Yes

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

Why? Because there's a refreshing nip in the air.
50°F10°C & Cloudy

Wind is 2 mph4 km/h from the NW, gusting to 10 mph16 km/h
May 3
2am50°F10°C3 mph5 km/h NWCloudy
3am50°F10°C4 mph6 km/h NWCloudy
4am52°F11°C4 mph6 km/h NWCloudy
5am53°F12°C4 mph7 km/h NWCloudy
6am54°F12°C4 mph7 km/h NWCloudy
7am56°F13°C4 mph6 km/h NWCloudy
8am57°F14°C4 mph6 km/h NWCloudy
9am58°F15°C3 mph5 km/h NWCloudy
10am59°F15°C2 mph4 km/h NWDrizzle
11am59°F15°C2 mph4 km/h WCloudy
12pm59°F15°C4 mph6 km/h SWCloudy
1pm58°F14°C6 mph10 km/h SWCloudy
DateLowHighWindDayNight
May 250°F10°C59°F15°C4 mph6 km/h from NWDrizzleCloudy
May 349°F9°C56°F13°C9 mph15 km/h from WCloudyDrizzle
May 448°F9°C58°F15°C6 mph10 km/h from WDrizzleDrizzle
May 549°F9°C61°F16°C8 mph13 km/h from NWMostly CloudyMostly Cloudy
May 646°F8°C62°F17°C5 mph8 km/h from NCloudyMostly Cloudy
May 748°F9°C62°F17°C5 mph9 km/h from SECloudyMostly Cloudy
May 849°F9°C66°F19°C3 mph5 km/h from SMostly CloudyMostly Cloudy

Yes

Low of 49°F10°C, High of 56°F14°C
Wind: 9 mph15 km/h
Precipitation: 55% rain

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