United States
Narrative updated. “Forecasters call it 'not run-of-the-mill' — a record-strength El Niño is loading the dice for a stormy US winter”
NOAA confirmed El Niño has formed and forecasters expect it to strengthen toward historic, possibly record, intensity, with the UN weather agency also warning of a strong event. For the United States the canonical signal is mixed: a wet, stormy southern tier and California, a mild and drier north, and a suppressed Atlantic hurricane season. Measured conditions for July–October 2026 show rainfall about 21% below normal and temperatures roughly 3.5°C above normal, a warm, dry shoulder season that sets up the coming winter rains as the key variable to watch.
221.6 mm vs 281.4 mm normal
Rainfall across the United States ran about 21% below the 1991–2020 normal during the July–October window, though this period falls in the climatological dry season for much of the country, so the more meaningful signal is the forecast for a wet, stormy southern tier and California as the strong El Niño peaks in December–February.
News source27.53°C mean vs 24.01°C normal
Mean temperatures came in roughly 3.5°C above normal for the same window, consistent with the warm, mild pattern El Niño typically brings to the northern tier even as it loads moisture into the south.
News sourceThe May–September growing season proceeded largely on schedule, but the projected peak El Niño impact in December–February is expected to shape winter wheat dormancy, California orchard chill hours, and spring planting decisions for the 2027 crop year.
NASA POWER (MERRA-2) reanalysis, 9 Jul 2026 – 6 Oct 2026, sampled at the country centroid (38.0°, -97.0°). Normals are 1991–2020. How this is computed
When it matters
Agricultural calendar for United States and where the El Niño impact window falls
Last 12 months vs normal
Observed monthly rainfall against the 1991–2020 climatology
Sector by sector
California and southern-tier growers should prepare for heavy winter rains and flooding risk, while northern grain and corn belts may see milder, drier conditions that cut heating stress but trim soil moisture recharge.
Reservoir and snowpack managers in the West and Southwest are likely to see improved recharge from a wet storm track, though flood-control operations and levee stress become the countervailing concern.
Warmer-than-normal temperatures raise heat-stress and vector-borne disease concerns in the South, while heavy winter rains could increase flood-related injuries and waterborne illness risk.
A mild northern winter should reduce heating demand and natural gas draw, while storm-driven outages and flood risk rise across the South and California.
Warm coastal waters and shifted currents are expected to displace cold-water species such as salmon and squid along the Pacific coast, while Atlantic hurricane suppression may benefit Gulf and Southeast fisheries.
What happened last time
Past El Niño episodes and how United States responded. See the full ENSO timeline →
2023-24
A strong El Niño contributed to a wet California winter and active southern storm track, with a comparatively quiet Atlantic hurricane season.
unsourced background2015-16
A very strong El Niño delivered a wet California winter that eased drought but caused flooding, and again muted the Atlantic hurricane season.
unsourced background1997-98
One of the strongest El Niños on record brought torrential winter rains and mudslides to California and a stormy southern tier, while suppressing Atlantic hurricane activity.
unsourced backgroundLatest coverage
RSSNearby
Neighbouring countries