Yes

you do need a jacket based on the weather in Halifax, NS, Canada 1 second ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
49°F9°C & Drizzle

Wind is 6 mph9 km/h from the South, gusting to 9 mph15 km/h
May 8
1am49°F9°C6 mph9 km/h SouthRain
2am49°F9°C5 mph8 km/h SouthDrizzle
3am48°F9°C5 mph8 km/h SouthRain
4am48°F9°C5 mph9 km/h SouthDrizzle
5am48°F9°C6 mph10 km/h SouthCloudy
6am49°F9°C6 mph9 km/h SouthwestFoggy
7am50°F10°C6 mph9 km/h SouthwestFoggy
8am51°F11°C6 mph9 km/h SouthwestHaze
9am53°F12°C7 mph11 km/h SouthwestHaze
10am55°F13°C7 mph11 km/h SouthwestMostly Cloudy
11am57°F14°C8 mph12 km/h SouthwestMostly Cloudy
12pm59°F15°C7 mph12 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
May 747°F8°C61°F16°C7 mph11 km/h from SouthwestMostly CloudyCloudy
May 845°F7°C62°F17°C7 mph11 km/h from NortheastCloudyCloudy
May 945°F7°C52°F11°C9 mph14 km/h from SoutheastRainDrizzle
May 1044°F7°C59°F15°C12 mph19 km/h from NorthwestMostly CloudyMostly Clear
May 1139°F4°C60°F15°C9 mph14 km/h from WestPartly CloudyPartly Cloudy
May 1246°F8°C65°F19°C5 mph9 km/h from WestPartly CloudyPartly Cloudy
May 1348°F9°C64°F18°C9 mph14 km/h from SouthwestMostly CloudyCloudy

Yes

Low of 46°F8°C, High of 63°F17°C
Wind: 7 mph11 km/h
Precipitation: 19% rain

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