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.

Tue 2nd
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
18:00
Should be fine
8mph
NW
2.16ft
19:00
Should be fine
8mph
NW
2.16ft
20:00
Should be fine
8mph
N
2.16ft
21:00
Should be fine
7mph
NW
1.77ft
22:00
Should be fine
8mph
NW
2.16ft
23:00
Should be fine
9mph
NW
2.49ft
Wed 3rd
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
10mph
N
2.79ft
01:00
Should be fine
12mph
N
3.31ft
02:00
Should be fine
15mph
NE
3.94ft
03:00
Should be fine
13mph
NE
3.54ft
04:00
Should be fine
13mph
NE
3.54ft
05:00
Should be fine
13mph
NE
3.54ft
06:00
Should be fine
13mph
NE
3.54ft
07:00
Should be fine
13mph
N
3.54ft
08:00
Should be fine
12mph
N
3.31ft
09:00
Should be fine
11mph
N
3.06ft
10:00
Should be fine
10mph
N
2.79ft
11:00
Should be fine
10mph
N
2.79ft
12:00
Should be fine
10mph
N
2.79ft
13:00
Should be fine
11mph
N
3.06ft
14:00
Should be fine
11mph
N
3.06ft
15:00
Should be fine
10mph
N
2.79ft
16:00
Should be fine
12mph
NW
3.31ft
17:00
Should be fine
14mph
NW
3.75ft
18:00
Should be fine
16mph
NW
4.13ft
19:00
Should be fine
17mph
NW
4.3ft
20:00
Should be fine
15mph
NW
3.94ft
21:00
Should be fine
15mph
N
3.94ft
22:00
Should be fine
15mph
N
3.94ft
23:00
Should be fine
13mph
N
3.54ft
Thu 4th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
14mph
N
3.75ft
01:00
Should be fine
13mph
NW
3.54ft
02:00
Should be fine
11mph
NW
3.06ft
03:00
Should be fine
9mph
NW
2.49ft
04:00
Should be fine
8mph
NW
2.16ft
05:00
Should be fine
8mph
NW
2.16ft
06:00
Should be fine
9mph
NW
2.49ft
07:00
Should be fine
10mph
NW
2.79ft
08:00
Should be fine
10mph
NW
2.79ft
09:00
Should be fine
9mph
NW
2.49ft
10:00
Should be fine
9mph
NW
2.49ft
11:00
Should be fine
9mph
NW
2.49ft
12:00
Should be fine
9mph
NW
2.49ft
13:00
Should be fine
10mph
NW
2.79ft
14:00
Should be fine
11mph
NW
3.06ft
15:00
Should be fine
11mph
NW
3.06ft
16:00
Should be fine
13mph
NW
3.54ft
17:00
Should be fine
12mph
NW
3.31ft
18:00
Should be fine
12mph
NW
3.31ft
19:00
Should be fine
12mph
NW
3.31ft
20:00
Should be fine
12mph
NW
3.31ft
21:00
Should be fine
11mph
NW
3.06ft
22:00
Should be fine
11mph
NW
3.06ft
23:00
Should be fine
11mph
NW
3.06ft
Fri 5th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
11mph
NW
3.06ft
01:00
Should be fine
10mph
NW
2.79ft
02:00
Should be fine
9mph
NW
2.49ft
03:00
Should be fine
9mph
NW
2.49ft
04:00
Should be fine
9mph
NW
2.49ft
05:00
Should be fine
9mph
NW
2.49ft
06:00
Should be fine
10mph
NW
2.79ft
12:00
Should be fine
15mph
NW
3.94ft
18:00
Should be fine
18mph
NW
4.46ft
Sat 6th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
17mph
NW
4.3ft
06:00
Should be fine
26mph
NW
5.51ft
12:00
Should be fine
25mph
NW
5.4ft
18:00
Should be fine
20mph
NW
4.77ft
Sun 7th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
8mph
N
2.16ft
06:00
Should be fine
12mph
N
3.31ft
12:00
Should be fine
15mph
NW
3.94ft
18:00
Should be fine
15mph
NW
3.94ft
Mon 8th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
15mph
NW
3.94ft
06:00
Should be fine
10mph
N
2.79ft
12:00
Should be fine
6mph
NW
1.34ft
18:00
Should be fine
13mph
NW
3.54ft
Tue 9th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
12mph
NW
3.31ft
06:00
Should be fine
9mph
NW
2.49ft
12:00
Should be fine
5mph
S
0.83ft
18:00
Should be fine
8mph
SW
2.16ft
Wed 10th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
3mph
N
Calm
06:00
Should be fine
7mph
NE
1.77ft
12:00
Should be fine
2mph
SE
Calm
18:00
Should be fine
4mph
S
Calm
Thu 11th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
6mph
NE
1.34ft
06:00
Should be fine
15mph
NE
3.94ft
12:00
Should be fine
14mph
NE
3.75ft
18:00
Should be fine
13mph
NE
3.54ft

Just for fun! Always check with CalMac regarding the actual status of your sailings.