Yes

you do need a jacket based on the weather in Lisbon, Portugal 1 second ago

Why? Because the wind makes walking forward feel like moonwalking in reverse!
78°F25°C & Partly Cloudy

Wind is 14 mph23 km/h from the Northwest, gusting to 25 mph41 km/h
July 18
9am78°F25°C14 mph23 km/h NorthwestPartly Cloudy
10am78°F25°C15 mph24 km/h NorthwestMostly Clear
11am78°F26°C15 mph24 km/h NorthwestWindy
12pm77°F25°C15 mph25 km/h NorthwestWindy
1pm76°F25°C15 mph24 km/h NorthwestMostly Clear
2pm75°F24°C14 mph22 km/h NorthwestMostly Clear
3pm73°F23°C13 mph21 km/h NorthwestMostly Clear
4pm71°F22°C11 mph18 km/h NorthwestPartly Cloudy
5pm69°F21°C10 mph16 km/h NorthwestPartly Cloudy
6pm68°F20°C9 mph14 km/h NorthwestPartly Cloudy
7pm68°F20°C8 mph14 km/h NorthwestPartly Cloudy
8pm67°F19°C8 mph13 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
July 1764°F18°C78°F26°C12 mph20 km/h from NorthwestPartly CloudyPartly Cloudy
July 1864°F18°C78°F25°C10 mph17 km/h from NorthwestPartly CloudyPartly Cloudy
July 1965°F18°C78°F25°C9 mph15 km/h from WestPartly CloudyMostly Clear
July 2062°F17°C78°F25°C12 mph19 km/h from NorthMostly ClearClear
July 2165°F18°C83°F28°C13 mph21 km/h from NorthMostly ClearPartly Cloudy
July 2266°F19°C79°F26°C15 mph25 km/h from NorthWindyMostly Clear
July 2364°F18°C85°F29°C13 mph21 km/h from NorthClearClear

No

Low of 64°F18°C, High of 78°F26°C
Wind: 10 mph17 km/h
Precipitation: None

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