Palmerston has a tropical climate with wet (December to April) and dry (May to November) seasons. Temperatures range from 15-16C in the cooler (dry) season to the low 30s in the hot (wet) season. Humidity can be up in the 90% but being surrounded by sea, there is usually a breeze.
Over the years Palmerston has seen its share of cyclones – 1883, 1914, 1923, 1931, 1935, 1942, 1967, 1993 and 2005. Some of these have been devastating, while others not so. The recent tsunami that struck with catastrophic effects on Samoa and Tonga had little or no effect on Palmerston.