Surf Forecasts:
How big are the waves at Boat Basin Lefts today (21 Sep):
- 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 10PM is: 0.7m 11s primary swell from a Northeast direction (forecast issued at 03:00pm September 21). An open ocean swell of 0.7m 7s is not directed at the surf break, a second open ocean swell of 0.7m 8s is not directed at the surf break. The wind direction is predicted to be offshore and the swell rating is 2.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Sep) | - | - |
| 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 25mm), heaviest during Tue afternoon. Warm (max 29°C on Mon afternoon, min 27°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Mon 21 | Tuesday 22 | Wednesday 23 | ||||||||||||||||||
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 | 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 | 154 | 142 | 137 | 121 | 148 | 160 | 166 | 135 | 133 | 133 | 133 | 226 | 233 | 283 | 278 | 274 | 269 | 260 | 204 | 193 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:44PM0.77m | 2:29AM0.73m | 6:12PM0.80m | 3:53AM0.75m | 6:34PM0.82m | |||||||||||||||
Low Tide | 10:30PM0.68m | 10:26AM0.25m | 11:22PM0.64m | 11:14AM0.25m | ||||||||||||||||
 |  |  | |  |  | | | |  | | | | | | | | | | | |
 | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — |
 | — | 6:17 | — | — | — | — | — | — | — | 6:16 | — | — | — | — | — | — | — | 6:16 | — | — |
mm | 1 | — | — | — | — | 1 | 1 | 1 | 1 | — | 3 | 2 | 2 | 1 | 1 | 3 | 3 | 2 | 1 | — |
Temp °C | 29 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 32 | 31 | 30 | 30 | 30 | 28 | 29 | 29 | 28 | 30 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 30 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | NNW 10 | NNW 10 | NNW 10 | 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 | SW 7 |
| kJ | 154 | 122 | 109 | 121 | 148 | 160 | 166 | 135 | 133 | 133 | 133 | 226 | 233 | 283 | 278 | 274 | 269 | 260 | 204 | 205 |
Swell 2 Height (m) Direction Period (s) | WSW 7 | SW 7 | SW 7 | SW 7 | NE 11 | NE 11 | NE 11 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NE 9 | NE 9 | NE 9 | NE 9 | NNW 11 |
| kJ | 66 | 51 | 49 | 47 | 94 | 92 | 90 | 89 | 82 | 80 | 61 | 47 | 47 | 46 | 45 | 42 | 41 | 41 | 41 | 193 |
Swell 3 Height (m) Direction Period (s) | NE 10 | NE 12 | NE 12 | NNW 10 | SW 7 | SW 7 | WSW 7 | WSW 7 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | NE 9 |
| kJ | 79 | 142 | 137 | 81 | 37 | 36 | 31 | 17 | 16 | 16 | 16 | 17 | 26 | 17 | 26 | 16 | 17 | 16 | 15 | 41 |
Wind waves Height (m) Direction Period (s) | SSE 6 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 5 | S 6 | S 6 | S 6 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SW 7 | — |
| kJ | 6 | 53 | 37 | 56 | 73 | 26 | 64 | 92 | 115 | 152 | 173 | 178 | 162 | 149 | 204 | 216 | 198 | 218 | 229 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 2064 | 0 | 0 | 1290 | 229 | 1290 | 1290 | 1290 | 1905 | 1290 | 7 | 1290 | 1290 | 229 | 229 | 229 | 229 | 229 | 229 |
Best forecast wave conditions in Guam | ||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||
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