Yes

you do need a jacket based on the weather in Cantabria, Spain 1 second ago

Why? Because it's not very warm out!
52°F11°C & Partly Cloudy

Wind is 1 mph2 km/h from the South, gusting to 4 mph7 km/h
September 9
4am54°F12°C1 mph2 km/h SouthPartly Cloudy
5am56°F13°C1 mph2 km/h NorthwestPartly Cloudy
6am58°F14°C2 mph3 km/h NorthMostly Cloudy
7am59°F15°C3 mph5 km/h NortheastCloudy
8am61°F16°C4 mph6 km/h NorthMostly Cloudy
9am62°F17°C5 mph7 km/h NorthPartly Cloudy
10am63°F17°C5 mph9 km/h NorthPartly Cloudy
11am62°F16°C5 mph8 km/h NorthMostly Cloudy
12pm61°F16°C5 mph7 km/h NorthMostly Cloudy
1pm60°F16°C2 mph4 km/h NortheastMostly Cloudy
2pm60°F15°C1 mph2 km/h NorthMostly Cloudy
3pm58°F14°C1 mph2 km/h EastMostly Cloudy
DateLowHighWindDayNight
September 849°F10°C63°F17°C3 mph5 km/h from NorthMostly CloudyMostly Cloudy
September 953°F12°C66°F19°C4 mph7 km/h from WestDrizzleDrizzle
September 1055°F13°C68°F20°C4 mph6 km/h from NorthMostly CloudyDrizzle
September 1155°F13°C63°F17°C4 mph6 km/h from NorthDrizzleCloudy
September 1252°F11°C66°F19°C3 mph4 km/h from NorthMostly CloudyPartly Cloudy
September 1356°F13°C75°F24°C3 mph6 km/h from EastClearPartly Cloudy
September 1458°F15°C71°F22°C4 mph7 km/h from NorthMostly CloudyCloudy

Yes

Low of 53°F12°C, High of 65°F19°C
Wind: 4 mph7 km/h
Precipitation: 41% rain

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