CLIMATE & HEALTHE BULLETIN FOR SEPTEMBER 2026
Summary:
In September 2026, rainfall is expected to increase across the country, with total monthly rainfall expected to range from 352.2mm to 706.5mm. Grand Cape Mount, Bomi, Montserrado, Margibi, Grand Bassa and Rivercess counties are expected to experience the highest rainfall amount. Nevertheless, Maryland, Grand Kru, River Gee, Grand Gedeh and parts of Nimba County are expected to record the lowest rainfall totals during the same period.
Summary:
In September 2026, high average relative humidity is expected to increase in parts of Grand Cape Mount, Bomi, Bong, Nimba, Grand Gedeh and Rivergee counties are expected to experience high relative humidity. Nevertheless, parts of Montserrado, Margibi, Sinoe, Grand Kru, and Maryland are predicted to experience low relative humidity during this period. Average relative humidity during the month is forecasted to range between 88.1% and 90.5%.
Summary:
Maximum temperature in September 2026 is anticipated to range between 27.0°C to 29.2°C across the Country. Gbapolu, Grand Cape Mount, Bomi and Grand Gedeh counties are anticipated to experience high maximum temperature. Margibi, Grand Bassa, Sinoe, Grand Kru counties are anticipated to experience low maximum temperature. However, moderate maximum temperature is expected in the other parts of the country.
Summary:
Minimum Temperature: In September 2026 minimum temperature across the country is anticipated to range between 20.8°C and 25.7°C. The highest minimum temperature is anticipated to occur along the coastal region including counties such as Maryland, Grand Kru, Sinoe, Rivercess, Grand Bassa, Margibi, Montserrado, Bomi and Grand Cape Mount counties while the lowest minimum temperature is expected in Lofa County. The other parts of the country are anticipated to experience moderate minimum temperature.
Summary:
The anticipated weather conditions during the month of September 2026, characterized by increased rainfall, high relative humidity, and favorable temperatures, are expected to create conducive environments for mosquito breeding and survival. Consequently, there is a moderate and high likelihood of increased malaria transmission across the country during the month.
Malaria vigilance is expected to be high in most parts of the Country while Lofa, and parts of Gbapolu, Bong and Nimba counties are expected to experience moderate impact. Health authorities, communities, and households are encouraged to strengthen preventive and control measures, including the proper use of insecticide-treated mosquito nets, environmental sanitation, and the timely diagnosis and treatment of suspected malaria cases.
Continuous monitoring of weather and environmental conditions, coupled with enhanced public health awareness campaigns, will be essential in reducing the potential impacts of malaria during this period.
Highlights of the climate and health Bulletin for SEPTEMBER 2026
Rainfall: Overall cumulative rainfall will increase during the month of september, with totals ranging from 324.5 mm to 706.5mm.
Highest rainfall: South and southwestern regions (Grand Cape Mount, Bomi, Montserrado, Margibi, Grand Bassa and Rivercess counties) are anticipated to experience the highest rainfall.
Lowest Rainfall: Maryland, Grand Kru, River Gee, Grand Gedeh and parts of Nimba county are anticipated to experience the lowest rainfall during the month under review.
Relative Humidity: Forecasted between 87.0% and 90.9% relative humidity is expected. High humidity will be concentrated in parts of Grand Cape Mount, Bomi, Bong, Nimba, Grand Gedeh and Rivergee counties, while parts of Montserrado, Margibi, Sinoe, Grand Kru, and Maryland will experience lower relative humidity.
Temperatures:
Maximum (27.0°C – 29.2°C): the highest is anticipated Gbapolu, Grand Cape Mount, Bomi and Grand Gedeh counties while, the lowest is expected Margibi, Grand Bassa, Sinoe, Grand Kru counties.
Minimum (20.8°C-25.7°C): the highest is anticipated along the coastal area while the lowest is anticipated in the northern side of the country.
Mean (24.3°C-26.3°C): the lowest is anticipated in the northern parts of the country including: Lofa, Gbarpolu, Bong, and Nimba, counties while the highest is anticipated along the coastal belt.
Malaria Risk: Malaria cases are expected to increase along the coastal belt. The combination of rain, high humidity, and warm temperatures creates ideal mosquito breeding conditions. The highest incidence is expected along the coastal belt (Margibi, Grand Bassa, Rivercess, Sinoe, Grand Kru, and Maryland counties).
Malaria Vigilance: The anticipated climatic conditions during September 2026, characterized by increased rainfall, high relative humidity, and favorable temperatures, are expected to create conducive environments for mosquito breeding and survival.
Medication Stability: Expected temperature and humidity levels may compromise the shelf life, stability, and efficacy of sensitive medical supplies across Liberia.
Medical advisory for SEPTEMBER 2026
Based on the foretasted climatic conditions for September 2026, which favor increased mosquito breeding and the spread of vector-borne diseases, medical personnel, individuals, and stakeholders in the health sector are advised to take the following precautionary measures.
Use Prophylaxis & Prevention: Travel with antimalarial medication when visiting high-risk areas, ensure vulnerable groups adhere to prescribed prophylaxis, and sleep under insecticide-treated nets (ITNs).
Eliminate Vector Breeding: Clear stagnant water and improve community sanitation to destroy mosquito breeding grounds.
Seek Early Care: Promptly visit recognized health facilities if experiencing symptoms like fever, chills, headache, or fatigue.
Protect Medical Supplies: Store all pharmaceuticals in cool, dry places to prevent heat and humidity degradation.
Strengthen Surveillance: Boost community awareness and report suspected cases early to support public health interventions.