Country

Samoa

Explore historical and projected climate data, climate data by sector, impacts, key vulnerabilities and what adaptation measures are being taken. Explore the overview for a general context of how climate change is affecting Samoa.

Climate Data Historical

Samoa’s climate is typical of that associated with small tropical islands. Samoa has two seasons, rainy and warm (November-April), and dry and cool (May-October), which are marked by significant differences in rainfall. The rainfall and humidity are typically high with the average annual rainfall reaching around 3,000 mm with approximately 66% of this happening in the wet season. The temperature is typically tropical (ranging from 24-32°C daily) and generally constant during the entire year with little seasonal variation due to Samoa’s near-equatorial location. Observations from the Meteorological Office at Mulinu’u have revealed that the highest mean temperature of 27.1°C occurs between December and March, while the lowest mean temperature of 26.0°C occurs between July and September. Weather patterns are vulnerable to anomalously long dry spells that coincide with the El Niño Southern Oscillation (ENSO). Samoa experiences southeast trade winds all year round. However, severe tropical cyclones occur during the southern hemisphere summer months of December to February. The rainfall distribution patterns are influenced by the island topography, the meridional migration of the South Pacific Convergent Zone (SPCZ), and the persistent southeast trade winds. Key historical climate trends are summarized below:

Temperature

  • Mean annual temperature has increased by 0.59°C, with the minimum and maximum temperature increasing by 0.67°C and 0.18°C, respectively.
  • The numbers of hot days and hot nights15 have increased significantly across the Pacific.
  • Meteorological data of Samoa collected over 101 years indicate mean, maximum, and minimum temperature increases.

Precipitation

  • Meteorological data of Samoa collected over 101 years indicate a decreasing trend in precipitation by 49.28 mm.

This section provides the options to visualize historical climate data for different timeframes via map and annual cycle chart.

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