Agrometeorological Dekadal Bulletin-2nd DEKAD OF SEPTEMBER 2026

HIGHLIGHTS OF THE AGROMETEOROLOGICAL BULLETIN

SECOND DEKAD OF SEPTEMBER 2026

Rainfall

During the second dekad of September 2026, relatively high rainfall was recorded across the western parts of Liberia, particularly in Grand Cape Mount, Bomi, Montserrado, Margibi, Gbarpolu, and Lofa Counties. Meanwhile, Maryland, Grand Kru, River Gee, and parts of Grand Gedeh and Sinoe Counties received comparatively lower rainfall. Moderate rainfall was observed across the remaining parts of the country. Nationwide, accumulated rainfall ranged from 0.0 mm to 187.2 mm.

Soil Moisture Index (SMI)

During the second dekad of September 2026, soil moisture conditions were above normal across the western and central parts of the country. However, below-normal soil moisture conditions were observed in Maryland, Grand Kru, River Gee, and parts of Grand Gedeh County.

Potential Evapotranspiration (PET)

During the second dekad of September 2026, relatively high evapotranspiration rates were observed mainly across the northern and northeastern parts of the country, particularly in parts of Grand Gedeh, Nimba, Bong, and Lofa Counties. The southern coastal region recorded the lowest evapotranspiration rates, while moderate rates were observed across the central region.

Maximum Temperature

Maximum temperatures varied across the country during the second dekad of September 2026. Nimba and parts of Bong, Grand Bassa, River Cess, and Grand Gedeh Counties recorded relatively high maximum temperatures, while Sinoe, River Gee, Grand Kru, Maryland, and parts of River Cess experienced relatively lower temperatures. Moderate maximum temperatures were observed elsewhere. National maximum temperatures ranged from 26.5°C to 28.4°C.

Minimum Temperature

Minimum temperatures also varied across the country. The southern and central regions recorded relatively higher minimum temperatures, while the northern region experienced the lowest. Minimum temperatures ranged from 21.8°C to 25.9°C during the period.

WEATHER OUTLOOK FOR SEPTEMBER 2026

Rainfall

In September 2026, rainfall is expected to increase across the country, with total monthly rainfall forecast to range from 352.2 mm to 706.5 mm. The highest rainfall amounts are expected in Grand Cape Mount, Bomi, Montserrado, Margibi, Grand Bassa, and River Cess Counties. Lower rainfall totals are expected in Maryland, Grand Kru, River Gee, Grand Gedeh, and parts of Nimba County.

Maximum Temperature

Maximum temperatures in September 2026 are expected to range from 27.0°C to 29.2°C. Relatively high maximum temperatures are anticipated in Gbarpolu, Grand Cape Mount, Bomi, and Grand Gedeh Counties, while lower maximum temperatures are expected in Margibi, Grand Bassa, Sinoe, and Grand Kru Counties. Moderate temperatures are expected across the remaining areas.

Minimum (Nighttime) Temperature

Minimum temperatures are expected to range from 20.8°C to 25.7°C across the country. The highest minimum temperatures are anticipated along the coastal region, particularly in Maryland, Grand Kru, Sinoe, River Cess, Grand Bassa, Margibi, Montserrado, Bomi, and Grand Cape Mount Counties. The lowest minimum temperatures are expected in Lofa County, while moderate minimum temperatures are anticipated elsewhere.

FARMERS' ADVISORIES

• As the cropping season gradually draws to a close, increased rainfall across the western and central parts of the country may lead to saturated soils. Meanwhile, parts of the southeastern region are experiencing reduced rainfall and declining soil moisture conditions. The expected increase in rainfall during September may affect harvesting activities and agricultural production.
• Farmers are advised to take precautions as heavy rainfall is expected to continue. Excessive rainfall may cause harvested crops and other farm products to spoil, damage standing crops, delay harvesting, disrupt farm activities, and make transportation difficult. Farmers should regularly monitor weather updates, store farm inputs and harvested products in safe and dry places, and avoid crossing flooded roads, rivers, and other waterways during periods of heavy rainfall.
• Farmers are encouraged to regularly inspect their crops, as prolonged wet conditions may increase the risk of pests and diseases. Where pests or diseases are detected, farmers should take early action using recommended agricultural practices and approved pesticides, where necessary.

Note: Farmers should consult agricultural extension officers before using pesticides or implementing pest and disease control measures.

• Livestock producers are advised to keep animals in well-protected and adequately ventilated shelters. Prolonged wet conditions may increase the risk of infectious and respiratory diseases, while dry periods may contribute to heat stress, water shortages, and reduced feed availability. Producers should closely monitor livestock for signs of illness, dehydration, heat stress, or abnormal behavior and seek prompt veterinary assistance when necessary.
• Vegetable producers are advised to continue farming activities in well-drained upland areas and properly design and lay out their fields. Appropriate drainage and soil conservation measures should be implemented to minimize soil erosion, waterlogging, and nutrient loss during periods of heavy rainfall.

Summary:

Rainfall: During the second dekad of September 2026, the western parts of the country experienced relatively high rainfall, with Grand Cape Mount, Bomi, Montserrado, Margibi, Gbapolu and Lofa Counties recording the highest amounts. Nevertheless, Maryland, Grand Kru, River Gee and parts of Grand Gedeh and Sinoe Counties received less rainfall during the period, while moderate rainfall was observed across other parts of the country. Nationwide, accumulated rainfall ranged from 0.0 mm to 187.2 mm during the second dekad of September 2026.

Summary:

Soil Moisture Index (SMI): During the second dekad of September 2026, soil moisture conditions were above normal in the western and central parts of the country. However, Maryland, Grand Kru, Rivergee, and parts of Grand Gedeh Counties experienced below normal soil moisture condition.

Summary:

PET: During the second Dekad of September 2026, the north of the country experienced intense sunshine with high evapotranspiration rates however, parts of Grand Gedeh, Nimba, Bong and Lofa counties observed the highest. Nevertheless, the southern (coastal) region experienced lowest evapotranspiration rate while the central region experienced moderate evapotranspiration rate

Summary:

Maximum Temperature: The second dekad of September 2026 was marked by variation in maximum temperature across the country. Nimba and parts of Bong, Grand Bassa, Rivercess and Grand Gedeh Counties experienced highest maximum temperature while Sinoe, Rivergee, Grand Kru and Maryland and parts of Rivercess County recorded relatively low maximum temperature. The other parts of the country experienced moderate maximum temperature. During this period, maximum temperature was observed between 26.5° C and 28.4°C .

Summary:

Minimum Temperature: The second dekad of September 2026 was characterized by variation in minimum temperature. The southern and central parts of the country experienced relatively high minimum temperature, while the northern region experienced the lowest. Minimum temperature during this period ranged from 21.8°C to 25.9°C