Temperatures vary little from day to day and month to month, with average high temperatures of 88 degrees Fahrenheit and average low temperatures of 80 degrees Fahrenheit. Highs occur in the early afternoon and lows occur with showers at any time of the day, or in the early morning if there are no showers.

Because of the low latitude, there are only slight seasonal variations in the length of daylight periods and the altitude of the sun at Kwajalein. As a result, the variation of the amount of solar energy received is small.

Severe storms and damaging winds are uncommon in the vicinity of Kwajalein. However, weaker depressions may form near the island during any season. Some of these intensity and eventually develop into typhoons after moving westward away from the island. These depressions can cause heavy rainfall in the Kwajalein Atoll.

The relative humidity is uniformly high throughout the year, and is slightly higher in the wet season than in the dry season. The combination of high humidity and proximity of the saltwater ocean presents a corrosion problem.