Tuvalu (formerly Ellice Islands), an archipelago located in the Pacific Ocean to the south of the Equator, has an equatorial climate, ie hot, humid and rainy throughout the year. The rains, occurring in the form of downpours of thunderstorms, can be intense, but usually do not last long, and do not greatly reduce the hours of sunshine.
Temperatures are very stable, around 25 °C (77 °F) at night and 31 °C (88 °F) during the day. The trade winds blow all year round, but especially in the period from April to October, tempering a little the heat.
Here are the average temperatures of the capital, Funafuti.
Funafuti - Average temperatures
Min (°C)252525252525252525252525
Max (°C)313131313131313131313131
Min (°F)777777777777777777777777
Max (°F)888888888888888888888888

Precipitation is definitely abundant, since it exceeds 3,000 millimeters (120 inches) per year.
In Funafuti, 3,200 mm (126 in) of rain fall per year, with a peak between December and March, when rainfall is equal to or greater than 300 mm (12 in) per month, and a minimum (very relative...) between May and October, when it drops below 250 mm (10 in) per month. On the northernmost islands, the rainfall is slightly less abundant. Here is the average precipitation in Funafuti.
Funafuti - Average precipitation

The amount of sunshine at Tuvalu is decent but not exceptional, as clouds that can give rise to rain showers are frequent, but as mentioned, they do not last long. Here are the average sunshine hours per day.
Funafuti - Sunshine


The sea in Tuvalu is warm enough to swim in all year round, as we can see in the following table.
Funafuti - Sea temperature
Temp (°C)292929303029292929293030
Temp (°F)848484868684848484848686

Tropical cyclones

Tuvalu is affected by the tropical cyclones of the South Pacific. Cyclones are usually formed from November to mid-May, though they are most likely from late December to early April. Sometimes, however, they have affected the archipelago outside of this period, as happened with Bebe in late October 1972 and Keli in June 1997. Being not far from the Equator, the islands are generally affected by cyclones at the beginning of their formation, but considering that Tuvalu is one of the flattest countries in the world, it may be affected by flooding and storm surges, even when cyclones are not are very strong or if they pass at a certain distance. The northernmost islands (Nanumea, Niutao, Nanumanga), closer to the Equator, are located at the edge of the area, where cyclones are more rare, while the most affected islands are the southernmost ones (Nukulaelae and Niulakita).

Best Time

The best time to travel to Tuvalu is from mid-May to late October, since it is the (relatively) least rainy period, and out of the cyclone season. However, since there have sometimes been cyclones outside of the canonical period, to be on the safe side, you can choose the period from July to mid-October.

What to pack

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