7 | SW 7 |
| kJ | 108 | 105 | 198 | 157 | 154 | 122 | 109 | 47 | 148 | 130 | 135 | 135 | 133 | 135 | 265 | 135 | 86 | 233 | 278 | 274 | 102 | 135 | 139 | 131 |
Swell 2 Height (m) Direction Period (s) | NNW 10 | NNW 10 | SW 7 | SW 7 | WSW 7 | SW 7 | SW 7 | NE 11 | NE 11 | NE 11 | SW 7 | NE 10 | NE 10 | NE 10 | NNW 10 | NNW 12 | NNW 12 | SW 7 | NE 10 | NE 9 | NNW 12 | NNW 12 | NNW 11 | NNW 11 |
| kJ | 140 | 186 | 91 | 89 | 66 | 51 | 49 | 121 | 94 | 92 | 23 | 89 | 82 | 80 | 135 | 184 | 233 | 59 | 45 | 42 | 269 | 215 | 204 | 193 |
Swell 3 Height (m) Direction Period (s) | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 12 | NE 12 | NNW 10 | WSW 7 | WSW 7 | SW 7 | WSW 7 | WSW 7 | E 13 | NE 10 | NE 10 | NE 10 | NE 10 | SSE 8 | SSE 8 | SSE 6 | SSE 6 | SSE 8 | NE 9 |
| kJ | 84 | 79 | 79 | 79 | 79 | 142 | 137 | 81 | 31 | 31 | 12 | 18 | 18 | 3 | 48 | 47 | 47 | 46 | 26 | 26 | 33 | 33 | 40 | 41 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | ESE 3 | SE 5 | SE 6 | ESE 7 | SE 7 | SE 6 | S 7 | SE 5 | SE 5 | SE 6 | SSE 6 | S 7 | SSW 7 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 3 | 68 | 188 | 458 | 415 | 161 | 315 | 59 | 143 | 212 | 93 | 154 | 135 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 15 | 0 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 1290 | 1290 | 1907 | 1290 | 1905 | 1290 | 1290 | 1290 | 1290 | 1290 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
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