General conditions
The archipelago, which rarely experiences really strong winds, is under the influence of a highly distinctive system consisting of two monsoons separated by a month of variable weather: the inter season. From May to October southeasterly winds blow almost constantly with clear skies. Those winds drop in November, giving way to northeasterly winds bringing heavy rain clouds. The heaviest rainfall is in January and can reach 370mm/4.5 in. The pattern of southeasterly winds returns in April. In between these two periods there are two shorts periods of flat calms or light winds. April and May are the sunniest months; however, the cloudiest months still manage a daily average of five and a half hours of sun. These slight climate changes barely affect the temperature, which remains at a steady 82°F to 86°F (28°C to 30°C) and the level of humidity which is close to 80% year-round. In the Seychelles, weather is constantly changing. Neither rain nor sun ever become set for long periods.
The entire Seychelles area is subject to currents that develop with the monsoon.
The NW monsoon gives rise to a current to the East from December to April. Its average speed is 1.5 knots, though speeds of 4 knots have been recorded locally. In April the current reverses. From June to September, currents flow westwards at a regular rate of 1.2 knots but passages through flats can increase the speed to approximately 4 knots. The return to currents flowing east takes place in December.

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

82

75

28

24

15

386

82

28

5

February

84

75

29

24

11

267

84

29

10

March

84

77

29

25

9

234

84

29

4

April

86

77

30

25

7

183

86

30

3

May

84

77

29

25

6

170

84

29

10

June

82

77

28

25

4

102

81

27

11

July

81

75

27

24

3

84

79

26

12

August

81

75

27

24

2

69

79

26

14

September

82

75

28

24

5

130

81

27

11

October

82

75

28

24

6

155

82

28

10

November

84

75

29

24

9

231

82

28

8

December

82

75

28

24

13

340

82

28

5

Tides
Tides are semi-diurnal and asymmetrical with a gap of about six hours between high tide and low tide. The tidal range is as low as 1.80 m at spring tides and 1.40 m at neap tides.Tides give rise to currents which can be quite strong in the straits between the Islands or in the channel leading to lagoons, which may empty completely at low tide.There can be quite considerable differences in height between the two daily high tides. On your yacht you will find a tide table for your reference.

Weather forecast
When you arrive at the base, we will provide you with a weather forecast for the next 24 hours. SBC, Seychelles Boarding Corporation, the public radio of Seychelles on medium wave 1368 KHz, broadcasts a weather report in Creole between 7.30 a.m. and 8.15 a.m. The same weather bulletin is broadcast in English between 8.30 a.m. and 8.45 a.m. Seychelles Radio can provide a forecast on request on VHF channel 16. Clearance on channel 26 or 27.
The weather station on Mahé (37 33 37) issues a detailed bulletin covering the remote islands.

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