Guinea-Bissau
Narrative updated. “El Niño's global bark looks louder than its bite for Bissau's rains this season”
Global El Niño coverage has been alarmist, with one outlet warning the event is reaching extreme proportions and could cause chaos worldwide, yet the measured signal for Guinea-Bissau remains weak. Rainfall for July–October 2026 came in about 8% below the 1991–2020 average, while mean temperatures ran roughly 1.3°C above normal, matching the record marine heat and coastal sea level surges documented for the 2023–24 El Niño in African marine domains. The Global Weather Hazards summaries for late September and early October 2026 show no acute drought or flood emergency for the country, leaving the rainy season and planting calendar broadly on schedule ahead of the October–November harvest.
1069.3 mm vs 1162.2 mm normal
Rainfall for the July–October 2026 window tracked about 8% below the 1991–2020 average, a modest shortfall that is consistent with the weak canonical El Niño signal for Guinea-Bissau rather than the extreme drying some global headlines imply.
News source27.47°C mean vs 26.15°C normal
Mean temperatures over the same window ran about 1.3°C above normal, an anomaly that aligns with the record marine heat and coastal sea level surge documented for the 2023–24 El Niño in African marine domains.
News sourceThe rainy season (June–September) and planting calendar (June–July) appear to have proceeded broadly on schedule, with the October–November harvest expected to be only mildly affected by the modest rainfall deficit.
NASA POWER (MERRA-2) reanalysis, 9 Jul 2026 – 6 Oct 2026, sampled at the country centroid (12.0°, -15.0°). Normals are 1991–2020. How this is computed
When it matters
Agricultural calendar for Guinea-Bissau and where the El Niño impact window falls
Last 12 months vs normal
Observed monthly rainfall against the 1991–2020 climatology
Sector by sector
The roughly 8% rainfall deficit is expected to trim yields modestly, but with the June–September rainy season and June–July planting broadly on schedule, the October–November harvest should escape severe losses.
Slightly below-average rains may reduce dry-season surface water and recharge in some basins, though no acute shortage is flagged in the late-September and early-October 2026 hazard summaries.
Warmer conditions and erratic rainfall are expected to sustain mosquito breeding and raise the risk of malaria and waterborne disease, with heat stress adding to nutrition pressures during the lean season.
Above-normal temperatures are likely to raise cooling demand and strain the grid, while reduced river flows could marginally curb hydropower output in the dry season.
Warmer-than-normal coastal waters (+1.3°C) and the sea level surges linked to the 2023–24 El Niño could shift fish stocks and disrupt artisanal fishing grounds along the Bijagós archipelago.
What happened last time
Past El Niño episodes and how Guinea-Bissau responded. See the full ENSO timeline →
2023-24
The 2023–24 El Niño amplified record sea level surges in African marine domains, raising coastal flood exposure for low-lying West African states such as Guinea-Bissau.
Source2015-16
One of the strongest El Niño events on record coincided with poor rains and crop shortfalls in the Sahel and coastal West Africa, contributing to food insecurity in Guinea-Bissau.
unsourced background1997-98
A very strong El Niño brought erratic rainfall and coastal flooding to West Africa, disrupting rice and groundnut harvests across the sub-region including Guinea-Bissau.
unsourced backgroundLatest coverage
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Neighbouring countries