Surf Forecasts:
How big are the waves at Boat Basin Lefts today (20 Sep):
- Afternoon surf: Afternoon surf (20 Sep, local time) - 3.5ft (1.0m), 10s period with NNW swell.
- Evening surf: Evening surf (20 Sep, local time) - 3ft (0.9m), 10s period with NNW swell.
The current surf forecast for Boat Basin Lefts at 10PM is: 0.9m 10s primary swell from a North-northwest direction (forecast issued at 03:00pm September 20). An open ocean swell of 1.0m 8s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Sep) | - | - |
| Afternoon (20 Sep) | 3.5ft (1.0m) | 10s |
| Evening (20 Sep) | 3ft (0.9m) | 10s |
Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 70mm), heaviest during Tue afternoon. Warm (max 29°C on Sun afternoon, min 25°C on Tue afternoon). Winds increasing (calm on Mon morning, strong winds from the SE by Tue morning). | ||||||||||||||||||||
Sun 20 | Monday 21 | Tuesday 22 | ||||||||||||||||||
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 | 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 |
Wave Graph  | ||||||||||||||||||||
 kJ | 236 | 218 | 176 | 173 | 140 | 186 | 198 | 160 | 140 | 142 | 137 | 121 | 145 | 160 | 166 | 135 | 133 | 135 | 135 | 184 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off |
High Tide | 5:02PM0.75m | 00:58AM0.74m | 5:44PM0.77m | 2:29AM0.73m | 6:12PM0.80m | |||||||||||||||
Low Tide | 9:08PM0.70m | 9:29AM0.26m | 10:30PM0.68m | 10:26AM0.25m | ||||||||||||||||
 | |  |  | | | | |  | | | | | | | | |  | |  | |
 | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — |
 | — | 6:19 | — | — | — | — | — | — | — | 6:17 | — | — | — | — | — | — | — | 6:16 | — | — |
mm | 4 | 8 | 2 | — | — | 2 | 4 | 1 | — | 1 | — | — | — | 4 | 3 | 2 | 4 | 7 | 14 | 7 |
Temp °C | 29 | 28 | 29 | 29 | 28 | 28 | 26 | 27 | 28 | 28 | 28 | 27 | 27 | 27 | 28 | 27 | 27 | 25 | 26 | 26 |
Feels °C | 34 | 32 | 34 | 34 | 32 | 32 | 29 | 31 | 32 | 32 | 32 | 31 | 30 | 28 | 27 | 25 | 25 | 23 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 8 | NNW 10 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | NNW 10 | SW 7 | SW 7 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 12 |
| kJ | 116 | 218 | 113 | 111 | 108 | 105 | 118 | 89 | 86 | 109 | 65 | 63 | 145 | 160 | 166 | 135 | 133 | 135 | 135 | 184 |
Swell 2 Height (m) Direction Period (s) | NNW 10 | WSW 8 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | SW 7 | NNW 10 | NE 11 | SSW 7 | SW 7 | NE 11 | NE 10 | NE 10 | SW 8 | SW 8 | NE 10 |
| kJ | 236 | 101 | 176 | 173 | 140 | 186 | 198 | 160 | 140 | 59 | 109 | 121 | 56 | 45 | 90 | 89 | 82 | 60 | 36 | 47 |
Swell 3 Height (m) Direction Period (s) | NE 11 | NE 11 | NE 11 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 12 | NE 12 | NNW 10 | NE 11 | NE 11 | SW 7 | SW 7 | SW 7 | NE 10 | NE 10 | E 13 |
| kJ | 56 | 72 | 90 | 89 | 84 | 79 | 79 | 79 | 79 | 142 | 137 | 81 | 119 | 92 | 22 | 38 | 33 | 63 | 48 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SW 7 | — | — | — | — | — | — | SSE 8 | SE 4 | SSE 6 | SE 6 | SE 6 | SE 6 | SSE 7 | S 7 |
| kJ | — | — | — | — | — | 152 | — | — | — | — | — | — | 58 | 21 | 84 | 184 | 228 | 303 | 374 | 475 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 11 | 11 | 11 | 2064 | 0 | 24 | 7 | 0 | 0 | 0 | 0 | 0 | 2064 | 1836 | 1836 | 1290 | 1290 | 1290 | 1290 |
Best forecast wave conditions in Guam | ||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||
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