Rainy Season in West & Central Africa: Navigating Risks for Organizations and Employees

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West and Central Africa’s rainy season (May–October) brings flooding, disease outbreaks, and infrastructure failure that directly threaten organizational operations. Here is what the data shows, what the risks are, and what risk managers need to act on now.

Key Takeaways

West and Central Africa’s rainy season is not only a weather event. It is an operational risk that can disrupt staff movement, damage facilities, interrupt supply chains, and limit access to healthcare.
Risk levels vary significantly by country. Nigeria, Chad, Mali, DRC, and Niger show elevated exposure and/or constrained coping capacity, meaning organizations may need to plan for limited support from local emergency systems.
Rainy season impacts were lower in some countries in 2025 than in 2024, but that does not mean the overall threat is decreasing. It shows why organizations should plan for country-specific and year-to-year variability rather than relying on the previous season as a guide.
Organizations should act before the season begins by assessing flood exposure, mapping alternative routes, testing evacuation plans, establishing offline communication protocols, and briefing staff on health risks.

Why Rainy Season Risk Requires Operational Planning

The 2025 season claimed 783 lives, affected 2.4 million people across 17 countries, displaced 394,000 people, and damaged or destroyed 148,000 homes. In Nigeria alone, 403,000 people were affected and 136,000 displaced. 115 health facilities were damaged, limiting the very infrastructure communities depend on when floods strike.

Planning gaps leave organizations exposed

The scale of disruption reflects a deeper planning problem. Flood hazards in West and Central Africa remain poorly documented due to persistent data gaps, while contingency plans across the region often underestimate local conditions and the reliability of critical infrastructure. Organizations are therefore managing rainy season risk with incomplete information.

Climate projections suggest this planning gap will widen. Flood frequency and magnitude in West and Central Africa are expected to increase under both near- and long-term scenarios. At the same time, recent seasons show that impacts can vary significantly by country and year. Although several countries recorded lower impacts in 2025 than in 2024, others saw increases within the same season. For organizations, that variability is part of the risk: last year’s experience is not a reliable guide for this year’s planning.

Country risk: flood exposure and response capacity vary significantly

Infrastructure quality and government response capacity differ widely across West and Central Africa. In practice, this means the same flood event can have very different consequences depending on where your people are, how quickly roads get cleared, whether hospitals can absorb additional patients, and how effectively local authorities coordinate a response.

Country-level data from the INFORM Risk Index 2026 on both flood exposure and coping capacity points to where organizations should particularly factor risk into travel and operational decisions.

High flood exposure + constrained coping capacity Mixed profile Lower compound risk

Source: INFORM Risk Index 2026 v0.7.2, European Commission Joint Research Centre. Scores range from 0–10; higher scores indicate greater flood exposure or lower coping capacity.

On river flood exposure, Nigeria (8.3 out of 10), Chad (8.1), and Mali (7.9) score highest. On lack of coping capacity, covering governance, infrastructure, and access to healthcare, Chad (8.6), DRC (8.1), and Niger (7.7) score highest, meaning response capacity in these countries is most constrained.

The countries where both scores are elevated represent the most demanding operating environments. Chad scores 8.1 on flood exposure and 8.6 on lack of coping capacity. Nigeria scores 8.3 and 7.0 respectively. DRC scores 7.0 and 8.1. In these contexts, organizations should expect limited support from local emergency systems and plan accordingly.

Countries like Senegal (flood exposure 6.3, coping capacity gap 5.3) and Ghana (4.7, 5.0) show a different profile. Flood risk is real but institutional capacity is comparatively stronger, making local coordination more viable.

Six Threats Organizations Face During Rainy Season

Infrastructure and supply chain failure
Floods damage roads, bridges, and warehousing facilities, often simultaneously. Supply chains that depend on a single transport corridor are highly vulnerable. Organizations in extractive industries, humanitarian operations, and consumer goods distribution are most exposed. Recovery timelines after significant infrastructure damage can stretch to months.
Employee safety and facility damage
Floodwater entering facilities damages equipment, destroys materials, and creates immediate hazards for staff on site. Low-lying facilities or those near riverbanks face the highest risk. Organizations without flood risk assessments for their sites cannot quantify this exposure.
Transport disruption blocking staff movement
When roads flood, employees cannot move, either to get to work, evacuate, or reach safety. This is not a productivity issue; it becomes a duty-of-care issue. Organizations with staff in remote or flood-prone areas must have pre-positioned transport contingencies, not post-event improvisation.
Communication blackouts
Power line damage and infrastructure flooding disrupt phone and internet connectivity. When communications go down, organizations lose the ability to locate, direct, and support employees. This makes pre-event check-in protocols and offline communication systems critical.
Waterborne and vector-borne disease outbreaks
Flooding creates conditions for the rapid spread of cholera, typhoid, and malaria. These are not background risks; they are foreground operational threats. An outbreak among a workforce can collapse project timelines, trigger medical evacuations, and overwhelm local healthcare capacity simultaneously. In 2025, 115 health facilities across the region were damaged by flooding, limiting response capacity when it was needed most.
Business continuity and financial exposure
The combination of infrastructure failure, staff immobility, communication loss, and health outbreaks creates compounding financial losses. Organizations without pre-tested continuity plans face the full economic impact; those with plans absorb far less damage.

What Organizations Should Do Now

Rainy Season Infographic

Conduct a flood risk assessment for all sites
Identify which facilities, access routes, and staff accommodations are in flood-prone zones. This is the foundation of every other decision.
Map alternative transport routes before the season begins
Identify secondary and tertiary roads that avoid riverbanks and low-lying crossings. Pre-brief drivers and transport coordinators.
Establish offline communication protocols
Use satellite phones, scheduled radio check-ins, or predetermined rally points for staff in areas where mobile networks are likely to fail.
Activate a tested evacuation plan
An untested evacuation plan is not an evacuation plan. Run a tabletop exercise before May. Identify evacuation triggers, responsible personnel, and routes.
Brief staff on health protocols now
Ensure malaria prophylaxis is current. Issue guidance on water safety, food handling, and when to seek medical attention. Make sure medical evacuation arrangements are in place.
Issue and track travel advisories in real time
Cross-reference local authority alerts with independent security intelligence. Do not rely on a single source during a fast-moving flood event.
Use a business continuity plan that has been stress-tested
Identify which functions can operate remotely, which require physical presence, and what minimum viable operations look like during a severe disruption.
Calibrate contingency planning to country risk tier
In high-risk countries, assume local emergency response will be under strain. Plans need to be self-sufficient, with pre-positioned supplies, independent communications, and confirmed medical evacuation routes. In medium-risk countries, coordination with local authorities is more viable, but organizations should maintain their own plans regardless.