Switzerland
Score moved 3 → 4 (minimal impact → moderate impact). “UN agencies warn this El Niño could be the strongest in decades — Switzerland's warm, dry autumn is already showing the fingerprint”
The World Meteorological Organization and UN agencies warned through 2026 that El Niño would strengthen to 'very strong' or even 'off the charts' levels, raising the risk of extreme weather worldwide into 2027. For Switzerland the canonical El Niño signal is weak, yet the measured July–October 2026 window was 4.0°C warmer than the 1991–2020 normal with rainfall 52% below average — a warm, dry anomaly that fits the strong-event narrative even though the window is climatologically dry and the percentage is not itself meaningful. The practical concern is therefore the coming autumn and winter recharge rains, which will determine soil moisture, hydropower reservoirs and snowpack heading into the 2027 growing season.
182 mm vs 378.2 mm normal
Reanalysis shows rainfall across Switzerland from 9 July to 6 October 2026 ran 52% below the 1991–2020 normal, although this window falls in the climatological dry season when totals are normally under 20 mm, so the meaningful signal is the outlook for the autumn and winter recharge rains rather than the percentage itself.
18.92°C mean vs 14.95°C normal
Mean temperatures for the same July–October window came in 4.0°C above normal, an exceptional warm anomaly consistent with the strong El Niño teleconnection pattern described in the WMO and UN statements.
The spring planting (March–May), growing season (May–September) and harvest (August–October) calendar proceeded broadly on schedule, but the record-warm, dry late-summer window likely stressed unirrigated crops and pushed harvest forward in some lowland areas.
NASA POWER (MERRA-2) reanalysis, 9 Jul 2026 – 6 Oct 2026, sampled at the country centroid (47.0°, 8.0°). Normals are 1991–2020. How this is computed
When it matters
Agricultural calendar for Switzerland and where the El Niño impact window falls
Last 12 months vs normal
Observed monthly rainfall against the 1991–2020 climatology
Sector by sector
Unirrigated lowland crops and fodder face moisture stress after a 4°C-warmer, 52%-drier late summer, with autumn sowing dependent on the return of the recharge rains.
Reservoir and groundwater recharge hinges on the coming wet season; a delayed or weak autumn rain onset would tighten supplies after the dry July–October window.
Heat stress in the elderly and outdoor workers, plus expanded ranges for vector-borne and water-related pathogens, are the main El Niño-linked concerns.
Hydropower inflows depend on the autumn and winter precipitation pattern, while the warm anomaly has already trimmed early-season heating demand.
Warmer water temperatures in Swiss lakes and rivers raise the risk of low-oxygen episodes and thermal stress for cold-water species such as trout.
What happened last time
Past El Niño episodes and how Switzerland responded. See the full ENSO timeline →
2023-24
A strong El Niño contributed to a warm, variable Swiss winter with above-average temperatures and irregular precipitation, leaving mixed snowpack and reservoir conditions.
unsourced background2015-16
A strong El Niño coincided with a very mild Swiss winter and record-low seasonal snowfall at many stations, cutting ski-season revenue and reducing spring meltwater recharge.
unsourced background1997-98
One of the strongest El Niño events on record produced a mild, snow-poor Swiss winter and low Alpine snowpack, straining winter tourism and early-season hydropower reserves.
unsourced backgroundLatest coverage
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Strong El Niño Locks In a Warm, Dry Swiss Autumn as UN Warns of Decades-Strongest Event
The World Meteorological Organization and UN agencies warned through 2026 that El Niño would strengthen to 'very strong' or even 'off the charts' levels, raising the risk of extreme weather worldwide
Nearby
Neighbouring countries