US natural gas futures fell 3.3% on Tuesday, settling at $3.147 per million British thermal units on Nymex, as two bearish forces hit the market at once. Weather models shifted cooler, trimming expectations for air-conditioning demand, while Kinder Morgan’s Gulf Coast Express pipeline expansion entered service—opening a new outlet for gas out of the already-oversupplied Permian Basin.

Futures settle lower as multiple bearish factors converge

The 10.6-cent drop brought July delivery futures to $3.147 per million British thermal units on NYMEX—a meaningful single-session move that reflected more than one pressure point. Cooler weather outlooks, new pipeline infrastructure, and softer LNG export flows all arrived on the same day, giving sellers clear reasons to act.

Darrell Fletcher, managing director of commodities at Bannockburn Capital Markets, noted that falling prices in the cash—or daily—gas markets may also be weighing on futures. When spot prices weaken, traders often revise near-term futures positions downward to stay aligned with current market conditions.

No single factor dominated Tuesday’s selloff. Several bearish signals arrived simultaneously and reinforced each other, making the decline hard to resist.

Cooler weather forecasts reduce expected cooling demand

Weather models were a primary driver. According to WeatherDesk, the GFS forecast shed nine cooling degree days over the prior 12 hours—a notable revision in a short window. Cooling-degree days measure how much temperatures exceed a baseline comfort level and serve as a standard proxy for air-conditioning demand.

Commodity Weather Group forecasts below-average temperatures in the mid-Atlantic region from June 23 through June 27, a stretch when summer heat typically pushes electricity consumption—and gas-fired power generation—higher. Fewer cooling-degree days mean less electricity demand for air conditioning, which means gas-fired power plants burn less fuel. The chain from weather forecast to futures price is direct and well understood, which is why even a moderate model shift can move markets quickly.

Kinder Morgan pipeline expansion adds Permian Basin supply to market

On the supply side, Kinder Morgan’s Gulf Coast Express pipeline expansion entered service Tuesday. The project increases takeaway capacity from the Permian Basin, one of the most productive — and most gas-saturated — regions in the country.

The Permian has long produced more associated natural gas than its pipeline network could easily move. Tight takeaway capacity sometimes forces producers to flare excess gas or accept deeply discounted local prices. Additional capacity changes that equation, allowing more gas to flow outward into broader regional markets. Lower-48 dry gas production on Tuesday ran at approximately 111.6 billion cubic feet per day, up 3.1% from a year earlier — underscoring how much supply stands ready to fill new infrastructure the moment it opens.

LNG flows dip, adding to domestic supply pressure

Exports offered little relief. Estimated gas flows to US LNG export terminals on Tuesday came in at approximately 19.1 billion cubic feet per day, down 1.7% week-over-week. Modest in percentage terms, but that decline represents real volumes of gas that stayed in the domestic market rather than moving overseas.

LNG exports have functioned as a key pressure valve for US natural gas in recent years — when export demand is strong, it pulls supply out of the domestic system and supports prices. When flows ease even slightly, that gas remains available at home. Total lower-48 gas demand on Tuesday was approximately 72.8 billion cubic feet per day, down 10% year-over-year, a shortfall that, set against rising production, reflects a market carrying more supply than it currently needs.

Background: Permian oversupply and seasonal demand context

The Permian Basin’s role in Tuesday’s move is nothing new. For years the basin has generated substantial volumes of associated gas—produced alongside crude oil—that outpaced available pipeline capacity. Infrastructure buildouts like the Gulf Coast Express expansion are designed to address that bottleneck, but each addition also delivers a fresh wave of supply to downstream markets.

Cooling-degree days are calculated by measuring how far average daily temperatures rise above a 65-degree Fahrenheit baseline, giving traders and utilities a consistent way to estimate residential and commercial energy demand during warm months. Throughout 2026, US natural gas prices have stayed sensitive to short-term weather shifts and infrastructure changes, repeatedly responding to forecast revisions within hours as traders closely monitor meteorological models during the summer demand season.

Cooler weather will cut the demand for cooling power

Tuesday’s decline was the product of several converging factors rather than a single catalyst. Futures for July delivery settled at $3.147 per million British thermal units, down 3.3%, as cooler weather forecasts cut expected cooling demand and Kinder Morgan’s Gulf Coast Express expansion added new Permian Basin takeaway capacity. LNG export flows dipped modestly at the same time. Domestic production continued running above year-ago levels while total demand trailed last year’s pace by a significant margin, and weakness in cash market prices added further downward pressure on futures, according to Bannockburn Capital Markets.

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