Lamu County experiences a tropical monsoon climate, characterized by warm temperatures year-round, distinct wet and dry seasons driven by monsoon winds, high humidity, and occasional tropical storms. The climate shapes agriculture, fishing, livelihoods, and daily life throughout the county.
Temperature is warm year-round, with little seasonal variation. Mean annual temperature is approximately 26-28 degrees Celsius. The hottest months (October-March) see temperatures sometimes exceeding 35 degrees Celsius. The cooler months (June-August) are still warm but more pleasant, with sea breezes providing relief. Humidity is high year-round due to the proximity to the Indian Ocean, typically between 70-85%, making the heat feel more intense.
Rainfall is highly seasonal and driven by monsoon winds. The Indian Ocean monsoons create two main rainfall seasons: the long rains (March-May) and the short rains (October-November). The long rains typically bring more substantial rainfall, while short rains are lighter. Between these seasons are dry periods (June-September and December-February) when little rain falls. Annual rainfall varies year to year (ranging from 500-1000 mm in different years), but long-term average is approximately 800 mm annually.
This seasonal rainfall pattern has shaped all aspects of life in Lamu historically. Fishing season, farming timing, and planning of activities all follow the monsoon pattern. The northeast monsoon (June-September) provides strong, consistent winds favorable for sailing dhows. The southwest monsoon (November-February) creates opposite conditions, sometimes dangerous for sailing and fishing boats.
Water scarcity is the fundamental climate-related challenge. The dry seasons see very limited rainfall, and groundwater reserves are depleted. Freshwater is stored in shallow aquifers recharged by rainfall, but in dry years these reserves are insufficient. Water scarcity constrains agriculture, limits livestock, and creates hardship for human consumption. Wells sometimes dry up. The demand for water exceeds supply in dry seasons.
Droughts are periodic climate events that create severe hardship. The 2011 drought affected the region severely. The 2016-2017 drought was particularly devastating, with widespread livestock deaths, crop failures, and hardship. Droughts are becoming more frequent and intense, possibly linked to climate change.
Rainfall variability is high, meaning that annual rainfall varies significantly from year to year. This variability makes planning difficult: a good rainfall year may be followed by a poor year. Farmers cannot reliably predict whether their crops will receive adequate water. This variability contributes to economic insecurity and food insecurity.
Coastal winds are a regular feature. The monsoons provide strong winds, sometimes creating hazardous conditions for boats and buildings. Strong winds can damage buildings and create challenges for transportation.
Tropical storms and cyclones are rare but possible. Extreme weather events, though not frequent, can occur and create significant disruption.
The ocean climate is influenced by currents and temperature. The Indian Ocean waters off Lamu support diverse marine life, though fish stocks have declined due to overfishing. Sea water temperatures are warm year-round, supporting diverse fish species and coral reefs. However, ocean acidification and warming are affecting marine ecosystems.
Climate change is increasingly affecting Lamu. Projections suggest rising temperatures, more erratic rainfall patterns, and increased drought frequency. Sea-level rise is a particular concern for the low-lying archipelago and coastal areas. Higher seas could inundate settlements, salt-intrude agricultural areas, and threaten freshwater aquifers.
Coastal erosion is occurring in some areas, exacerbated by sea-level rise and human activities (removal of mangroves, construction). This threatens settlements and infrastructure in coastal zones.
Coral bleaching events have occurred during periods of elevated ocean temperatures, damaging coral reefs and reducing reef productivity. This affects fish populations and marine livelihoods.
Climate adaptation strategies being pursued in Lamu include water harvesting (collecting and storing rainwater), agricultural diversification (shifting crops to drought-resistant varieties), and improved water management infrastructure. However, adaptation efforts remain limited by resources and capacity.
Climate policy at the national and county levels emphasizes mitigation (reducing greenhouse gas emissions) and adaptation (adjusting to climate impacts). However, implementation in Lamu is constrained.
See Also
- Lamu Marine Environment
- Lamu Climate Change
- Lamu Agriculture
- Lamu Fishing
- Lamu Infrastructure
- Lamu Land
- Lamu Health
Sources
- Mwangi, Elias and Swallow, Brent M. "Invasion of Prosopis Juliflora and Conflicts over Land Resources in Pastoral Areas of Kenya." (Land Degradation and Development, Vol. 19, No. 6, 2008).
- Thornton, Philip K. et al. "Climate Change and Livestock Systems." (CGIAR Research Program on Climate Change, Agriculture and Food Security, 2015).
- Kenya Meteorological Department. "Climate Prediction: Seasonal Rainfall Forecasts for Coastal Kenya." (Various, annual reports).
- Jauhiainen, Jussi S. "Climate Change and Livelihoods in Coastal Kenya." (In Localizing Development: Changing Development Discourses in East Africa, 2014).