Gas Prices Just Hit a Record High for August. Here's Why.
The US national average for a gallon of regular gasoline reached $4.06 on August 17, 2026 — the highest ever recorded for August, according to AAA data (The Guardian). That was five cents above the prior week and about one dollar more than a year earlier, when the average was $3.1381. Diesel averaged $5.4454 per gallon nationally. In California and Hawaii, regular gasoline approached $5.50 a gallon.
The reason is a war. The United States and Iran have been at war since late February 2026, fighting over Iran's nuclear program. The two sides had 60 days to reach a peace agreement. They missed that deadline (The Guardian). President Donald Trump, asked about the timeline on Fox News, said: "I have no time schedule. I'm not in a hurry." On the same day, Trump threatened to bomb Oman — a country that has helped Washington and Tehran talk to each other behind the scenes — if it "gets in the way."
A key piece of the puzzle is the Strait of Hormuz. It is a narrow strip of water between Iran and the Arabian Peninsula, and about one-fifth of all the world's oil passes through it. Think of it as a toll booth on a highway: if the booth is blocked, traffic stops. The strait was blocked during the war, and disruptions continue. On August 14, the US warned Iran it would step up economic pressure after two more ships were attacked near the strait, according to Reuters. That same day, Washington said it could maintain its naval blockade on Iran for as long as it wants. Shipping traffic through the strait remained limited, and oil prices settled at $88.52 a barrel (Reuters). Oil prices rose on August 14 and were on track for weekly gains.
Brent crude, the main reference price for oil worldwide, spiked to $112 a barrel in March 2026 — a level not seen since 2022 — before dropping to around $85. That is still about 30% higher than a year earlier (The Guardian). AAA data shows gas prices have been bouncing around. They jumped 15 cents to $4.09 in the week of July 23, fell three cents to $4.06 by August 6, and were climbing again by August 13 (AAA). For comparison, AAA's all-time recorded high for regular unleaded was $5.0165 on June 14, 2022.
Efforts to negotiate peace have been just as unsteady. Qatar reported on August 4 that mediators were making progress, which briefly drove oil prices lower, though Iran's stance remained uncertain (Reuters). By August 12, oil prices ticked upward as ship attacks continued and talks stalled.
The cost to American households is real. Over the first six months of the war, Americans paid an estimated $56.4 billion in extra gasoline costs, or $477 more per household, according to the congressional Joint Economic Committee, which used AAA data (The Guardian). A Harris Poll conducted in May 2026 found half of Americans struggling with the cost of groceries and gas, with an overwhelming majority calling it an affordability crisis. Overall US inflation did cool in July 2026, driven by a temporary easing of energy prices, though consumer prices remained elevated compared to a year earlier.
Meanwhile, the eight largest oil companies — Aramco, BP, Shell, Equinor, TotalEnergies, Eni, Chevron, and ExxonMobil — made $90 billion in combined profits during the first full quarter of the war, March through June 2026. That works out to about $700,000 in profit every minute over that period (The Guardian).
The broader context here is a supply chain that has been under strain for nearly six months. The Strait of Hormuz has been disrupted the entire time, limiting how much oil reaches the global market. Oil prices have come down from their March peak but remain far above where they were before the war, and the diplomatic process has not produced a ceasefire, which is a formal agreement to stop fighting. Trump's threat against Oman adds a new concern: if Oman can no longer help mediate, the already limited channel for peace talks between Washington and Tehran could shrink even further. The 60-day deadline has been missed, no new plan has been made public, and the US has said it is willing to keep its blockade in place indefinitely. All of this means the conditions keeping energy prices high are still in place. AAA's August 13 report, noting prices back on the rise after a brief weekly dip, suggests the recent drop in oil prices may already be reversing.
