Mexico
Narrative updated. “A very strong El Niño is forecast for 2026-27, and Mexico sits squarely in its path”
Forecasters are warning that a very strong El Niño will dominate 2026-2027, with Mexico among the countries most exposed to its reshaped weather patterns. Reanalysis for 9 July–6 October 2026 shows rainfall 10% below the 1991–2020 normal and temperatures 1.4°C above normal, a warm, dry signal that matches the strong event described in the articles. The canonical El Niño response for Mexico is mixed — a wetter northern winter and weaker southern summer rains — and the coming months will test how well water, farm and energy systems absorb that split.
187.3 mm vs 207.2 mm normal
Reanalysis shows rainfall 10% below the 1991–2020 normal for 9 July–6 October 2026, a window that is climatologically Mexico's dry season, so the meaningful signal is the forecast for the coming winter rains rather than this percentage.
News source20.17°C mean vs 18.76°C normal
Mean temperatures ran 1.4°C above normal over the same July–October window, consistent with the strong El Niño warming reported in the articles.
News sourceSpring-summer planting and the June–September rains proceeded on schedule, but the strong El Niño is expected to weaken southern summer rains and shift the October–December harvest outlook toward a wetter north and drier south.
NASA POWER (MERRA-2) reanalysis, 9 Jul 2026 – 6 Oct 2026, sampled at the country centroid (23.0°, -102.0°). Normals are 1991–2020. How this is computed
When it matters
Agricultural calendar for Mexico and where the El Niño impact window falls
Last 12 months vs normal
Observed monthly rainfall against the 1991–2020 climatology
Sector by sector
A wetter north could favour winter wheat and irrigated crops, while weaker summer rains in the south are expected to stress rain-fed maize and beans through the October–December harvest.
Reservoir and aquifer recharge should improve in northern Mexico from winter storms, but southern basins face a projected rainfall deficit that could deepen drought conditions.
Warmer-than-normal conditions raise the risk of heat stress and vector-borne disease in the south, while heavier northern rains could increase waterborne illness and flooding injuries.
Above-normal temperatures and drier southern conditions are expected to lift summer cooling demand and hydropower stress, while a quieter Atlantic hurricane season reduces storm risk to Gulf oil and gas infrastructure.
Warming Pacific waters are likely to push tuna and other pelagic species poleward, disrupting catches along Mexico's Pacific coast while Caribbean and Gulf fisheries see calmer hurricane-season conditions.
What happened last time
Past El Niño episodes and how Mexico responded. See the full ENSO timeline →
2023-24
A strong El Niño contributed to Mexico's driest year on record in 2023, with widespread water restrictions in Mexico City and sharp losses in the northern livestock sector.
unsourced background2015-16
A powerful El Niño produced a wetter northern winter but intensified drought across southern Mexico, straining reservoirs and reducing agricultural output in Oaxaca and Chiapas.
unsourced background1997-98
One of the strongest El Niño events on record brought severe drought to southern and central Mexico, cut rain-fed maize yields and contributed to major wildfires during the dry season.
unsourced backgroundLatest coverage
RSSEl Niño Shapes North America Fall, Winter Outlook
Very Strong El Niño Forecast for 2026-27 Puts Mexico on Alert for a Split Weather Year
Forecasters are warning that a very strong El Niño will dominate 2026-2027, with Mexico among the countries most exposed to its reshaped weather patterns. Reanalysis for 9 July–6 October 2026 shows ra
The Pacific is churning with hurricanes. The Atlantic is quiet. Blame El Niño
Nearby
Neighbouring countries