In the Marshall Islands, the climate is tropical, hot all year round, with little variation in temperature. The trade winds blow constantly, tempering the heat.
In the capital, Majuro, the temperature is definitely stable throughout the year: lows are around 25 °C (77 °F), while highs are around 30 °C (86 °F); the temperature rarely drops below 22 °C (72 °F) at night or exceeds 32/33 °C (90/91 °F) during the day.
Here are the average temperatures of the capital Majuro.
Majuro - Average temperatures
Min (°C)252525252525252525252525
Max (°C)303030303030303030303030
Min (°F)777777777777777777777777
Max (°F)868686868686868686868686

The islands are divided into two groups, Ralik and Ratak, both stretched from north to south, but the main difference in the climate of the islands lies in the rainfall and depends on latitude: the central and southern islands are rainy all year round, so that their climate can be called equatorial, while in the islands lying north of the tenth parallel (Enewetak, Bikini, Rongelap, Taka, Utirik, Taongi), there is a relatively dry season from December to April. In the northern group, annual precipitation is around 1,500 millimetres (60 inches), with a maximum between August and October, when it exceeds 200/250 mm (8/10 in) per month, and a minimum from January to March, when it drops below 40 mm (1.6 in) per month. During the years of La Niña, when the rains decrease throughout the islands, these northern atolls, which are already less rainy in normal years, can experience drought.
Here is the average precipitation in the northern atoll of Enewetak.
Enewetak - Average precipitation

Moving south, rainfall becomes progressively more abundant, so that the it can reach 2,500 mm (100 in) per year already in the atoll of Kwajalein. At this latitude, between January and March the rains are still acceptable, since rainfall drops below 110 mm (4.3 in) per month.
In the southernmost atolls, the rains are really abundant: in the capital Majuro, 3,300 mm (130 in) of rain per year fall, with a minimum of 180 mm (7 in) in February, and a maximum of 360 mm (14 in) in October. Here is the average precipitation in Majuro.
Majuro - Average precipitation

The amount of sunshine in the Marshall Islands is always at least acceptable, because even in the wettest months the rains do not last long, given that they occur in the form of short and intense downpour or thunderstorm.
Here are the sunshine hours per day in Majuro.
Majuro - Sunshine


The sea in the Marshall Islands is pleasantly warm all year round, as we can see in the following table.
Majuro - Sea temperature
Temp (°C)292828292929292929292929
Temp (°F)848282848484848484848484

Tropical cyclones

The Marshall Islands can be affected by tropical cyclones; in particular, in this area, many of the typhoons that then head towards south-east Asia are formed: this means that generally they do not affect these islands at the peak of their strength, because they are still in the early stages. Typically, typhoons occur from April to December, although 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.

When to go

The best time to visit the Marshall Islands runs from January to March in the central and southern atolls, because it is the least rainy period, even though there is still a fair amount of showers and thunderstorms, while in the northern islands it runs from December to April, being a period of quite rare and generally not abundant rains.

What to pack

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.
For the reef, equipment for snorkeling, water shoes or rubber soled shoes.