General conditions
The Mediterranean enjoys an average of 315 cloudless days each year. During the cruising season of April to October, the skies are blue and the weather warm, with water temperatures averaging 80ºF (27ºC). Midsummer offers long evenings, glorious sunsets, and calm seas. The water temperature is about 67ºF (19°C) in the low season and about 82ºF (28°C) in the high season.
There is generally a light southerly wind during spring and autumn. July to August brings stronger winds. The eastern Mediterranean has a very small tidal range at one to two feet. 

The two dominant winds in Greece can produce conditions that require sailing experience.

  1. Lavrion will experience the Meltemi throughout the summer months and this can blow 15 to 40 knots for periods of up to five days. Winds blow variously north-east, north and north-west, beginning in May and reaching a peak in July, then slowing down in September
  2. The Sirocco: Southeasterly, more frequent in winter, the Sirocco corresponds to the passage of a depression. It can occasionally blow in April or at the end of October.

The waters of the Saronic Gulf are well-protected and flat, while the Aegean and the seas around the Cyclades generally have more wind. 

Historical weather (averages by month):


Month

°F Max

°F Min

°C Max

°C Min

Avg Precip (in)

Avg Precip (mm)

Avg Water Temp (°F)

Avg Water Temp (°C)

Avg Wind Speed (knots)

January

55

43

13

6

2.2

55

61

16

11

February

55

43

13

6

1.9

49

59

15

14

March

61

45

16

7

1.8

46

59

15

11

April

68

50

20

10

1.1

29

61

16

10

May

77

57

25

14

0.8

21

64

18

9

June

86

66

30

19

0.4

11

70

21

10

July

90

70

32

21

0.2

5

75

24

10

August

90

70

32

21

0.3

6

75

24

10

September

84

64

29

18

0.5

12

75

24

10

October

73

57

23

14

2.1

53

70

21

13

November

64

50

18

10

2.4

61

66

19

10

December

57

46

14

8

3.0

75

63

17

11

Tides
In the eastern Mediterranean, the tide range is very small: 30 to 60 cm (one to two feet) including the variation of level due to atmospheric pressure and dominant winds.

Weather forecast
When you arrive at the base, we will provide you with a weather forecast for the next 24 hours.  During your cruise you can see the weather forecast on all television channels; tavernas and restaurants show weather programs just after the news at 8.50 p.m.
Wind direction and speed is clearly indicated on a map.
Harbour Offices receive a weather forecast regularly. A weather forecast is also available on the web at http://www.poseidon.hmcr.gr On your radio receiver, on the Greek national station, forecasts are broadcast in Greek and English.

Time – station – frequency – radio wave:
6.30 a.m. Athens 729 kHz 412 m
1.10 p.m. Corfu 1008 kHz 298 m
1.30 p.m. Rhodes 1494 kHz 200 m
12.00 p.m. Patras 1485 kHz 202 m

The Italian station, Radio One, announces forecasts for the Ionian Sea at approximately 7.4a.m. and 11.4p.m. on 567, 657, 666, 675, 1032, and 1332 kHz frequencies.
East of the Greek archipelago the forecast is in German at approximately 9.45 a.m. and 2.00 p.m. on short wave on 6150 MHz/49 m frequency. On your VHF: You can call HELLAS RADIO on channel 16 in English. You will be given the weather forecast for your zone, after you give them your VHF code signal and the name of your boat.

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