By Dan Strumpf 

A solid U.S. jobs report for July pushed the Dow to its lowest close since February, as investors geared up for an increase in interest rates as soon as September.

U.S. employers added 215,000 jobs in July, the Labor Department said Friday. The unemployment rate, in a separate survey, was steady at 5.3%. Both figures were in line with economists' expectations.

Investors have been scouring economic data, including Friday's jobs report, for guidance on the timing of the first increase in U.S. short-term rates in nearly a decade. Fed officials last month said they were looking for further improvement in the labor market before making such a move.

The Fed has signaled that its eventual increases in interest rates would be gradual. Still, uncertainty remains over how the market will adjust to slightly higher rates, as the central bank's low-rate policy has helped fuel the six-year bull market in stocks that has lasted since the financial crisis.

The Dow Jones Industrial Average fell for the seventh straight session in a row--its longest losing streak since August 2011--declining 46.37 points, or 0.3%, to 17373.38. That marks the lowest close for the blue chips since early February. The Dow is now down 2.5% for the year.

The S&P 500 fell 5.99, or 0.3%, to 2077.57, and the Nasdaq Composite declined 12.90, or 0.3%, to 5043.54. Both remain in positive territory for the year.

The energy sector suffered the day's biggest losses, losing ground as oil prices fell more than 1%. Energy stocks in the S&P 500 shed 1.9%.

Investors "are definitely going, 'OK, this is happening,'" said Tom Carter, managing director at brokerage firm JonesTrading. "People are positioning" for a rise in interest rates.

The odds of a rate increase--based on trading in federal-funds futures--at the September meeting were 56% Friday, compared with 46% before the jobs report and 48% Thursday, according to traders. Federal-funds futures are used by investors and traders to place bets on central-bank policy.

The odds of a rate boost at the December meeting were 79%, compared with 72% before the report and 73% on Thursday.

The July jobs report "without a doubt" shows the further improvement that the Fed was looking for in the labor market, said Jim Dunigan, chief investment officer at PNC Wealth Management, paving the way for a September rate increase.

But until the Fed actually makes a move, stocks are likely to remain rangebound, Mr. Dunigan said. He added that a rate increase would be positive for stocks, because it would reaffirm economic growth in the U.S. that should lead to higher corporate earnings.

Friday's decline closes out a downbeat week for U.S. stocks. The S&P 500 lost 1.3% this week following a tumble on Thursday that battered major media companies. Shares of Viacom Inc. have lost more than 20% this week after a disappointing earnings report Thursday.

Walt Disney stock is down nearly 8.9% on the week.

The recent declines have left the S&P 500 with a gain of just 0.9% for the year, after rising as much as 3.5% as recently as May. Major indexes have had trouble sustaining gains in 2015 in the face of an uneven U.S. economy, financial tumult in Europe, a slowdown in once-booming China and the prospect of rate increases.

The yield on the 10-year Treasury note fell to 2.173% compared with 2.22% before the jobs data release. Bond yields rise as prices fall.

Stocks remained lower in Europe. Germany's DAX lost 0.8%, while France's CAC 40 lost 0.7%, and the Stoxx Europe 600 index shed 0.9%.

In Asia, Japan's Nikkei Stock Average added 0.3%, while Hong Kong's Hang Seng Index rose 0.7%.

In commodity markets, gold futures added 0.4% to $1094.10 an ounce. Crude-oil futures declined 1.8% to $43.87 a barrel, its lowest level since March.

Write to Dan Strumpf at daniel.strumpf@wsj.com

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