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.

Wed 5th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
14:00
Should be fine
8mph
S
2.16ft
85%
15:00
Should be fine
3mph
NW
Calm
76%
16:00
Should be fine
11mph
NW
3.06ft
2%
17:00
Should be fine
11mph
W
3.06ft
1%
18:00
Should be fine
10mph
W
2.79ft
19:00
Should be fine
10mph
W
2.79ft
20:00
Should be fine
9mph
W
2.49ft
21:00
Should be fine
7mph
NW
1.77ft
22:00
Should be fine
6mph
W
1.34ft
23:00
Should be fine
5mph
W
0.83ft
Thu 6th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
4mph
W
Calm
1%
01:00
Should be fine
4mph
W
Calm
02:00
Should be fine
3mph
W
Calm
03:00
Should be fine
2mph
SE
Calm
04:00
Should be fine
4mph
SE
Calm
05:00
Should be fine
4mph
S
Calm
06:00
Should be fine
5mph
SE
0.83ft
07:00
Should be fine
5mph
SE
0.83ft
08:00
Should be fine
6mph
SE
1.34ft
09:00
Should be fine
8mph
SE
2.16ft
10:00
Should be fine
8mph
SE
2.16ft
11:00
Should be fine
11mph
SE
3.06ft
12:00
Should be fine
13mph
S
3.54ft
13:00
Should be fine
16mph
S
4.13ft
14:00
Should be fine
17mph
S
4.3ft
15:00
Should be fine
17mph
S
4.3ft
16:00
Should be fine
17mph
S
4.3ft
17:00
Should be fine
17mph
S
4.3ft
18:00
Should be fine
16mph
S
4.13ft
19:00
Should be fine
15mph
S
3.94ft
20:00
Should be fine
14mph
S
3.75ft
21:00
Should be fine
14mph
S
3.75ft
22:00
Should be fine
13mph
S
3.54ft
23:00
Should be fine
12mph
S
3.31ft
Fri 7th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
12mph
S
3.31ft
01:00
Should be fine
13mph
S
3.54ft
02:00
Should be fine
12mph
S
3.31ft
03:00
Should be fine
12mph
S
3.31ft
04:00
Should be fine
13mph
S
3.54ft
05:00
Should be fine
12mph
S
3.31ft
06:00
Should be fine
13mph
S
3.54ft
07:00
Should be fine
13mph
S
3.54ft
08:00
Should be fine
15mph
S
3.94ft
09:00
Should be fine
17mph
S
4.3ft
10:00
Possibly affecting Ardrossan
18mph
S
4.46ft
76%
11:00
Should be fine
17mph
S
4.3ft
12:00
Should be fine
16mph
S
4.13ft
13:00
Should be fine
17mph
S
4.3ft
14:00
Possibly affecting Ardrossan
18mph
S
4.46ft
15:00
Should be fine
17mph
S
4.3ft
59%
16:00
Should be fine
16mph
S
4.13ft
71%
17:00
Should be fine
15mph
S
3.94ft
85%
18:00
Should be fine
13mph
S
3.54ft
85%
19:00
Should be fine
14mph
W
3.75ft
20:00
Should be fine
12mph
NW
3.31ft
21:00
Should be fine
12mph
NW
3.31ft
22:00
Should be fine
10mph
NW
2.79ft
23:00
Should be fine
9mph
NW
2.49ft
Sat 8th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
9mph
NW
2.49ft
06:00
Should be fine
4mph
NW
Calm
12:00
Should be fine
5mph
NW
0.83ft
18:00
Should be fine
8mph
N
2.16ft
Sun 9th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
9mph
N
2.49ft
06:00
Should be fine
13mph
NE
3.54ft
12:00
Should be fine
11mph
NE
3.06ft
18:00
Should be fine
13mph
NE
3.54ft
Mon 10th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
13mph
NE
3.54ft
06:00
Should be fine
14mph
NE
3.75ft
12:00
Should be fine
13mph
NE
3.54ft
18:00
Should be fine
11mph
NE
3.06ft
Tue 11th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
12mph
NE
3.31ft
06:00
Should be fine
8mph
NE
2.16ft
12:00
Should be fine
7mph
NE
1.77ft
18:00
Should be fine
6mph
N
1.34ft
Wed 12th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
7mph
N
1.77ft
06:00
Should be fine
7mph
N
1.77ft
12:00
Should be fine
6mph
NE
1.34ft
18:00
Should be fine
9mph
NW
2.49ft
Thu 13th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
8mph
NW
2.16ft
06:00
Should be fine
9mph
N
2.49ft
12:00
Should be fine
8mph
N
2.16ft
18:00
Should be fine
8mph
N
2.16ft
Fri 14th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
10mph
NE
2.79ft
06:00
Should be fine
12mph
N
3.31ft
12:00
Should be fine
11mph
NE
3.06ft
18:00
Should be fine
10mph
NE
2.79ft

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