A Wet East, A Baked South, and a Shrinking Harvest Window: What El Niño Means for Farmers This Fall

A massive late-summer heat wave is bringing near-record temperatures and high humidity across the Midwest. And it’s not just a week straight of near-100-degree days. The high nighttime temperatures are also a growing concern.

In the High Plains, that heat has been an unwelcome guest all summer. Consecutive 100-degree days is what aided the damage, with the National Weather Service saying this week that Abilene, Texas, set a new record for most consecutive 100-plus-degree days, at 31.

If it feels like this growing season has thrown two completely different years at farmers depending on where they sit on the map, that’s because it has. And according to Nutrien Ag Solutions Senior Atmospheric Scientist Eric Snodgrass, the divide between the drenched Eastern Corn Belt and the scorched Southern Plains is about to collide with a harvest season that could close faster than farmers have grown used to.

Record Rain in the East, Record Heat in the South

Snodgrass says the numbers coming out of the Eastern Corn Belt this August are staggering. Widespread areas picked up more than a foot of rain last month alone — on top of spots in Illinois, Indiana and eastern Iowa that had already logged over a foot back in June.

“When you just examine the statistics for this growing season, starting in May and going all the way till now, these climate reporting districts across parts of the Central and Eastern Corn Belt are showing some of the wettest conditions we’ve ever had for a growing season,” Snodgrass adds.

That saturation is showing up in the field. Scouts working the Pro Farmer Crop Tour last week found crown rot, weak stands and signs of nitrogen loss in fields that simply couldn’t hold onto nutrients through repeated deluges.

Meanwhile, the story couldn’t be more different across Oklahoma, Texas, Kansas and the lower Mississippi River Valley, where some areas haven’t measured a drop of rain in a month and have baked under daily highs of 105 to 110 degrees. Snodgrass said the toll is more than agronomic — it’s personal. One Oklahoma grower, who asked to remain anonymous, told him he’s done fighting it and is considering relocating his farming operation altogether because of how routinely extreme the heat has become.

A Quiet Hurricane Season For the U.S.... For Now

Farmers in the South have been watching the tropics for relief, and there’s at least a glimmer of one. Tropical Storm Dolly is spinning up in the open Atlantic and could bring beneficial rain to Puerto Rico. But broadly, this hurricane season has been a dud.

Snodgrass says accumulated cyclone energy, the standard measure of how active a season has been, which he says is running well below average even as the season nears its historical peak. He expects the season to finish at roughly half of normal activity.

While the Atlantic Sleeps, the Pacific Roars

If the Atlantic has been eerily calm, the Pacific is doing more than making up for it. This week brought a genuinely rare sight: three powerhouse cyclones — Hurricanes Lowell and Karina, trailed by Tropical Storm Marie — churning simultaneously across the Central and Eastern Pacific, all feeding off bathtub-warm ocean waters. Marie was on the verge of becoming the third hurricane in the lineup, which meteorologists say is the kind of “storm train” only a historically strong El Niño can produce.

It’s not a coincidence that the Pacific is stacked with storms while the Atlantic sits quiet. The same El Niño pattern suppressing Atlantic hurricane development, through stronger wind shear and a less favorable atmosphere, is the reason the Pacific is running hot.

Without El Niño in the picture this year, that energy could just as easily have been aimed at the Atlantic basin instead, potentially stacking storms against the Gulf and East coasts rather than out over open Pacific water. It’s a reminder of just how much influence this El Niño is exerting on the global storm pattern, and it’s also why Snodgrass keeps pointing back to it as the driver to watch heading into fall.

El Niño: Still the Strongest on Record

Behind all of it sits El Niño, which Snodgrass describes as the strongest event on record, and one that will increasingly shape both the short-term and long-term forecast as the season progresses.

In the immediate term, heat currently parked over Texas is expected to push into the Midwest as August turns to September, but Snodgrass cautions that September heat behaves very differently than the heat of July or early August. The bigger concern is the dry pattern setting up from Texas through the Ohio Valley just as the crop needs to finish grain fill and dry down. Snodgrass said confidence in the September outlook itself is low right now, with no single dominant signal driving the pattern. El Niño, he said, is “in the background at this stage” and will become a bigger player later in the fall.

Harvest Windows Could Shrink by 20%

Looking further out to the September–October–November window, both the European model and the Climate Prediction Center point toward a wetter-than-average finish for much of North America, with the Pacific Northwest and the far northern tier as possible exceptions. For farmers, that translates into a real logistical problem.

“It’s gonna tighten up our harvest windows, possibly in a significant way, maybe shaving off 20% of the days we normally have,” Snodgrass says.

He put real numbers behind that warning. Across the I-states, farmers typically count on about 40 good days between the start of harvest and the completion of fall fieldwork. In El Niño years, that window tends to shrink by about eight days, down to roughly 32.

“El Niño tilts the odds. It doesn’t say it’s perfectly gonna be that way — it just kind of moves the needle in that direction,” Snodgrass says. His advice: when the window opens this fall, run hard. After nearly five years of La Niña patterns that offered more forgiving, hot-and-dry falls, growers may not be used to a window that closes as quickly as this one could.

South America’s Wild Card

The forecast isn’t just a domestic story. Snodgrass is also watching a sharp contrast building in South America, where southern Brazil has been unusually wet while the Amazon and north-central Brazil stay dry. He expects that pattern to continue into the region’s planting season, with the monsoon likely arriving in fits and starts rather than settling in cleanly — a setup that could delay planting south of the equator just as U.S. farmers are racing to finish harvest.

“I don’t expect this monsoon season to just come on and stay on and be perfect. I think it’s gonna come in fits and starts, which could delay planting,” Snodgrass says.

What About an Early Frost?

On one point, Snodgrass offered some reassurance. Long-term statistical trends don’t point to elevated frost risk this year, and he doesn’t see El Niño shifting those odds in any meaningful way. Most of this year’s crop has already accumulated enough heat units that an early frost isn’t a major concern — outside of the far northern fringes well beyond the primary Corn and Soybean Belt.

What You need to Know About This El Niño Fall

Between a soaked Eastern Corn Belt still counting the agronomic cost of a record-wet season, a Southern Plains stretch pushed to its breaking point by heat and drought, and a strengthening El Niño poised to compress the fall fieldwork calendar, Snodgrass’s message to farmers is straightforward: don’t count on the leisurely, La Niña-style falls of the past several years.

When conditions line up to get in the field, get moving, because this year, the window may not stay open long.