The climate in the archipelago of Palau (or Belau) is equatorial, that is, hot, humid and rainy throughout the year. In fact, there is no real dry season, but only a relative decrease in the frequency of showers and thunderstorms between February and April.
In the capital, Ngerulmud (or Melekeok), the daytime temperature is around 30/31 °C (86/88 °F) all year round, while at night it's around 23/24 °C (73/75 °F).
Here are the average temperatures.
Ngerulmud - Average temperatures
Min (°C)232323242424242424242424
Max (°C)303030313131303030313131
Min (°F)737373757575757575757575
Max (°F)868686888888868686888888

The rains are plentiful, and amount to around 3,600 millimeters (140 inches) per year; the rainiest months are those of summer (June, July and August), although we cannot speak properly of summer because the temperature is stable throughout the year.
Here is the average precipitation in the Airai airport.
Airai - Average precipitation

The amount of sunshine is acceptable from February to May, and lessens a bit from June to December, when showers occur almost daily. However, the sun almost always shines for a few hours a day, except when a typhoon reaches the islands (see below).
Ngerulmud - Sunshine


The sea in Palau is warm enough to swim in all year round, and has a very stable temperature, as we can see in the following table.
Ngerulmud - Sea temperature
Temp (°C)282828292929292929292929
Temp (°F)828282848484848484848484

Tropical cyclones

Palau can be hit by typhoons, ie the tropical cyclones of south-east Asia, which reach the country, and then move towards the Philippines. Typhoons, along with the less intense tropical storms, bring rains and strong winds, and normally occur between April and December, though they are more frequent between August and November. However, since the sea is always warm, sometimes they can also occur from January to March, although usually during this period tropical depressions not intense are formed.
On the contrary, the south-western islands (states of Sonsorol and Hatohobei), being near the equator, are protected from typhoons, or at most they may be affected marginally.

Best Time

The best time to visit Palau runs from February to April because it's the least rainy and the sunniest of the year. Even in this period, however, showers and thunderstorms must be put into account, but they they do not last long, so they soon give way to the sun.

What to pack

All year round, bring tropics-friendly, loose-fitting clothing, a sun hat, a scarf for the breeze, a light sweatshirt for the evening, a light raincoat or umbrella.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.