Yes

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

Why? Because the air feels like the cozy middle ground between summer and winter!
59°F15°C & Mostly Cloudy

Wind is 7 mph12 km/h from the Northwest, gusting to 17 mph27 km/h
April 25
5am59°F15°C8 mph13 km/h NorthwestMostly Cloudy
6am61°F16°C9 mph14 km/h NorthwestMostly Cloudy
7am62°F17°C9 mph15 km/h NorthwestMostly Cloudy
8am63°F17°C11 mph17 km/h NorthwestPartly Cloudy
9am64°F18°C12 mph19 km/h NorthwestPartly Cloudy
10am65°F18°C12 mph19 km/h NorthwestMostly Clear
11am64°F18°C13 mph21 km/h NorthwestPartly Cloudy
12pm64°F18°C13 mph21 km/h NorthwestPartly Cloudy
1pm62°F17°C13 mph21 km/h NorthwestPartly Cloudy
2pm61°F16°C13 mph21 km/h NorthwestPartly Cloudy
3pm60°F15°C13 mph20 km/h NorthwestPartly Cloudy
4pm59°F15°C12 mph19 km/h NorthwestMostly Clear
DateLowHighWindDayNight
April 2456°F13°C65°F18°C10 mph16 km/h from NorthwestPartly CloudyMostly Clear
April 2551°F11°C68°F20°C10 mph17 km/h from NorthClearMostly Clear
April 2651°F11°C74°F23°C5 mph9 km/h from NortheastPartly CloudyMostly Clear
April 2756°F13°C76°F25°C6 mph9 km/h from SoutheastPartly CloudyMostly Cloudy
April 2857°F14°C74°F24°C5 mph8 km/h from SouthwestPartly CloudyMostly Cloudy
April 2952°F11°C65°F19°C5 mph8 km/h from WestRainRain
April 3049°F10°C63°F17°C8 mph12 km/h from SouthPartly CloudyMostly Cloudy

Yes

Low of 51°F11°C, High of 68°F20°C
Wind: 10 mph17 km/h
Precipitation: None

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