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Oman generally has high temperatures and humidity all year round. May to September are the hottest months, with temperatures occasionally reaching up to 122°F (50°C), but averaging 100°F (38°C). The extreme heat experienced at this time of the year puts expats at risk of heatstroke and exhaustion, so sensible health and safety precautions are advised. The cooler months of November to March, on the other hand, see pleasant temperatures, averaging 68°F (20°C).
The south coast experiences its rainy season between June and September, and in the Jabal Akhdar and lowlands of the north, rain can fall at any time of the year.
Oman is occasionally affected by tropical cyclones. These storm systems, which originate over the Arabian Sea, typically dump high amounts of rain on the country, which can result in severe flash flooding.
Weather in Oman is often unaccounted for as a hardship factor, but expats should keep this in mind when negotiating an employment contract.