Yes

you do need a jacket based on the weather in Tallaght (Tallaght), County Dublin, Ireland 9 minutes ago

Why? Because too cold for just a hoodie, too warm for a parka and there are strong winds blowing out there!
49°F9°C & Mostly Cloudy

Wind is 13 mph21 km/h from the Southwest, gusting to 27 mph44 km/h
September 13
12am49°F9°C14 mph22 km/h SouthwestCloudy
1am49°F9°C15 mph24 km/h SouthwestCloudy
2am49°F10°C14 mph23 km/h SouthwestCloudy
3am50°F10°C15 mph24 km/h SouthwestCloudy
4am51°F11°C16 mph25 km/h SouthwestDrizzle
5am53°F12°C17 mph28 km/h SouthwestWindy
6am54°F12°C18 mph28 km/h SouthwestWindy
7am56°F13°C18 mph29 km/h SouthwestWindy
8am57°F14°C17 mph27 km/h WestWindy
9am58°F14°C18 mph29 km/h WestDrizzle
10am58°F15°C16 mph25 km/h WestDrizzle
11am59°F15°C16 mph26 km/h WestWindy
DateLowHighWindDayNight
September 1249°F9°C59°F15°C16 mph26 km/h from SouthwestDrizzlePartly Cloudy
September 1350°F10°C65°F19°C16 mph26 km/h from SouthRainDrizzle
September 1452°F11°C59°F15°C23 mph38 km/h from WestDrizzleWindy
September 1550°F10°C60°F15°C13 mph20 km/h from WestRainRain
September 1654°F12°C64°F18°C18 mph29 km/h from WestDrizzlePartly Cloudy
September 1751°F10°C62°F16°C8 mph13 km/h from WestMostly CloudyMostly Cloudy
September 1852°F11°C64°F18°C11 mph18 km/h from SouthRainDrizzle

Yes

Low of 50°F10°C, High of 65°F19°C
Wind: 16 mph26 km/h
Precipitation: 82% rain

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