Surf Forecasts:
How big are the waves at Boat Basin Lefts today (18 Sep):
- Morning surf: Morning surf (18 Sep, local time) - 2.5ft (0.7m), 8s period with NNE swell.
- Afternoon surf: Afternoon surf (18 Sep, local time) - 2.5ft (0.7m), 9s period with NNE swell.
- Evening surf: Evening surf (18 Sep, local time) - 2ft (0.6m), 8s period with N swell.
The current surf forecast for Boat Basin Lefts at 1PM is: 0.7m 9s primary swell from a North-northeast direction and 0.4m 3s secondary swell from a West-southwest direction (forecast issued at 09:00am September 18). An open ocean swell of 1.3m 8s is not directed at the surf break. The wind direction is predicted to be cross-shore.
| Time (ChST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Sep) | 2.5ft (0.7m) | 8s |
| Afternoon (18 Sep) | 2.5ft (0.7m) | 9s |
| Evening (18 Sep) | 2ft (0.6m) | 8s |
Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 35mm), heaviest during Sun night. Warm (max 29°C on Fri morning, min 26°C on Sun night). Wind will be generally light. | ||||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||||||||
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) | NNE 8 | NNE 8 | NNE 9 | NNE 9 | NNE 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 9 | NNW 10 | NNW 10 | NNW 10 | NNW 10 |
Wave Graph  | ||||||||||||||||||||||
 kJ | 99 | 60 | 82 | 77 | 63 | 44 | 45 | 48 | 46 | 46 | 63 | 64 | 86 | 92 | 92 | 94 | 73 | 115 | 157 | 160 | 169 | 135 |
Wind (km/h) | ||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | glassy | glassy | cross | glassy | cross |
High Tide | 2:16PM0.73m | 11:08PM0.78m | 3:51PM0.73m | 11:50PM0.76m | 5:02PM0.75m | |||||||||||||||||
Low Tide | 6:23AM0.24m | 6:07PM0.67m | 7:21AM0.25m | 7:20PM0.70m | 8:25AM0.26m | 9:08PM0.70m | ||||||||||||||||
 | | | |  |  |  | |  | | | | | | | | | | | | | | |
 | 6:09 | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — |
 | — | — | — | 6:20 | — | — | — | — | — | — | — | 6:19 | — | — | — | — | — | — | — | 6:19 | — | — |
mm | 1 | 1 | 2 | 2 | 2 | — | — | — | — | — | 1 | 1 | 1 | 3 | 2 | 3 | 1 | 1 | 3 | 1 | — | 1 |
Temp °C | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 28 |
Feels °C | 32 | 31 | 30 | 30 | 31 | 31 | 30 | 30 | 32 | 32 | 32 | 32 | 33 | 33 | 32 | 32 | 33 | 34 | 34 | 33 | 34 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | WSW 8 | WSW 8 | WSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | WSW 8 | N 8 | WSW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 8 | SW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 8 |
| kJ | 256 | 227 | 227 | 230 | 230 | 212 | 264 | 264 | 264 | 264 | 230 | 64 | 207 | 161 | 136 | 133 | 133 | 131 | 103 | 101 | 101 | 120 |
Swell 2 Height (m) Direction Period (s) | NNE 8 | NNE 8 | NNE 9 | NNE 9 | NNE 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | SE 8 | N 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 9 | NNW 10 | NNW 10 | NNW 10 | NNW 10 |
| kJ | 99 | 60 | 82 | 77 | 63 | 44 | 45 | 48 | 46 | 46 | 63 | 34 | 86 | 92 | 92 | 94 | 73 | 115 | 157 | 160 | 169 | 135 |
Swell 3 Height (m) Direction Period (s) | SSE 7 | SSE 7 | SSE 7 | S 7 | S 7 | S 6 | SE 8 | SE 8 | SE 8 | SE 8 | S 7 | S 6 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | S 6 | NE 10 | NE 11 | NE 11 | NE 11 | NE 10 |
| kJ | 20 | 16 | 15 | 23 | 32 | 29 | 35 | 25 | 18 | 18 | 23 | 11 | 50 | 26 | 26 | 26 | 18 | 50 | 56 | 72 | 90 | 89 |
Wind waves Height (m) Direction Period (s) | — | WSW 2 | WSW 3 | — | — | — | — | — | — | — | — | WSW 8 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | 3 | — | — | — | — | — | — | — | — | 224 | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||
Distance (km) | 11 | 229 | 1908 | 229 | 229 | 16 | 16 | 16 | 16 | 11 | 229 | 16 | 16 | 11 | 16 | 16 | 0 | 0 | 0 | 3 | 0 | 11 |
Best forecast wave conditions in Guam | ||||||||||||||||||||||
Best forecast wave conditions in Guam | ||||||||||||||||||||||
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