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.

Thu 21st
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
05:00
Should be fine
5mph
NW
0.83ft
17%
06:00
Should be fine
9mph
NW
2.49ft
5%
07:00
Should be fine
12mph
NW
3.31ft
08:00
Should be fine
12mph
NW
3.31ft
20%
09:00
Should be fine
13mph
NW
3.54ft
10:00
Should be fine
16mph
NW
4.13ft
11:00
Should be fine
19mph
NW
4.62ft
12:00
Should be fine
20mph
NW
4.77ft
13:00
Should be fine
20mph
NW
4.77ft
14:00
Should be fine
20mph
NW
4.77ft
15:00
Should be fine
19mph
NW
4.62ft
16:00
Should be fine
18mph
NW
4.46ft
17:00
Should be fine
18mph
NW
4.46ft
18:00
Should be fine
17mph
NW
4.3ft
19:00
Should be fine
17mph
NW
4.3ft
20:00
Should be fine
19mph
NW
4.62ft
21:00
Should be fine
18mph
NW
4.46ft
22:00
Should be fine
19mph
NW
4.62ft
23:00
Should be fine
17mph
NW
4.3ft
Fri 22nd
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
17mph
NW
4.3ft
01:00
Should be fine
17mph
NW
4.3ft
02:00
Should be fine
16mph
NW
4.13ft
03:00
Should be fine
16mph
NW
4.13ft
04:00
Should be fine
14mph
NW
3.75ft
05:00
Should be fine
15mph
NW
3.94ft
06:00
Should be fine
13mph
NW
3.54ft
07:00
Should be fine
13mph
NW
3.54ft
08:00
Should be fine
12mph
NW
3.31ft
09:00
Should be fine
9mph
NW
2.49ft
10:00
Should be fine
12mph
NW
3.31ft
11:00
Should be fine
10mph
NW
2.79ft
12:00
Should be fine
12mph
NW
3.31ft
13:00
Should be fine
12mph
W
3.31ft
14:00
Should be fine
10mph
NW
2.79ft
15:00
Should be fine
9mph
W
2.49ft
16:00
Should be fine
9mph
W
2.49ft
17:00
Should be fine
8mph
NW
2.16ft
18:00
Should be fine
6mph
NW
1.34ft
19:00
Should be fine
8mph
NW
2.16ft
20:00
Should be fine
7mph
NW
1.77ft
21:00
Should be fine
8mph
NW
2.16ft
22:00
Should be fine
8mph
NW
2.16ft
23:00
Should be fine
8mph
NW
2.16ft
Sat 23rd
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
7mph
NW
1.77ft
01:00
Should be fine
6mph
NW
1.34ft
02:00
Should be fine
7mph
NW
1.77ft
03:00
Should be fine
7mph
NW
1.77ft
04:00
Should be fine
6mph
NW
1.34ft
05:00
Should be fine
8mph
NW
2.16ft
06:00
Should be fine
8mph
NW
2.16ft
07:00
Should be fine
9mph
NW
2.49ft
08:00
Should be fine
9mph
NW
2.49ft
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
13mph
NW
3.54ft
13:00
Should be fine
14mph
W
3.75ft
14:00
Should be fine
13mph
W
3.54ft
15:00
Should be fine
11mph
W
3.06ft
16:00
Should be fine
10mph
W
2.79ft
17:00
Should be fine
13mph
W
3.54ft
18:00
Should be fine
8mph
W
2.16ft
Sun 24th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
11mph
W
3.06ft
06:00
Should be fine
8mph
W
2.16ft
12:00
Should be fine
9mph
W
2.49ft
18:00
Should be fine
10mph
W
2.79ft
Mon 25th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
20mph
NW
4.77ft
06:00
Should be fine
4mph
NW
Calm
12:00
Should be fine
5mph
NW
0.83ft
18:00
Should be fine
6mph
N
1.34ft
Tue 26th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
4mph
N
Calm
06:00
Should be fine
3mph
E
Calm
12:00
Should be fine
13mph
SE
3.54ft
18:00
Should be fine
19mph
SE
4.62ft
Wed 27th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
10mph
S
2.79ft
06:00
Should be fine
12mph
W
3.31ft
12:00
Should be fine
7mph
SW
1.77ft
18:00
Should be fine
15mph
SE
3.94ft
Thu 28th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Possibly affecting Ardrossan
16mph
S
4.13ft
06:00
Possibly affecting Ardrossan
16mph
S
4.13ft
12:00
Possibly affecting Ardrossan
22mph
S
5.04ft
18:00
Should be fine
15mph
S
3.94ft
Fri 29th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Should be fine
11mph
S
3.06ft
06:00
Possibly affecting Ardrossan
17mph
SW
4.3ft
12:00
Probably affecting Ardrossan
35mph
W
6.36ft
18:00
Possibly affecting Ardrossan
24mph
W
5.28ft
Sat 30th
Port Affected?
Avg Wind
Dir.
Waves
Wx
Temp
Fog?
00:00
Possibly affecting Ardrossan
20mph
W
4.77ft
06:00
Possibly affecting Ardrossan
19mph
W
4.62ft

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