Yes

you do need a jacket based on the weather in Dublin, Ireland 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter!
54°F12°C & Mostly Clear

Wind is 7 mph11 km/h from the Southwest, gusting to 16 mph26 km/h
September 7
10pm54°F12°C7 mph11 km/h SouthwestMostly Clear
11pm53°F12°C7 mph12 km/h SouthwestMostly Clear
September 8
12am52°F11°C7 mph12 km/h SouthwestMostly Clear
1am52°F11°C6 mph10 km/h SouthwestMostly Clear
2am52°F11°C7 mph11 km/h SouthwestClear
3am54°F12°C7 mph11 km/h SouthwestClear
4am56°F13°C7 mph11 km/h SouthwestClear
5am58°F15°C7 mph12 km/h SouthwestClear
6am60°F16°C9 mph14 km/h SouthwestMostly Clear
7am61°F16°C9 mph15 km/h SouthwestPartly Cloudy
8am62°F17°C10 mph16 km/h SouthwestMostly Cloudy
9am63°F17°C10 mph16 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 752°F11°C64°F18°C8 mph13 km/h from SouthwestDrizzleMostly Cloudy
September 854°F12°C63°F17°C14 mph22 km/h from SoutheastDrizzleRain
September 953°F12°C63°F17°C9 mph14 km/h from SouthwestDrizzleDrizzle
September 1051°F11°C60°F15°C16 mph25 km/h from SouthwestDrizzlePartly Cloudy
September 1150°F10°C61°F16°C15 mph24 km/h from WestDrizzleDrizzle
September 1250°F10°C61°F16°C13 mph21 km/h from SouthwestDrizzleDrizzle
September 1354°F12°C64°F18°C15 mph24 km/h from SouthwestDrizzleDrizzle

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 14 mph22 km/h
Precipitation: 44% rain

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