In October, Muscat experiences pleasant weather as it transitions from the hot summer months to the milder winter season. The climate in Muscat during October can be described as warm and comfortable, making it an ideal time to visit the city and explore its attractions.

The average daytime temperature in October ranges from around 28°C to 35°C (82°F to 95°F). While it can still feel warm during the day, the intensity of the scorching summer heat starts to subside. Additionally, the evenings and nights are relatively cooler, with temperatures dropping to around 22°C to 26°C (72°F to 79°F), providing some relief from the daytime warmth.

October is also a dry month in Muscat, with very little rainfall. This means you can expect mostly clear skies and plenty of sunshine, making it an excellent time for outdoor activities and sightseeing.

The official currency of Oman is the Omani Rial, abbreviated as OMR. 

When visiting Muscat or any other part of Oman, it is advisable to exchange your currency for Omani Rials to avoid any inconvenience. Currency exchange services are available at airports, banks, exchange bureaus, and some hotels.

Please note that while major credit cards are widely accepted in larger establishments like hotels, restaurants, and shopping malls, it's always a good idea to carry some cash, especially when visiting smaller markets, local shops, or remote areas where card acceptance might be limited.

In Muscat and Oman, the dress code is generally modest and conservative, influenced by the country's cultural and religious traditions. While the dress code is not as strict as in some neighboring countries, it is essential to respect the local customs to ensure a smooth and pleasant experience during your visit.