It may have cost much more to fill up at the pump last month, but consumers were not letting that affect spending in other areas. According to NRF, retail industry sales for August (which exclude automobiles, gas stations, and restaurants) rose a strong 7.9% unadjusted over last year and increased 0.5% seasonally adjusted from July. The gains, compared to a relatively weak August last year, were stronger than NRF had been expecting.

“Though gas prices are a concern, the August report is further proof that it is unwise to base retail sales projections on one economic indicator,” said NRF chief economist Rosalind Wells. “Retailers who were anxious about the upcoming holiday season may be breathing a little easier.”

August sales released today by the U.S. Commerce Department show that total retail sales (which include non-general merchandise categories such as autos, gasoline stations and restaurants) dipped 2.1% seasonally adjusted from July due to weak auto sales, and increased 9.5% unadjusted year-over-year. Gasoline sales, which NRF does not include in its calculation of retail industry sales, rose 31.3% unadjusted from last August.

Though the U.S. Commerce Department could not specifically quantify the influence of Hurricane Katrina, it said the impact would have been minimal because the affected area accounted for slightly more than one percent of total retail sales. Also, because Hurricane Katrina hit at the end of the month, any impact in August was small.

All retail industry sales categories saw substantial growth last month. The back-to-college season led to strong sales for furniture stores, which rose 0.9% adjusted from the previous month and climbed 7.9% over last year. Electronics and appliance sales were also strong last month, led by college student spending. Sales at those stores rose 0.3% adjusted from July and 7.1% unadjusted from last August. Sales were also very strong at health and personal care stores, which saw gains of 1.2% adjusted from July and 10.7% over last year. Building materials and garden equipment and supplies dealers continued to see strong year-over-year growth with sales climbing 0.5% adjusted from July and an impressive 11.4% over last August.

NRF estimates that combined back-to-school and back-to-college sales were $47.8 billion this year.