Wallis and Futuna
Narrative updated. “Strong El Niño, weak local signal: Wallis and Futuna's dry season holds near normal as the region braces for health and climate fallout”
Pacific health and environment agencies used the One Health platform in October 2026 to warn that El Niño threats are becoming reality across the region, with the WHO-led coalition urging cross-sector readiness for climate-sensitive disease and environmental risks. For Wallis and Futuna the local signal remains weak: measured rainfall for 9 July–6 October 2026 was about 4% below the 1991–2020 normal and mean temperature 0.6°C below normal, both within the range expected for the May–October dry season. The practical focus is therefore the onset of the November–April wet season, which will determine water recharge and the main agricultural growing period.
276.2 mm vs 288.4 mm normal
Measured rainfall for 9 July–6 October 2026 ran about 4% below the 1991–2020 normal, but this window falls in Wallis and Futuna's climatological dry season (normally under 20 mm), so the meaningful question is whether the coming wet-season rains arrive on time.
26.58°C mean vs 27.19°C normal
Mean temperature for the same window came in 0.6°C below normal, a cool anomaly that sits awkwardly beside the strong El Niño signal (ONI +2.16) highlighted in the Pacific One Health coverage.
With the dry season (May–October) still in force, planting calendars remain on schedule, and the key watch point is the onset of the November–April wet season that drives the main growing period.
NASA POWER (MERRA-2) reanalysis, 9 Jul 2026 – 6 Oct 2026, sampled at the country centroid (-13.3°, -176.2°). Normals are 1991–2020. How this is computed
When it matters
Agricultural calendar for Wallis and Futuna and where the El Niño impact window falls
Last 12 months vs normal
Observed monthly rainfall against the 1991–2020 climatology
Sector by sector
Dry-season conditions are near normal and planting calendars remain on schedule, but a late or weak wet-season onset would delay the main November–April growing period.
With the dry season still running and rainfall only marginally below normal, household and communal rainwater catchments are likely to hold adequate reserves until the wet season begins.
The One Health coalition warns that El Niño amplifies climate-sensitive disease risks, including waterborne and vector-borne illness, making surveillance and nutrition monitoring the priority.
Cooler-than-normal conditions (-0.6°C) should keep electricity demand for cooling modest, while diesel-dependent generation remains exposed to any supply disruption.
El Niño-driven shifts in regional ocean temperatures may push pelagic tuna stocks eastward, potentially reducing nearshore and offshore catch availability for local fishers.
What happened last time
Past El Niño episodes and how Wallis and Futuna responded. See the full ENSO timeline →
2023-24
A strong El Niño event raised regional concern over drought and food security, though Wallis and Futuna's impacts were comparatively limited.
unsourced background2015-16
A powerful El Niño contributed to regional drought stress and reduced agricultural yields across the Pacific, prompting water conservation measures in several island territories.
unsourced background1997-98
One of the strongest El Niño events on record brought drought and water shortages to many Pacific island states, with Wallis and Futuna experiencing below-normal rainfall during its wet season.
unsourced backgroundLatest coverage
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