Gold prices climbed on Monday as the dollar weakened, with investors awaiting further details on US President Donald Trump's reciprocal tariff plans, which could escalate global trade tensions.

Spot gold was up 0.6 percent at $2,900.47 per ounce, as of 0536 GMT. US gold futures gained 0.4 percent to $2,912.

The dollar index hovered near a two-month low as traders assessed recent weaker-than-expected US economic data.

A weaker US dollar makes bullion more affordable for holders of other currencies.

Gold is being supported by the dollar's weakness and uncertainty over how Trump will engage with major trading partners in enforcing his trade tariff policy, said Kelvin Wong, OANDA's senior market analyst for Asia Pacific.

Trump renewed his tariff threats on Friday, saying that levies on automobiles would be imposed as early as April 2. Last week, Trump instructed commerce and economic officials to study reciprocal tariffs against countries that impose tariffs on US goods, with recommendations due by April 1.

Meanwhile, US Secretary of State Marco Rubio said on Sunday that Ukraine and Europe would be part of any "real negotiations" to end Moscow's war.

"If talks between US and Russian officials improve the odds for a peace deal being reached that ends the war, safe-haven buying demand could wane, which could see gold lose some of its impetus," said Tim Waterer, chief market analyst at KCM Trade.

"But with tariff and inflation talk still a worry for investors, gold could still rally even if safe-haven flows recede."

Bullion is viewed as a traditional hedge against rising prices and geopolitical uncertainties.