Oman - Climate and when to go to Oman

Climate
With the exception of Dhofar region, which has a light monsoon climate and receives cool winds from the Indian Ocean, the climate of Oman is extremely hot and dry most of the year. Summer begins in mid-April and lasts until October. The highest temperatures are registered in the interior, where readings of more than 50° C in the shade are common. On the Al Batinah plain, summer temperatures seldom exceed 46° C, but, because of the low elevation, the humidity may be as high as 90 percent. The mean summer temperature in Muscat is 33° C, but the gharbi (literally, western), a strong wind that blows from the Rub al Khali, can raise temperatures from the towns on the Gulf of Oman by 6° C to 10° C. Winter temperatures are mild and pleasant, ranging between 15° C and 23° C.  

When to go
The best time to visit Oman is from September through April when temperatures average around 23°C in the day and 17°C in the evening. The months between May and August are particularly hot rising to 43°C with high humidity. Rainfall varies according to the region. Muscat tends to be dry, while Salalah receives monsoon rains from May to September.