Yes

you do need a jacket based on the weather in Reykjavík, Iceland 1 second ago

Why? Because a jacket will keep you cozy, but you won't break a seat!
57°F14°C & Cloudy

Wind is 12 mph19 km/h from the East, gusting to 13 mph21 km/h
September 11
10am58°F14°C12 mph19 km/h EastDrizzle
11am59°F15°C11 mph18 km/h EastMostly Cloudy
12pm59°F15°C9 mph15 km/h EastMostly Cloudy
1pm59°F15°C8 mph13 km/h EastMostly Cloudy
2pm58°F15°C6 mph10 km/h EastMostly Cloudy
3pm57°F14°C4 mph7 km/h EastMostly Cloudy
4pm56°F13°C4 mph7 km/h NortheastCloudy
5pm54°F12°C4 mph6 km/h NortheastMostly Cloudy
6pm53°F12°C4 mph6 km/h NortheastMostly Cloudy
7pm52°F11°C4 mph6 km/h EastPartly Cloudy
8pm51°F11°C3 mph5 km/h EastMostly Clear
9pm50°F10°C3 mph5 km/h EastMostly Clear
DateLowHighWindDayNight
September 1051°F11°C59°F15°C11 mph18 km/h from EastDrizzlePartly Cloudy
September 1147°F8°C56°F14°C7 mph12 km/h from NortheastDrizzleDrizzle
September 1242°F6°C54°F12°C12 mph20 km/h from NortheastDrizzleDrizzle
September 1348°F9°C53°F12°C12 mph20 km/h from EastDrizzleDrizzle
September 1449°F9°C54°F12°C6 mph10 km/h from NortheastDrizzleDrizzle
September 1547°F8°C54°F12°C8 mph12 km/h from EastDrizzleDrizzle
September 1646°F8°C52°F11°C9 mph14 km/h from EastDrizzleMostly Cloudy

Yes

Low of 47°F9°C, High of 56°F14°C
Wind: 7 mph12 km/h
Precipitation: 39% rain

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