The physical natural gas market advanced in the final full week of August, supported by scorching heat across the southern reaches of the United States and supply interruptions that temporarily stalled flows to the Southwest and Southern California.

At a Glance

• The Southwest led all regions in price gains.
• Cooling demand endured as late-summer heat persisted.
• Total supply remained robust.

The week's gains were fueled by competition for supply as heat drove strong cooling demand across southern markets while temporary disruptions constrained deliveries to the Southwest and Southern California. The heat-driven demand extended beyond US borders, with Mexico's natural gas imports from the United States averaging over 8 Bcf/d as scorching temperatures in the northern part of that country boosted cooling loads — adding to the pull on supply serving southern hubs.

The demand strength also showed up in storage. Operators in the South Central region drew heavily on supply in storage during the week ended Aug. 21 as sweltering heat and recovering LNG activity put upward pressure on demand, one of the leanest storage builds of the summer.

The spot-market strength, however, proved sensitive to shifting weather patterns. By Friday, physical prices fell at most hubs as cooler weather unwound the Desert Southwest's late-week price spike — Arizona cash prices plunged $4 — while the eastward-shifting heat dome lifted Louisiana and Southeast hubs. Natural gas futures likewise pulled back as cooler early September weather trends undercut demand expectations, signaling that the late-summer price support hinges heavily on how long the heat persists.

Related Coverage from NGI

• Is the Cheap Natural Gas Advantage for Ammonia Producers Shrinking? — Regional natural gas basis advantages for US ammonia producers are tightening heading into the fall, tightening production margins in key markets. (Daily Gas Price Index, NGInsights, Aug. 31, 2026)

• Heat, LNG Counter Supply as Natural Gas Futures Launch Trading Week — Natural gas futures hovered on both sides of even early Monday as market participants contrasted elevated cooling demand and solid LNG volumes against healthy levels of supply. (Daily Gas Price Index, Markets Report, Aug. 31, 2026)

• Arizona Natural Gas Cash Plunges $4 as West Cools, Heat Shifts East — Physical natural gas prices fell at most hubs Friday for delivery through Monday as cooler weather unwound the Desert Southwest's late-week price spike, while the eastward-shifting heat dome lifted Louisiana and Southeast hubs. (Daily Gas Price Index, Markets Report, Aug. 28, 2026)

• Natural Gas Futures Ease as October Takes Prompt Baton — Natural gas futures pulled back Friday as cooler early September weather trends undercut demand expectations and Thursday's rally stalled short of $3, outweighing persistent late-summer heat and the leanest storage builds of the summer. (Daily Gas Price Index, Markets Report, Aug. 28, 2026)

• Intense Heat Propels Mexico's Natural Gas Imports — Mexico's natural gas imports from the United States averaged over 8 Bcf/d since Monday as scorching temperatures in the northern part of the country drove cooling demand. (Daily Gas Price Index, Exclusive, Mexico Natural Gas Prices, Aug. 28, 2026)

• South Central Natural Gas Storage Shrinks as Strong Demand Dictates Withdrawal — Operators in the South Central region drew heavily on supply in storage during the week ended Aug. 21 as sweltering heat and recovering LNG activity put upward pressure on demand. (Daily Gas Price Index, Natural Gas Storage, Aug. 28, 2026)

This article was reported by Kevin Dobbs for Natural Gas Intelligence (NGI). The original report is available at: https://naturalgasintel.com/news/weekly-natural-gas-spot-prices-advance-as-southwest-heat-supply-disruptions-fuel-competition/