General conditions
Bear in mind that the seasons in Tonga are opposite from those in the Northern Hemisphere – when it’s winter in the north, it’s summer south of the equator.
The best time to visit is during the driest season, April to November, when day temperatures are around 70°F to 80°F (21°C to 27°C) and the nights are in the 60s °F (16°C to 21°C).
December till March is the rainy season, but it isn’t usually so bad that it would deter a visit and it’s a few degrees warmer then.
Trade winds blow all year round: you might need a light sweater for the evenings.
Tonga’s climate is pleasant and slightly cooler than that of most tropical areas. The average annual temperature in Nuku'alofa is 75°F (23.7°C), and average humidity is around 76%, with water temperatures from 73.5°F (23°C) in winter to 86°F 30°C) in the summer.

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)

Ave Wind Speed (knots)

January

84

75

29

24

5.0

127

81

27

SE-E 10-25 

February

84

75

29

24

8.0

203

81

27

SE-E 10-25 

March

84

75

29

24

9.0

229

81

27

SE-E 10-25 

April

82

73

28

23

5.0

127

81

27

SE-E 10-25 

May

79

70

26

21

6.0

152

79

26

SE-E 10-25 

June

79

70

26

21

4.5

114

77

25

SE-E 10-20 

July

77

68

25

20

4.0

102

75

24

SE-E 10-20 

August

77

68

25

20

5.0

127

73

23

SE-E 10-20 

September

77

68

25

20

4.0

102

73

23

SE-E 10-20 

October

79

70

26

21

3.8

97

75

24

SE-E 10-20 

November

81

72

27

22

4.0

102

77

25

SE-E 10-20 

December

82

73

28

23

5.0

127

79

26

SE-E 10-25 

 

Tides
In Vava'u there are two high and low tides in a 24-hour period. The average tide rise is 3.3 feet. When going ashore, make sure the dinghy is well above the high water mark and use the dinghy anchor on the beach to prevent a rising tide from floating the dinghy off the beach. Tide tables are provided on each yacht.
The tides sometimes cause strong currents in narrow passages, as in the entrance to Hunga (#13). Please take note of the advice given in the guide regarding such locations in the cruising area. Care and normal seamanship should be used in your assessment of situations.
During periods of strong winds from a constant direction, surface currents will build up. An example of this would be during the south-east trades between April and December. These winds will build up a current across the southern part of the area from east to west. When steering a compass course, be aware these currents may set you off your intended course. Take a bearing with the hand-bearing compass to verify your position.

Weather Forecasts
Radio:
Radio Polynésie (RFO) on 94 FM, at 5.55 a.m., 6.50 a.m., 7.50 a.m., 10.30 a.m. and 5.50 p.m. 
VHF 10: The base takes a report from the Internet each day from Météo-France and a chart indicating all centres of pressure.
VHF 26: “Mahina Radio” 11.00 a.m., 12.00 a.m., 8.40 p.m., 9.00 p.m. (English on request only). Mahina radio is on Channel 27 in the Windward Islands.
By phone directly to Météo France, tel: 36 70 08
The Moorings base, tel: 600 485

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