May 12 (Reuters) - Gulf stocks closed higher on Monday after the United States and China agreed to temporarily reduce tough mutual tariffs, while U.S. President Donald Trump's planned visit to Saudi Arabia and Gulf states on Tuesday boosted investor confidence.

The United States and China said Monday, following talks in Geneva, that Washington will reduce the additional tariffs it imposed on Chinese imports in April to 30 percent from 145 percent, and that Chinese tariffs on US imports will fall to 10 percent from 125 percent. The new measures will be in effect for 90 days.

Saudi Arabia's benchmark stock index rose 1.3 percent, its biggest gain in a month, with nearly all sectors rising.

Saudi Aramco shares rose 2.2 percent after the world's largest oil exporter reported a net profit of 97.54 billion riyals ($26.01 billion) in the first quarter on Sunday, exceeding the average estimate of 16 analysts, which amounted to $25.36 billion.

National Industrialization Company's shares also rose 1.1 percent after the petrochemical company reported quarterly net profits, compared to a net loss a year earlier.

Sources told Reuters that Saudi Arabia and the United States will discuss a number of major economic deals during Trump's visit on Tuesday, as the United States prepares to present a package of arms deals to Saudi Arabia worth more than $100 billion.

The Qatari market's main index extended its three-day winning streak, rising 0.7 percent, with most stocks posting gains. Shares of Qatar National Bank, the region's largest bank, rose 2 percent, and Qatar Electricity and Water Company rose 4 percent, their biggest gain in more than a year.

Qatar Electricity and Water Company (Kahramaa), the main provider of electricity and desalinated water in Qatar, announced on Monday that it has signed a strategic agreement with Qatar Electricity and Water Company (QEWC), Qatar Power Company (Qatar Power) and Sumitomo Corporation to build the Ras Abu Fontas Independent Water and Power Plant (IWPP) at a cost of QAR 13.5 billion (US$3.71 billion).

Dubai's main index gained 0.4 percent, supported by a 7.3 percent rise in Barkin shares and a 2.8 percent rise in Talabat Holding shares. Talabat, the food delivery company, reported net profits of $103.3 million in the first quarter.

The Abu Dhabi Securities Exchange's benchmark index rose 0.1 percent, supported by a 1 percent rise in Aldar Properties shares.

Fertiglobe shares rose 2.2 percent. The fertilizer producer signed an asset sale and purchase agreement to acquire the distribution assets of Wingfo Australia.

Outside the Gulf region, Egypt's blue-chip index rose 0.5 percent after three consecutive sessions of losses.

Commercial International Bank shares rose 1.1 percent, while Abu Dhabi Islamic Bank Egypt shares rose 3.6 percent. The banks announced a 43 percent increase in first-quarter net profit.

(USD = 3.6727 AED)

(Dollar = 3.7507 riyals)

(USD = 3.6412 Qatari Riyals)

(Prepared by Muhammad Harfoush for the Arabic edition - Edited by Hassan Ammar)