Weather in Oman
Like the rest of the Persian Gulf, Oman generally has one of the hottest climates in the world—with summer temperatures in Muscat and northern Oman averaging 30 to 40 °C (86.0 to 104.0 °F). Oman receives little rainfall, with annual rainfall in Muscat averaging 100 mm (3.9 in), falling mostly in January. In the south, the Dhofar Mountains area near Salalah has a tropical-like climate and receives seasonal rainfall from late June to late September as a result of monsoon winds from the Indian Ocean, leaving the summer air saturated with cool moisture and heavy fog. Summer temperatures in Salalah range from 20 to 30 °C (68.0 to 86.0 °F)—relatively cool compared to northern Oman.The mountain areas receive more rainfall, and annual rainfall on the higher parts of the Jabal Akhdar probably exceeds 400 mm (15.7 in). Low temperatures in the mountainous areas result in snow cover once every few years.
The climate of Muscat features a hot, arid climate with long and very hot summers and warm winters. Annual rainfall in Muscat is about 100 mm (4 in), falling mostly from December to April. The climate is very hot, with temperatures reaching as high as 46 °C (120 °F) in the summer. The day time temperature in Muscat during winter season is 23-26°C and night will be cool around 13-17°C.For sightseeing, the best time to visit Muscat is from December to March as the temperatures are moderate and pleasant, making it easy to move around.
Mountains surround Nizwa from every side and there are some outstanding mountain scenery close by. Nizwa has an arid climate under Köppen's climate classification. In the winter from November until March the climate is pleasant with temperatures as low as 12 C in January. In the summer, the climate is hot and dry with temperatures reaching 45 C in July
The city has a hot desert climate (Köppen climate classification BWh), although summers are cooler than in more northern or inland parts of Oman. Salalah is very cloudy and foggy during the monsoon months of July and August, even though relatively little rain falls. Khareef means "autumn" in Arabic but it refers to monsoon when describing the region around Salalah. During this time, the brown landscape of Salalah and its surroundings is completely transformed to a beautiful and lush greenery
Suhar has a hot desert climate (Köppen climate classification BWh) with very hot summers and mild winters. Precipitation is low; more than half of the year's total rainfall falls in February, and summers are almost completely dry.
Average temperatures in Barka vary greatly. Considering humidity, temperatures feel hot for about half of the year and otherwise nice with a very low chance of rain throughout the year. The area is somewhat temperate — in the 52nd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Barka, the hottest months are July, June, and then August.
Sur experiences a hot desert climate with very little rainfall and high temperatures. Because of its coastal location, Sur's night-time temperatures are never very low. There is no distinct wetter season, but March tends to be the wettest month, and September the driest.