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PRECIOUS-Gold hits over 4-month high as dollar index slumps to 3-year lows

* Speculators raise net longs in COMEX gold in week to Jan. 9

* Palladium hits new record high

(Updates throughout, adds LONDON dateline) LONDON, Jan 15 (Reuters) - Gold prices hit a four-month peak on Monday as the U.S. dollar index slumped to its lowest in three years but analysts warned the greenback's decline could be short-lived as it was not driven by fundamentals.

Spot gold was up 0.3 percent at $1,342.11 an ounce by

1045 GMT after touching its strongest since Sept. 8 at $1,344.44. The precious metal rose for a fifth straight week last week, gaining 1.4 percent.

U.S. gold futures were up 0.6 percent at $1,343.20

an ounce. "The weakness in the dollar is not justified by fundamentals. It's a little bit weird considering the divergence in monetary policy should play in favour of a stronger dollar," Capital Economics analyst Simona Gambarini said. She said the U.S. Federal Reserve is widely expected to raise interest rates, which would favour a stronger dollar, while the European Central Bank should keep rates on hold.

The dollar index was down 0.2 percent at 90.474,

having reached its weakest since January 2015 at 90.421. A lower greenback makes dollar-denominated assets such as gold cheaper for holders of other currencies, while higher rates could dent demand for non-interest-paying gold. "The main reason for the tight relationship between the dollar and gold is a lack of physical demand on the gold side in terms of ETFs (exchange-traded funds) and Indian and Chinese jewellery," said Carsten Menke, a Julius Baer commodity analyst. Adding a touch of bullishness to gold was data from the U.S. Commodity Futures Trading Commission on Friday, which showed that hedge funds and money managers raised their net long positions in COMEX gold and silver in the week to Jan. 9.

Iran's president said on Sunday the United States had failed to undermine a nuclear deal between Tehran and major powers, and hailed the accord as a "long-lasting victory" for Iran, state television reported. U.S. President Donald Trump on Friday delivered an ultimatum to European signatories of the deal to fix the "terrible flaws" of the agreement with Iran, or the United States would pull out.

Palladium rose 1 percent to $1,135 on Monday, after

hitting a record high of $1,138. The metal has seen a sustained rally from high demand in the auto industry amid a supply deficit, analysts said.

Spot silver rose 0.6 percent to $17.35 an ounce,

after touching a near three-month high at $17.42.

Platinum was up 0.3 percent at $996.95, after

touching its highest since Sept. 11 at $1,001.40.

(Additional reporting by Nallur Sethuraman in Bengaluru; Editing by Dale Hudson)