President Trump announced a trade deal with South Korea on Wednesday, putting 15 percent tariffs on South Korean goods, much higher than they were just a few months ago but lower than Mr. Trump had threatened.

Under the terms, South Korea will make $350 billion in investments in the United States and purchase $100 billion of liquefied natural gas. Mr. Trump said in a social media post that South Korea’s president, Lee Jae Myung, would visit Washington in two weeks to make further announcements.

Mr. Trump had threatened to impose 25 percent tariffs on South Korea unless a deal was reached by Friday. In an important concession from Mr. Trump, South Korea’s car exports will face 15 percent tariffs, down from the rate of 25 percent that the president had already imposed on cars from most of the world.

The agreement follows other trade deals that have been concluded in Asia. Although many details remain to be hammered out, the White House has announced that goods from Japan and the European Union will face 15 percent tariffs, the Philippines and Indonesia 19 percent, and Vietnam 20 percent. Among the Asian countries still without agreements are Malaysia, Taiwan and Thailand.

India, a key American ally, is also without a deal, and Mr. Trump on Wednesday threatened it with a 25 percent tariff. The Trump administration and China have agreed to a truce after inflicting sharp trade penalties on one another in the spring.

Mr. Lee confirmed that South Korea had reached a trade deal with the United States. The deal “removes uncertainty” over the country’s export industries, he said in a social media post.