Surf Forecasts:
How big are the waves at Boat Basin Lefts today (20 Sep):
- Morning surf: Morning surf (20 Sep, local time) - 2.5ft (0.8m), 9s period with NNW swell.
- 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 10AM is: 0.9m 10s primary swell from a North-northwest direction (forecast issued at 03:00am September 20). An open ocean swell of 1.1m 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) | 2.5ft (0.8m) | 9s |
| 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 34mm), heaviest during Sun afternoon. Warm (max 29°C on Sun morning, min 26°C on Mon morning). Winds increasing (calm on Mon morning, fresh winds from the SE by Tue morning). | ||||||||||||||||||||||||
Sunday 20 | Monday 21 | Tuesday 22 | ||||||||||||||||||||||
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 8 | NNW 8 | NNW 8 | NNW 10 | 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 13 | NNW 13 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 90 | 92 | 72 | 157 | 236 | 218 | 176 | 173 | 140 | 186 | 198 | 157 | 154 | 142 | 137 | 121 | 145 | 160 | 133 | 163 | 133 | 166 | 304 | 357 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | glassy | cross-on | cross-on | glassy | glassy | glassy | glassy | glassy | glassy | cross-off | glassy | glassy | cross-off | cross-off | off | off | off | off | off | off | off | off |
High Tide | 11:50PM0.76m | 5:02PM0.75m | 00:58AM0.74m | 5:44PM0.77m | 2:29AM0.73m | 6:12PM0.80m | ||||||||||||||||||
Low Tide | 8:25AM0.26m | 9:08PM0.70m | 9:29AM0.26m | 10:30PM0.68m | 10:26AM0.25m | |||||||||||||||||||
 |  |  | |  | | | |  | |  | | |  | | | | | | | | |  | | |
 | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:19 | — | — | — | — | — | — | — | 6:17 | — | — | — | — | — | — | — | 6:16 | — | — |
mm | 1 | — | — | — | 2 | 9 | 2 | 1 | — | 5 | — | 1 | — | — | 1 | — | — | 2 | 1 | 2 | 1 | — | — | — |
Temp °C | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 27 | 27 | 28 | 28 | 26 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 33 | 32 | 33 | 33 | 33 | 32 | 33 | 32 | 32 | 33 | 33 | 29 | 32 | 33 | 32 | 31 | 31 | 30 | 30 | 29 | 27 | 27 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | NNW 10 | SW 8 | NNW 10 | SW 8 | SW 7 | NNW 10 | NNW 10 | NNW 10 | SW 7 | NNW 10 | SW 7 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 13 | NNW 13 |
| kJ | 151 | 182 | 177 | 135 | 116 | 218 | 113 | 173 | 108 | 105 | 198 | 157 | 154 | 60 | 109 | 65 | 145 | 160 | 133 | 163 | 133 | 166 | 304 | 357 |
Swell 2 Height (m) Direction Period (s) | NNW 8 | NNW 8 | NNW 8 | NNW 10 | NNW 10 | WSW 8 | NNW 10 | WSW 8 | NNW 10 | NNW 10 | SW 7 | WSW 7 | SW 7 | NNW 10 | SW 7 | NE 11 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 |
| kJ | 90 | 92 | 72 | 157 | 236 | 101 | 176 | 91 | 140 | 186 | 79 | 68 | 75 | 109 | 49 | 121 | 54 | 44 | 45 | 45 | 60 | 62 | 64 | 48 |
Swell 3 Height (m) Direction Period (s) | SSE 8 | NE 10 | NE 10 | NE 10 | 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 | NE 11 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 |
| kJ | 26 | 36 | 50 | 50 | 56 | 72 | 90 | 89 | 84 | 79 | 79 | 79 | 79 | 142 | 137 | 81 | 94 | 92 | 90 | 87 | 82 | 80 | 48 | 47 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SSE 6 | SSE 8 | — | — | — | — | — | — | ESE 3 | E 3 | E 4 | SE 5 | SE 6 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 10 | 39 | — | — | — | — | — | — | 2 | 8 | 18 | 84 | 143 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 11 | 0 | 11 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1905 | 1905 | 1290 | 1290 |
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||||||
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