US natural gas prices backed off earlier highs in after-hours trading Thursday but stayed in positive territory as forecasts for hotter weather pointed to potentially stronger demand from power generators to fuel increased air-conditioning use and a smaller-than-expected inventory build.
The front-month October Henry Hub contract and the continuous contract rose by 1.08% to $2.905 per million British thermal units.
The September 2026 NYMEX contract expired Thursday afternoon at $2.907/MMBtu, its highest daily settlement since moving to the front of the curve last month, the Energy Buyers' Guide said. The settlement marked the highest September expiration since 2022 and the first contract since March to expire at a higher price than the corresponding 2025 contract, it said.
The October and continuous contracts were supported by forecasts for record-high temperatures across the Southwest through the weekend and by Commodity Weather Group forecasts calling for above-average temperatures across nearly the entire US from Sept. 1-10, Barchart said.
Criterion also said the Lower 48 weather outlook had shifted warmer, with temperatures rising 2.1 degrees Fahrenheit over the forecast period. The largest upward revisions were concentrated in the 11-15-day period, particularly across the Midwest, adding to expectations for stronger late-summer cooling demand, Aegis Hedging said.
Traders were also monitoring Tropical Storm Dolly, which was off the coast of northern South America and expected to reach the vicinity of Puerto Rico on Sunday.
Lower-48 state gas demand was 80.1 Bcf/d on Thursday, up 11.5% from a year earlier, Barchart said, citing BNEF data. US gas-fired power demand, however, remains below 2024 levels so far this year as renewables gain market share, the Energy Information Administration said. Gas accounted for 38.4% of total power generation in the first half of 2026, down from 38.5% in the first half of 2025 and 41.3% in the first half of 2024.
On the supply side, US Lower-48 dry gas production remained strong at 112.6 Bcf/d Thursday, up 3.8% year over year, according to Barchart.
Prices also drew support from a smaller-than-expected weekly storage build. US natural gas inventories rose by 15 Bcf in the week ended Aug. 21, versus expectations as high as 27 Bcf and well below the five-year average build of 33 Bcf for the week.
EIA projected US natural gas inventories would reach 3,985 Bcf at the end of October, the highest level in 10 years and 5% above the five-year average. Inventories are currently 6.7% above their five-year seasonal average, underscoring supply strength.
Estimated LNG feedgas flows were 19.5 Bcf/d Thursday, up 11.6% from a week earlier, according to BNEF. Freeport LNG accounted for much of the increase in feedgas demand as maintenance work appeared to be winding down. The facility nominated 2.1 Bcf/d Thursday morning, lifting total Lower-48 feedgas demand to 19.4 Bcf/d, Aegis said.
LNG production declined last week as lower output at the Corpus Christi export terminal more than offset gains at several other facilities, UBS strategists said Wednesday. Weekly production at Corpus Christi fell to 2,720 MMcf/d from 3,355 MMcf/d a week earlier and 3,147 MMcf/d a month earlier. UBS said.
Total LNG production for the week averaged 15,740 million cubic feet per day during the week, down from 16,142 MMcf/d a week earlier but slightly above the 15,693 MMcf/d recorded a month earlier, UBS analysts said.