This is an unofficial forecast. The aim is to help people with their forward planning. Current wave height calculations don’t take into account the different fetches for different wind directions, nor does it take into account the duration of the wind.
Always check with CalMac for the details of the service between Brodick and Ardrossan, or Lochranza and Claonaig / Tarbert.
| Brodick - Normal service | Lochranza - Normal service | ||||||
| Thursday 1st December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 13:00 | Should be fine | 5.09ft | SSW | 16 mph | 16 mph |  |
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| 14:00 | Should be fine | 5.05ft | SSW | 15 mph | 15 mph | |
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| 15:00 | Should be fine | 5.02ft | SSW | 14 mph | 14 mph | |
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| 16:00 | Should be fine | 4.91ft | S | 12 mph | 12 mph | |
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| 17:00 | Should be fine | 4.91ft | S | 12 mph | 12 mph | |
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| 18:00 | Should be fine | 4.91ft | S | 12 mph | 12 mph | |
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| 19:00 | Should be fine | 4.95ft | S | 13 mph | 13 mph | |
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| 20:00 | Should be fine | 5.02ft | S | 14 mph | 14 mph | |
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| 21:00 | Should be fine | 5.02ft | S | 14 mph | 14 mph | |
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| 22:00 | Should be fine | 5.03ft | S | 15 mph | 15 mph | |
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| 23:00 | Should be fine | 5.09ft | S | 16 mph | 16 mph | |
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| Friday 2nd December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Possibly Ardrossan | 5.1ft | S | 16 mph | 16 mph | |
|
| 01:00 | Possibly Ardrossan | 5.1ft | S | 16 mph | 16 mph |  |
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| 02:00 | Should be fine | 5.09ft | SSE | 16 mph | 16 mph | |
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| 03:00 | Possibly Ardrossan | 5.11ft | S | 16 mph | 16 mph | |
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| 04:00 | Should be fine | 5.06ft | S | 15 mph | 15 mph | |
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| 05:00 | Should be fine | 5.04ft | S | 15 mph | 15 mph | |
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| 06:00 | Should be fine | 4.96ft | SSE | 13 mph | 13 mph |  |
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| 07:00 | Should be fine | 4.93ft | SSE | 13 mph | 13 mph | |
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| 08:00 | Should be fine | 4.93ft | SSE | 13 mph | 13 mph | |
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| 09:00 | Should be fine | 4.89ft | SE | 12 mph | 12 mph | |
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| 10:00 | Should be fine | 4.79ft | SE | 10 mph | 10 mph |  |
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| 11:00 | Should be fine | 4.67ft | SSE | 9 mph | 9 mph | |
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| 12:00 | Should be fine | 4.48ft | SE | 7 mph | 7 mph | |
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| 13:00 | Should be fine | 4.32ft | SE | 5 mph | 5 mph | |
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| 14:00 | Should be fine | 4.38ft | ESE | 6 mph | 6 mph | |
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| 15:00 | Should be fine | 4.48ft | ESE | 7 mph | 7 mph | |
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| 16:00 | Should be fine | 4.43ft | ESE | 6 mph | 6 mph | |
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| 17:00 | Should be fine | 4.59ft | ESE | 8 mph | 8 mph | |
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| 18:00 | Should be fine | 4.7ft | ESE | 9 mph | 9 mph | |
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| 19:00 | Should be fine | 4.7ft | SE | 9 mph | 9 mph | |
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| 20:00 | Should be fine | 4.63ft | SE | 8 mph | 8 mph | |
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| 21:00 | Should be fine | 4.5ft | SE | 7 mph | 7 mph | |
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| 22:00 | Should be fine | 4.46ft | SE | 6 mph | 6 mph | |
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| 23:00 | Should be fine | 4.55ft | ESE | 7 mph | 7 mph | |
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| Saturday 3rd December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Should be fine | 4.63ft | ESE | 8 mph | 8 mph | |
|
| 01:00 | Should be fine | 4.75ft | ESE | 10 mph | 10 mph | |
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| 02:00 | Should be fine | 4.82ft | ESE | 11 mph | 11 mph | |
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| 03:00 | Should be fine | 4.82ft | ESE | 11 mph | 11 mph | |
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| 04:00 | Should be fine | 4.84ft | ESE | 11 mph | 11 mph |  |
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| 05:00 | Should be fine | 4.84ft | ESE | 11 mph | 11 mph | |
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| 06:00 | Should be fine | 4.8ft | ESE | 11 mph | 11 mph | |
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| 07:00 | Should be fine | 4.77ft | ESE | 10 mph | 10 mph | |
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| 08:00 | Should be fine | 4.82ft | ESE | 11 mph | 11 mph | |
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| 09:00 | Should be fine | 4.83ft | ESE | 11 mph | 11 mph | |
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| 10:00 | Should be fine | 4.8ft | ESE | 11 mph | 11 mph |  |
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| 11:00 | Should be fine | 4.72ft | ESE | 9 mph | 9 mph | |
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| 12:00 | Should be fine | 4.69ft | SE | 9 mph | 9 mph | |
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| 13:00 | Should be fine | 4.63ft | SE | 8 mph | 8 mph | |
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| 14:00 | Should be fine | 4.65ft | SE | 9 mph | 9 mph | |
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| 15:00 | Should be fine | 4.7ft | SE | 9 mph | 9 mph | |
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| 16:00 | Should be fine | 4.77ft | ESE | 10 mph | 10 mph | |
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| 17:00 | Should be fine | 4.82ft | ESE | 11 mph | 11 mph | |
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| 18:00 | Should be fine | 4.86ft | ESE | 11 mph | 11 mph | |
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| 19:00 | Should be fine | 4.84ft | ESE | 11 mph | 11 mph | |
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| 20:00 | Should be fine | 4.84ft | ENE | 11 mph | 11 mph | |
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| 21:00 | Should be fine | 4.93ft | ENE | 13 mph | 13 mph | |
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| 22:00 | Should be fine | 4.99ft | ENE | 14 mph | 14 mph | |
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| 23:00 | Should be fine | 4.97ft | ENE | 13 mph | 13 mph | |
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| Sunday 4th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Should be fine | 5.01ft | ENE | 14 mph | 14 mph |  |
|
| 06:00 | Should be fine | 5.01ft | ENE | 14 mph | 14 mph | |
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| 12:00 | Should be fine | 5.04ft | ENE | 15 mph | 15 mph | |
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| 18:00 | Possibly Brodick | 5.15ft | NE | 17 mph | 17 mph | |
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| Monday 5th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Possibly Brodick | 5.12ft | NE | 17 mph | 17 mph | |
|
| 06:00 | Should be fine | 5.09ft | NE | 16 mph | 16 mph | |
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| 12:00 | Possibly Brodick | 5.15ft | NE | 17 mph | 17 mph | |
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| 18:00 | Possibly Brodick | 5.22ft | NE | 19 mph | 19 mph | |
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| Tuesday 6th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Possibly Brodick | 5.12ft | NE | 17 mph | 17 mph | |
|
| 06:00 | Possibly Brodick | 5.15ft | NE | 17 mph | 17 mph | |
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| 12:00 | Should be fine | 5.06ft | NE | 15 mph | 15 mph | |
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| 18:00 | Should be fine | 4.93ft | NNE | 13 mph | 13 mph | |
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| Wednesday 7th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Should be fine | 4.82ft | N | 11 mph | 11 mph | |
|
| 06:00 | Should be fine | 5.1ft | N | 16 mph | 16 mph |  |
|
| 12:00 | Should be fine | 4.97ft | N | 13 mph | 13 mph | |
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| 18:00 | Should be fine | 4.96ft | NNW | 13 mph | 13 mph | |
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| Thursday 8th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Should be fine | 5.04ft | NW | 15 mph | 15 mph | |
|
| 06:00 | Should be fine | 5ft | NW | 14 mph | 14 mph | |
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| 12:00 | Should be fine | 4.55ft | WSW | 7 mph | 7 mph | |
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| 18:00 | Probably Ardrossan | 5.47ft | SSW | 27 mph | 27 mph |  |
|
| Friday 9th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Probably Ardrossan | 5.39ft | WNW | 24 mph | 24 mph |  |
|
| 06:00 | Should be fine | 4.95ft | NW | 13 mph | 13 mph | |
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| 12:00 | Possibly Ardrossan | 5.21ft | WSW | 19 mph | 19 mph | |
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| 18:00 | Possibly Ardrossan | 5.2ft | NW | 18 mph | 18 mph | |
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| Saturday 10th December | |||||||
| Time | Port Affected? | Waves | Dir | Wind | Gust | Sea Temp. | Fog |
| 00:00 | Should be fine | 5.06ft | W | 15 mph | 15 mph | |
|
| 06:00 | Should be fine | 4.91ft | WSW | 12 mph | 12 mph | |
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| 12:00 | Should be fine | 4.23ft | W | 5 mph | 5 mph | |
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Just for fun! Always check with CalMac regarding the actual status of your sailings.