Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's really really huffing out there!
51°F11°C & Windy

Wind is 16 mph25 km/h from the West, gusting to 32 mph52 km/h
May 25
12am51°F11°C15 mph25 km/h WestWindy
1am51°F10°C14 mph23 km/h WestMostly Clear
2am51°F11°C14 mph23 km/h WestMostly Clear
3am52°F11°C16 mph26 km/h WestWindy
4am54°F12°C17 mph27 km/h WestWindy
5am55°F13°C17 mph28 km/h WestWindy
6am57°F14°C18 mph28 km/h WestWindy
7am58°F14°C17 mph28 km/h WestWindy
8am57°F14°C17 mph27 km/h WestDrizzle
9am57°F14°C19 mph30 km/h WestDrizzle
10am59°F15°C18 mph29 km/h WestWindy
11am58°F15°C20 mph33 km/h WestWindy
DateLowHighWindDayNight
May 2450°F10°C59°F15°C18 mph29 km/h from WestDrizzlePartly Cloudy
May 2548°F9°C59°F15°C15 mph24 km/h from SouthwestRainRain
May 2649°F10°C64°F18°C10 mph17 km/h from SouthwestRainDrizzle
May 2751°F11°C61°F16°C13 mph21 km/h from WestMostly CloudyRain
May 2851°F11°C65°F18°C14 mph23 km/h from WestDrizzleMostly Cloudy
May 2953°F12°C69°F21°C10 mph17 km/h from SouthwestDrizzleMostly Cloudy
May 3053°F12°C66°F19°C10 mph16 km/h from SouthwestDrizzleMostly Clear

Yes

Low of 48°F9°C, High of 59°F15°C
Wind: 15 mph24 km/h
Precipitation: 68% rain

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