The Solomon Islands have a warm, tropical climate year-round. Temperatures across the country range between 25-32°C and precipitation ranges between 3000-5000 millimeters annually, although the most intense part of the rainy season occurs during the north-westerly monsoonal winds that bring tropical cyclones across the archipelago between December-March. The El Nino Southern Oscillation (ENSO) is an important driver of climate in the Solomon Islands, heavily influencing periods of drought, the risk of floods and the frequency of tropical cyclones. Climate in this part of the Pacific is governed by a number of factors that include the trade winds and the movement of the South Pacific Convergence Zone (SPCZ), a zone of high-pressure rainfall that migrates across the Pacific south of the equator. Year-to-year variability in climate is also strongly influenced by the El Niño conditions in the south-east Pacific, which bring drought conditions to the Solomon Islands.
- Monitoring stations across the Solomon Islands point to increases in average temperature between 1962-2012 at a rate of around 0.14-0.17°C per decade.
- Rates of warming appear to have accelerated since about 1990.
- The Solomon Islands precipitation records suffer from significant data gaps and no historical trends can be linked to climate change at this time.