Tokelau, an archipelago consisting of three coral atolls, is a territory of New Zealand in the South Pacific Ocean, and has a hot, humid and rainy climate throughout the year.
The temperature is very stable: the daily average is around 28 °C (82 °F) in the northernmost atoll of Atafu throughout the year, while it goes down to 27 °C (81 °F) in the southernmost atolls, therefore further from the equator, of Nukunonu and Fakaofo.
Here are the average temperatures of Nukunonu.
Average temperatures - Nukunonu

Nukunonu	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Nukunonu	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	24	24	24	24	24	24	24	24	24	24	24	24
Max (°C)	30	30	30	30	30	30	30	30	30	30	30	30
Min (°F)	75	75	75	75	75	75	75	75	75	75	75	75
Max (°F)	86	86	86	86	86	86	86	86	86	86	86	86

The rainfall is abundant, amounting to around 2,800 millimetres (110 inches) per year, with a rainier period between November and March, when the rainfall amount is not less than 250 mm (10 in) per month, and a relatively less rainy period between April and September, when, however, it doesn't go below 150 mm (6 in) per month. Here is the average precipitation in Nukunonu.
Average precipitation - Nukunonu

Nukunonu	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Nukunonu	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	360	290	245	180	165	205	195	170	175	200	245	310	2745
Prec.(in)	14.2	11.4	9.6	7.1	6.5	8.1	7.7	6.7	6.9	7.9	9.6	12.2	108.1
Days

For swimming, the sea is warm all year round, as we can see in the following table.
Sea temperature - Tokelau

Tokelau	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Tokelau	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	30	30	29	29	29	29	29	29	29	29	30	30
Sea (°F)	86	86	84	84	84	84	84	84	84	84	86	86

Tropical cyclones

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Tokelau lies in the path of tropical cyclones. Cyclones are usually formed from November to mid-May, though they are most likely from late December to early April. Sometimes, however, they have occurred outside of this period, as happened with Keli in June 1997. A particularly destructive cyclone in these islands was Percy at the end of February 2005.

When to go

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The best time to visit the Tokelaus runs from mid-May to October, being the driest (though showers and thunderstorms are still relatively frequent) and out of the period of cyclones. Given the albeit rare precedents in which cyclones have occurred outside of this period, for greater security, you can restrict the period to July-mid-October.

What to pack

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All year round, tropics-friendly, loose fitting clothing, sun hat, a scarf for the breeze, a light sweatshirt for the evening, light raincoat or umbrella.