In Lisbon, the average temperature during the day reaches a high of 72 degrees Fahrenheit and at night dips down to around 57 degrees Fahrenheit. This time of year has higher than usual humidity rates, averaging from 68 to 80 percent, but it's not terribly uncomfortable since the temperatures are mild. Expect rain for about half of the days of the month.

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In October, it is best to dress in layers. You may leave the morning with a pullover on, then by midday, it may warm up enough that you can remove it. The evenings usually cool down to the point where you will wear it again. You may feel like you want to wear shorts on a few warmer days, but you would be better off in jeans or long pants in case of rain.

Bring a sweater and a light jacket. Comfortable closed-toe shoes, or a pair of sneakers, are the best option for touring Lisbon’s steep paved streets. You may want to pack an umbrella.