The average gasoline price was $2.648, 30.2 cents higher than a month ago, according to motorist advocacy group AAA. Gasoline prices normally retreat after the US Labor Day holiday weekend.
Benchmark US gasoline futures fell more than 3 percent, however, as refineries restarted.
Research company IIR said US oil refiners would have an estimated 3.67 million barrels a day of capacity shut during the week to Sept. 8.
"The recovery from Hurricane Harvey has accelerated over the weekend, with prolonged dry weather helping the decline in flood levels," Goldman Sachs analysts led by Damien Courvalin wrote. Half of shut-in refinery capacity should be back online by Thursday, Sept. 7, they said.
Harvey killed more than 60 people, dumped more than 50 inches (127 cm) of rain and damaged 203,000 homes. About a quarter of US refining capacity was shuttered.
The Department of Energy had loaned more than 5 million barrels of oil from the US emergency reserve to four Gulf Coast refining companies.
Motiva Enterprises could restart partial production at the largest US oil refinery as early as this week, sources familiar with the plans said. The timeline for restarting full production remained uncertain, they said.
Marathon Petroleum Corp. restarted a crude unit at its Texas City refinery, energy information service provider Genscape said. Petrobras began to restart its refinery in Pasadena, Texas, outside of Houston.
Late Monday, Royal Dutch Shell Plc prepared to restart units at its Deer Park, Texas refinery.
Pipelines returned to service. Enterprise Products Partners said it restarted lines Monday; ?Colonial Pipeline Co said it planned to restart the gasoline line between Houston and Hebert, Texas on Tuesday.
Most port operations across the Gulf Coast oil and gas hub resumed, although many restricted vessel draft, according to the US Coast Guard.
The number of US Gulf oil and gas production platforms with evacuated personnel dropped to 14 from 30, a government agency said.
Oil companies began reporting potential earnings impacts of shuttered Eagle Ford shale drilling operations. EOG Resources Inc said third-quarter ?crude and condensate volumes would be lower than expected at 320,000 to 330,000 bpd.
Meanwhile, Hurricane Irma strengthened into a highly dangerous Category 5 storm and barreled toward the Caribbean and the southern United States. Irma, which threatened deadly winds, storm surges and flooding, threatens demand recovery more than refining capacity, Goldman Sachs said.